How Does Sub Arc Welding Work?

If you’re curious about how sub arc welding works, you’ve come to the right place. This welding process uses electrically-cold filler wire to improve the weld metal’s properties. This filler wire can either be solid or flux-cored. If it’s solid, it can introduce certain special alloys into the weld area. Flux-cored electrodes are special wires that have to undergo special engineering.

What is ultrasonic welding process?

Ultrasonic welding is a fast, clean, and automated process that delivers a quality welding joint. It does not require filler metals, adhesives, or mechanical fasteners. It can be used for a variety of projects, including manufacturing plastic and metal parts. In addition, the process is safe and does not require special ventilation.

The process starts with a high-frequency electrical current flowing through a piezoelectric transducer. The piezoelectric transducer converts this electrical signal into mechanical vibration. A booster then amplifies this vibration and sends it through a horn in contact with the welding plate.

Ultrasonic welding is commonly used in electronics, medical and automotive industries. It can weld dissimilar metals. However, it is important to note that this process can be loud, so operators should always wear ear protection. In addition to joining metals, ultrasonic welding is also used to join thermoplastic parts. Moreover, it is ideal for fusing thin sheet metals, foils, wires, and meshes.

To start an ultrasonic welding process, the machine must have a welding horn. This horn transmits ultrasonic energy to the workpiece and also provides mechanical gain for the ultrasonic machine. Welding horns are usually made of titanium or aluminum. However, aluminum horns are only suitable for low-volume applications. The reason is that aluminum can result in distortion of the welds. To counter this, most horns have hardened tips.

What is ultrasoWhat is sub arcnic welding process?

Ultrasonic welding is a process that uses high frequency vibrations to join metals. It can weld dissimilar metals in a shorter time and without the need for fuel. It is also safer than conventional welding methods. This process can be performed on different types of materials, including plastics, metals, and tubes.

In this welding process, ultrasonic energy is transferred to the metal or other component through a welding horn tip. The tip is profiled to fit the component, ensuring maximum energy transfer. The component is held firmly in place by support tooling on the machine press base. The support tooling is designed to prevent the lower component from moving during the welding process.

The ultrasonic waveform is generated by mechanical transducers, which are either piezoelectric or magnetostrictive. The ultrasonic pulses are induced in an arc through ultrasonic excitation of current. The resulting weld is a durable and strong metal bond, which can be used for multiple applications. Ultrasound technology is becoming more common in many industries, including construction and manufacturing.

What is co2 welding process?

CO2 welding process is a semi-automatic process that uses CO2 gas for shielding the molten pool and conducting the arc. As opposed to MIG welding, which uses a bare metal electrode to generate heat, CO2 welding uses a coated electrode and a source of compressed air to provide the heat necessary to conduct the arc.

CO2 welding is best suited for thicker metal sheets. It is also better for reducing spatter, rust, and mill scale. However, CO2 cannot be used for welding thin materials, as the arc will not remain stable. It can be a good process to use for fillet and butt welds.

CO2 welding can be used for a variety of applications. It is often used for metal fabrication. It can be used to join various types of metal. CO2 welding is a great option for fusing stainless steel and other metals. It is also a good option if you need a high level of weld penetration.

To start using CO2 welding, you’ll need a machine and a wire feeder. You’ll also need a shielding gas and welding wire. Once these are in place, you’re ready to start welding.

Is submerged arc welding done underwater?

Submerged arc welding is a unique process where the electrodes are fed into an underwater arc. The arc is maintained with an automatic system. Submerged arc welding results in uniform, consistent welds, despite the fact that the process occurs under water. A submerged arc can produce a complete root penetration, but it is important to use high current and an electrode with a positive charge.

The process involves the use of special flux mixed water glass, which stabilizes the arc and protects the weld joint from the surrounding water. This method has been developed and tested on steel structures up to 9mm in thickness. It has been proven to be a reliable way to weld, and it can be put to practical use. The weld metal produced by submerged arc welding is very soft, so it’s easier to cut.

Submerged arc welding is a method that allows for weld metals to have eighty percent of the strength of the base metal. The cooling rate for this process at 500degC is 23degC/sec, compared to 10degC/sec for a similar arc in air. This is a major advantage of underwater welding compared to air welding.

What are the disadvantages of Submerged Arc Welding

Submerged arc welding is a fast, easy way to produce strong welds that require minimal manpower. The process produces very smooth, uniform welds with little or no spatter and very little arc flash. It is also easily automated and does not require specialized skills.

Some of the advantages of sub arc welding include increased deposition rates and increased travel speed. However, there are some drawbacks. For one, this process cannot be used in all positions, including inside of pressure vessels and other structures. Those positions where traditional welding processes cannot be used are inaccessible to submerged arc welding.

One of the disadvantages of submerged arc welding is that it cannot be used on materials that are more than 12 mm thick. Secondly, the operator cannot see how the welding process is progressing. This makes it important to have the right accessories for gauging the progress of the process and ensuring that the joint is fully welded.

Another disadvantage is the need for accurate edge preparation and fit up on the joint. The weld will be poorly shaped without it. The flux may also cause the workpiece to burn. Also, there is the potential for contamination and weld porosity. The weld metal chemistry is difficult to control and alloyed fluxes can alter the composition of the weld metal. Lastly, the arc’s location must be protected from atmospheric air, which can cause oxidation. In addition, the temperature of the arc can reach up to 6300deg F, which is more than enough to melt steel.

Is Submerged Arc Welding automatic?

The process of submerged arc welding involves welding a joint using an arc. The arc heats the base metal and the wire. The molten weld metal melts, forming a slag-covered weld bead. The slag is recovered by a chipping hammer. This process is faster and stronger than other methods of welding.

Submerged arc welding is an efficient welding process for many applications. It has high thermal efficiency and minimal heat loss. It also does not require fume extraction or spatter. This makes it a perfect solution for large-scale structural steel manufacturing. It is possible to use submerged arc welding in an automated process or manually.

Submerged arc welding is most efficient for thick metal plates. It can weld larger parts and can also be automated using industrial robots. The process is most commonly used in the heavy metal industry, railroads, wind turbines, and in construction. It works best with metal plates that are two to 100 mm thick. Its automation provides a fabricator with distinctive advantages, such as increased capacity and productivity.

Automatic submerged arc welding has three basic types of guns. One type is a fixed gun that deposits flux around the wire as it melts. Another type of gun is a deep groove gun. The deep grooved gun feeds flux into the weld pool from a hopper overhead.

Originally published at xpressmobilewelding.com

What Electrodes to Use in Arc Welding

When it comes to arc welding, there are 4 types of electrodes. These electrodes differ based on their properties. The basic guideline is to use an electrode that matches the base metal’s strength properties. However, you should also consider the type of base metal you’ll be welding, as these can also influence the type of stick electrode you need.

Which type of electrode is used in arc welding?

In arc welding, there are two types of electrodes: bare electrodes and light coated electrodes. Bare electrodes are made of bare metal, while light coated electrodes are made of metal coated with lime. Both types have the same overall diameter and length, but the difference between the two is in the coating. Light coated electrodes tend to be more stable, and the coating provides better protection from oxidation of the weld. They also produce a quieter arc.

The type of electrode you choose will depend on the type of welding you plan to do. The American Welding Society developed a system for naming electrodes. The electrode classification number consists of letters and numbers, and is usually engraved on the side of the welding rod. In the U.S., the first digit stands for electrode, and the two digits after the electrode indicate the minimum tensile strength of the weld.

The most popular electrode type is the 6010, which is designed to deliver deep penetration. It is used primarily for welding pipe and steel castings. This type can also be used for welding metals up to 1/2 in thick. However, it is important to note that 6010 electrodes can only be used with direct current (DC) welding equipment.

How do I choose an electrode for arc welding?

There are several types of electrodes to choose from. They differ in their mechanical properties and the way they operate with a particular welding power source. You should choose the correct electrode based on your base metal, joint fit-up, and welding positions. To make your welding process more efficient, you should know the basic types of electrodes.

If you are welding mild steel, you should use electrodes beginning with E60 and E70. The type of weld and the depth of penetration will also determine the type of electrode to use. If the weld will span a wide gap, you can use an E6013 electrode. If you are welding larger pieces, you should use an electrode with higher voltage.

Another factor that determines the type of electrode to use is the current. Using too little current can cause the arc to be unstable and difficult to start. Additionally, a low current will cause the electrode to stick to the work piece. Similarly, too high a current will overheat the electrode and can cause undercutting or burning of the material. An optimum current is somewhere in the middle of these ranges. This will ensure that the electrode isn’t overheated or burns the work.

Arc welding electrodes come with a variety of coatings. They can be thin or thick, or a combination of both. Whether you use an E6010 or E7024 electrode, the right coating will make your welding experience easier and ensure a stronger weld.

What are the 4 types of electrodes?

Electrodes are used in arc welding to create an electric arc. They are thin metal wires of different diameters and lengths. The most common electrodes used in MIG welding are spools of wire, while the electrodes used in SMAW and TIG welding resemble long wire rods. There are several types of electrodes, and some are specifically designed for different metals and currents.

The first type is bare electrodes, which are used in applications that do not require coated electrodes. The second type is a coated electrode. The coating of an electrode depends on its coating factor. The coating factor is a ratio of the diameter of the electrode to its core wire. The coating helps remove impurities from the arc. Light coatings help remove oxides and phosphorous from the arc, while medium coatings increase arc stability.

Tungsten electrodes are the most common type of electrodes. While they are commonly used in welding, they are less efficient than thorium electrodes. In addition, thoriated electrodes are more resistant to contamination. Pure tungsten electrodes are best for welding thin metals, but can be less effective on heavy metal. Tungsten-thorium electrodes have high current-carrying capacity and can withstand higher voltages. They also have better arc control.

How do I know which electrode to use?

Before using an electrode, you should know its composition and the type of power source it is compatible with. Some electrodes are only compatible with AC power while others require DC power. You can identify the type of electrode by its fourth digit on the AWS classification. The fourth digit indicates the type of electrode coating and welding current compatibility.

The tensile strength of the welded piece depends on the type of electrode. For example, a rod with an E symbol indicates it can handle 60,000 pounds of tensile strength per square inch, while an electrode with a 70 symbol means it can handle 70,000 pounds. Another indicator of a quality electrode is its sound. It should produce a sharp crackling sound with each movement. You can also judge the weld bead’s appearance.

The thickness of a part is another consideration. If the part is only a few millimeters thick, you should use a rod that is a little larger than the metal. For example, if you’re welding a two-millimeter thick plate, you should use an electrode with a diameter of 2.5 millimeters. The diameter of the electrode also depends on the material to be welded. The current setting of the electrodes varies according to the metal or alloy being welded. In some applications, a higher amperage will yield a stronger weld joint, but a lower one will make the joint weaker.

How do you choose electrode size?

When choosing an electrode size in arc welding, you will need to consider the thickness of the part to be welded. If the part is thin, you’ll want to choose an electrode with a diameter that is slightly larger than the thickness of the metal. For example, an electrode for a two-millimeter-thick plate should be 2.5 millimeters wide. The recommended sizes for electrodes are listed in the table below. These recommendations will vary according to the thickness of the part and the type of metal/alloy to be welded. It’s also important to know the recommended current setting for the metal/alloy you are welding. Often, manufacturers will specify a range of current for their electrodes. When welding with an over-head process, the current setting should be slightly lower than what is recommended for normal welding.

The next consideration is the electrode’s classification. Some types of electrodes are only suitable for AC power sources, while others are only suitable for DC power sources. The AS/NZS classification is helpful in determining the type of current an electrode is compatible with.

What is the easiest arc welding rod to use?

There are a few different types of arc welding rods. Some are easier to use than others, and some are more complicated. The easiest type of rod is one with a diameter of 1/8” or larger. These rods have good tip stability, but they can also produce a large amount of spatter. Thinner rods can be harder to weld with because they shake too much at the tip and make it difficult to strike the arc. Another type of rod is the cellulosic variety, which are harder to weld with because of their high heat and spatter. They also take a lot more time to learn to use and are not compatible with most welding machines.

Another type of rod is E6013. E6013 is one of the easiest to use because it produces a smooth arc and is easier to handle. It also produces less slag than other types of rod. It is also easier to start and stop than other types of rods, which makes it ideal for novice welders. E6013 is also very popular among welders because it is inexpensive and easy to find.

Another type of electrode is E7018. This electrode is commonly used in powerhouses, energy power plants, bridges, and factories. It has a high iron content, making it easy to weld. However, it must not be exposed to moisture. The best way to keep it dry is by storing it in a rod oven. E7018 is also the easiest arc welding rod to use.

Originally published at xpressmobilewelding.com

What Gas is Used For Mig Welding Steel?

When mig welding steel, the gas that you use is important. The shielding gas is used to keep the weld clean. Some steels do not require the use of shielding gas when they are welded with flux-cored wire. There are several different types of gas mixes and all of them do slightly different things. The right gas mix for you will depend on the thickness of your workpiece and the type of metal you are welding.

What gas is best for MIG welding steel?

MIG welding uses several gases, including argon and helium. While these two gases are the most commonly used, others may have similar properties and produce similar results. It is essential to understand how these gases affect the welding process and choose the right one. Shielding gases, for example, set the atmosphere for the weld and protect the workpiece from contamination.

Pure Argon is not inert, but it provides some protection against the heat created by the arc. It is best used in a mixture with other shielding gases. Pure CO2 is cheaper than Argon, but it can create a harsher arc and increase the possibility of spattering.

Choosing the right gas for MIG welding is critical to a quality weld. Gases vary in cost and rate and you should study your budget before deciding on a specific gas. Choosing the right gas for your job will ensure a reliable bead pattern and minimize heat generation. If you’re not sure, contact the manufacturer of your welder for more information.

MIG welding uses a shielding gas, which helps keep the weld clean and minimize weld spatter. Most metals respond well to a 75/25 mix of argon and carbon dioxide. However, some metals require more argon than others. A general rule of thumb is that argon/CO2 mixtures are best for welding steel.

Can you mig weld steel with 100 argon?

Argon is a gas that has a low ionization potential, limiting its ability to generate an arc and therefore, decrease the power of the welding arc. As a result, the arc tends to be weaker, resulting in weaker weld beads and poor bead contours. Pure argon also decreases the ductility of the welded joint, making it susceptible to cracking and breaking. Hence, it is not advisable to use argon during MIG welding.

The use of 100% argon to MIG weld mild steel is only recommended as a last resort. In addition to producing weaker and brittle weld joints, it also reduces the thermal conductivity of the metal. Furthermore, it creates a small, narrow cavity in the metal, which is susceptible to breakage. It is also prone to spatter.

The main disadvantage of 100% argon to MIG weld steel is that it causes spatter and has a lower penetration depth than 75/25. In addition, 100% argon welding is ineffective for welding thicker metals. To avoid such problems, you can use an appropriate argon line system. A pressure regulator should be installed on the argon line. This regulator will help you reduce the flow rate to 15-30 psi.

What gas is used for steel welding?

When welders are performing MIG welding on steel, the gas used is usually argon-carbon dioxide. This mix contains about 50 percent argon and the other half is carbon dioxide. This gas is known as a shielding gas and is essential to the welding process. It will help prevent overheating and produce a consistent beat pattern. A good way to choose the right gas for your job is to refer to the manufacturer’s recommendations.

Helium is the most expensive gas and requires a higher flow rate than argon. The added cost of helium should be weighed against the increase in productivity. Helium is often used in combination with argon and carbon dioxide. Both gases have their advantages and disadvantages, but the gas used should be appropriate for the welding process.

While Argon is the most common gas used for MIG welding, you can use other types of shielding gas as well. Argon is inexpensive and readily available. It has the lowest thermal conductivity of any shielding gas and helps make the weld pool less spattery. Helium, on the other hand, allows for better penetration and a more fluid weld pool. In addition to argon, other gases like carbon dioxide and hydrogen are also used for MIG welding.

Can I use argon for MIG welding steel?

Pure Argon is not suitable for welding stainless steel. However, you can use argon mixed with CO2 for the weld. The downside to pure Argon is that it is not cheap. Using it for welding does not give you the desired weld result. Also, you should be careful with it, as it can be harmful to the weld. Here are some things to remember when using pure Argon.

Carbon Dioxide is not a noble gas like Argon, and thus it can cause damage to the welding steel frame if used alone. However, carbon dioxide can be used with Argon in an appropriate ratio for delicate projects. Carbon Dioxide helps the arc penetrate deeper into the welding material, which results in a stronger bead. However, it can also create a lot of spatter and smoke.

It can also be used to make multiple passes. However, it is not as economical as helium, which is more expensive. In addition, argon can give better protection from oxidation. Helium is also less useful for welding nickel alloys because it can cause micro-pitting and porosity, while argon can provide a better weld. It is possible to mix argon and helium for better results.

How much does argon gas cost?

If you’re considering mig welding, you may be wondering how much argon gas costs. There are several ways to obtain shielding gas, but the most expensive method is by purchasing disposable tanks. However, refilling these tanks is cheaper than purchasing a new one. You can purchase a 60-cf refillable cylinder for as little as $60 and save as much as $300 over the years.

You can find a gas recommendation guide from your welding wire manufacturer. Usually, they will have guidelines that indicate the best gas for a particular project. In addition, the manufacturer of your welding equipment will usually provide a guide detailing the recommended gas and electrode combinations for your project.

Alternatively, you can choose a mix that combines 2% Argon and 75 percent CO2. The ratio of these two gases can vary, but both provide a smooth weld and reduce spatter. Some of the more common mixes are C25 (75% Ar, 25% CO2), and trimix 72/25/3 Ar/CO2/He.

The amount of gas required for a typical MIG weld can range from 25 to 30 cubic feet per hour (CFH), with larger cylinders requiring higher flow rates. The amount of gas used depends on the type of welding machine and the working environment. If the work area is windy, a higher flow rate is recommended to prevent air bubbles. Even a slight breeze can cause a weld to fail.

Is argon or CO2 better for MIG welding?

MIG welding steel requires the proper mixture of gases to achieve the desired results. A combination of argon and carbon dioxide gives a smoother output, a deeper penetration and just the right amount of heat for bending the steel. This combination makes the process of welding steel easier and more productive.

Helium is more expensive than argon, but it has certain benefits. It resists chemical reactions and produces a lower amount of weld spatter. It is often mixed with argon and CO2 to make welding more affordable. It is mostly used for non-ferrous metals, but it is also sometimes added to stainless steel to produce an arc that’s safer.

The decision to use argon or CO2 for welding depends on your welding process, the thickness of the steel, and your budget. For instance, argon-heavy gases are better for stainless steel welding and spray transfer welding. Argon-heavy gas is ideal for welding steel that’s thin, while helium-heavy gases are ideal for short circuits and spray transfer welding. The choice depends on your budget, but both gas types can perform equally well.

CO2 has several disadvantages over argon, but is cheaper and more durable. It is also easier to clean. Moreover, because of its lower oxygen content, CO2 has less porosity. Most alloy steels and metals can be welded with either gas.

Originally published at xpressmobilewelding.com

What Causes Pinholes in MIG Welding?

When you weld, you often encounter pinholes. If this happens to you, there are several things you can do to prevent them. For example, you can check for pinholes before you start inspecting the weld. If you find one during the process, you can try to solve the problem as soon as possible. The problem could be caused by any number of factors: contaminants in the workspace, an excessive amount of anti-splatter spray, or an out-of-gas situation.

How do you prevent pinholes from MIG welding?

Pinholes are a common problem for MIG welders. In addition to the weld itself, pinholes are a common symptom of outgassing, a phenomenon that occurs when trapped gases are released into the air during the welding process. This phenomenon happens every time the metal temperature reaches 100 degrees or higher. When the trapped gases expand to double their original volume during the curing process, they escape as pinholes. Although you can eliminate outgassing by preheating the workpiece before welding, sometimes it is impossible. If you cannot avoid this problem, you need to take a step back and reassess your procedure.

First, make sure that your welding gun is held at the correct angle and distance from the joint. The angle should be about 15 degrees. Using too much angle will reduce the gas coverage, as well as draw in more atmospheric gases. Second, make sure that the surface you are welding is clean and free from chemical defects. For example, rust, zinc plating, or other contaminants can cause pinholes in the weld.

In addition to gas contamination, pinholes can occur as a result of improper weld practices. Welding is a highly technical profession. Proper calculations are required to apply the right arc, angle, and duration. Welders also need to be careful about the welding environment, as dust and strong wind can affect the weld quality. Following these tips will help prevent pinholes and make your welding process a little more efficient.

Why am I getting holes in my MIG welds?

The first thing you need to do if you have holes in your MIG welds is to identify the cause. This may be a porosity or a wire that poked into the molten weld. A few simple tips will help you identify the cause of the holes and prevent them in the future.

Porosity is caused by the absorption of gas by the weld. There is not enough gas in the weld pool. This is usually caused by the wrong wire position, poor coverage of the weld pool, or an improper weld gun angle. It can also be caused by dirty base material or incorrect gas levels.

Gas leakage is another common cause of holes. In some cases, the gas canister will run out of gas. This will lead to a hole in the weld. A hole will allow the gas to leak through the weld. The gas will leak out of the hole, and air will enter the unprotected metal.

Keeping the wire 1/4 to 1/2 inch from the weld piece is a good rule of thumb. You can increase the distance slightly if the material is too thin. Make sure the wire feed speed is sufficient to avoid cold lap.

How do you stop blowing holes when welding?

One of the most common welding problems is blowing holes. These openings can be as small as a pinhole, but they can be so deep that they can ruin an otherwise perfect weld. The most common reason that pores appear in welds is a buildup of gases. These gases are released by the welding gun and are absorbed by the molten metal. Additionally, atmospheric air can also affect the weld, causing holes and pores to appear.

Another common reason why you may experience blowing holes is if your arc is too fast. When this happens, the arc will melt the metal too quickly. To fix this, simply pop the trigger. This will force the molten metal to solidify and fill the hole. Remember that the arc forms very quickly because the metal is so hot and has no time to cool down.

Blowing holes in mig welding is caused by an aggressive weld. This means that the mig wire is not able to penetrate the metal completely. In order to fix this problem, welders should understand how the wire operates. They must understand the voltage and current that their machine uses. Once they understand these, they can adjust their welding process.

What should gas pressure be for MIG welding?

When welding with MIG welders, it is important to know what gas pressure you should use. Too much gas can cause the weld to cool too quickly, while too little can allow contaminants to enter. Experiment with different gas pressure settings to determine what works best for your welder. In general, you should keep the gas pressure between 20 and 30 cubic feet per square inch. This setting is appropriate for most types of metals.

For thin metals, higher gas pressures can cause spatter and burn-through. It is important to remember that you should never use high gas pressures on thin metals. You should always check the gas pressure before starting a project to avoid burn-through and spatter.

Gas pressures can also affect the weld quality. Poor gas pressure will result in ugly welds, brittle welds, and even porosity. The gas pressure required varies depending on the type of metal and the welding position. For mild steel, a gas pressure of ten to fifteen cubic feet per minute is sufficient. However, if you need to weld thicker metal, you should use a gas pressure of twenty-five to thirty cubic feet per hour.

Aside from setting the gas pressure, another important factor in welding is the gas flow rate. In MIG welding, the gas flow rate will dictate the thickness of the weld bead. This is different from Oxyacetylene welding, which uses pressures to control gas flow. For MIG welding, the gas flow rate is much lower. If it is too low, the gas flow rate will restrict and create spatter build-up.

What is the remedy for porosity?

There are a few things you can do to prevent pinholes. First, you need to ensure that you are using the correct shielding gas. Porosity is usually caused by an insufficient amount of shielding gas. Another cause is a dirty base metal. You should also avoid extending your welding wire too far beyond the nozzle. Also, make sure you are using the correct nozzle size and that the gas coverage is adequate. Another remedy is to ensure that your welding process is as contaminate-free as possible.

When the weld is too thin or if the weld pool is too brittle, the gas will leak through and create pinholes. These pinholes will weaken the welded joint and may even cause breakage. The best way to fix this issue is to rework the joint and follow an agreed welding procedure.

The first thing you need to do is ensure the electrodes are clean and free of contaminants. If you don’t do this, the weld metal will develop porosity. The excess oxygen from the weld metal tends to form carbon monoxide. A lack of deoxidation is another cause of porosity. Make sure your electrodes are properly deoxidant to prevent the metal from reacting with oxygen.

What is the best way to avoid porosity?

Pinholes are small holes in a weld puddle that appear after welding. They can be as deep as the weld and ruin an otherwise perfect weld. The main reason for pinholes is the presence of impurities in the weld puddle caused by the gases released by the welding gun. This contaminated air is absorbed by the molten metal and causes holes to appear. Although there are dozens of reasons for pinholes in a weld, there are a few basic ways to avoid these defects in your weld.

The best way to avoid pin holes is to make sure that the parent metal is clean and free of any contaminants. This is especially important for materials that have surface coatings, such as galvanized steel. In some cases, this can be accomplished by grinding off the zinc coating, but some applications do not permit this step. Another way to avoid pin holes is to use FCAW-SS or SMAW, both of which use shielded wire.

Another way to avoid pin holes is to use a gas mask and to make sure that the weld has been blasted by aluminum oxide before the welding process. If this happens, the weld will not cut through the aluminum oxide layer, causing the filler material to mix with the partially melted aluminum oxide. Another way to prevent pin holes is to use a balance control on your weld. This control will allow you to tailor the balance of electrode positive and negative.

Originally published at xpressmobilewelding.com