How to ARC Weld Sheet Metal
Arc welding is a process in which an electric current is passed from an electrode into sheet metal. The resulting heat is hot enough to melt and permanently fuse metal. Gas metal arc welding (GMAW), also known as metal inert gas (MIG) welding, is the most common arc welding process in use. The GMAW welding process requires the welder to use a cloud of inert shielding gas to surround the arc weld to prevent contamination from the air.
Things You'll Need
- MIG welding machine
- Welding wire
- Shielding gas
- Amperage chart
- Sheet metal
- Clamps
- Wire brush
- Gloves
- Welder's mask
Instructions
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Prepare your MIG welding machine by loading a spool of welding wire into the machine and attaching a tank of inert gas. As each welding machine has different loading procedures, you should consult the manufacturer's instructions.
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Adjust the amperage setting on your welding machine according to the thickness and type of metal you are welding. Welding manufacturers publish amperage charts for you to consult to determine the appropriate setting.
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Place the sheet metal into the configuration you intend to weld them and clamp the sheets in place. This will prevent your project from shifting during the welding process.
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4
Brush the edges of the sheet metal with a wire brush. This will remove any corrosion, paint or dirt from the metal.
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Hold the tip of the welding torch 1/8-inch from the seam between the metal sheets and press the torch's trigger. This will spark an electric arc to the metal and begin the arc welding process.
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Move the torch along the seam between the pieces of sheet metal in a slow circular pattern. The motion will aid in mixing the molten metals.
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Continue welding along the entire length of the seam. Release the torch trigger when you have completed the weld.
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Tips & Warnings
Always follow the manufacturer's instructions for your MIG welding machine.
Wear protective gloves and a welder's mask when welding.
Weld in a well-ventilated area.
Do not weld near flammable materials.
References
Resources
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