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How Do I Weld a Copper Sheet?

Copper sheet can be successfully welded using a variety of processes. The best process for welding copper depends upon the thickness of the copper sheet, and to some extent upon the welding equipment available. Some welding processes (like pulsed arc welding) are more suitable to production environments, while others are available to small fabrication shops and even the home craftsperson.

Generally, welding copper sheet with a thickness of at least 1/16 inch can be accomplished using common MIG welding (GMAW) equipment. For joining thinner material, TIG welding (GTAW) is the preferred method. MIG welding is most common and requires less expertise.

Things You'll Need

  • MIG welder
  • Argon gas
  • Ecu welding wire
  • Acetone or other solvent
  • Clean rags
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Instructions

    • 1

      Prepare the joint. For copper sheets over 3/16 inch in thickness, bevel the edge before welding. For thinner material, a butt joint is appropriate.

    • 2

      Clean the weld area. Copper and copper alloys are extremely sensitive to any contamination on the surface of the metal being welded. Using fresh solvent and clean rags, thoroughly clean both pieces to be welded.

    • 3

      Weld the joint using a "push" type motion with the MIG gun, pushing the puddle ahead of the weld. Keep the gun's travel speed reasonably fast to prevent burn through.

      Differing combinations of copper alloys, welding equipment and welding electrodes will dictate the precise settings needed for your welder. For a starting setup, try 22 to 28 volts, 270 to 300 amps, and a wire speed of 180 to 200 inches per minute. Using 100 percent argon, set the flow rate to between 20 and 30 cubic feet per hour.

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