How to Plug Weld

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Plug welding is an alternative technique to spot welding where overlapping metal plates are joined together by a series of small circular welds. This method commonly is used in automobile manufacturing and restoration, where spaces are too small to fit a spot welding machine's electrodes. Instead, a metal inert gas (MIG) welding torch is used to weld in a hole drilled into the top plate to melt the lower plate and fill the hole with filler metal to create a plug.

Things You'll Need

  • Sheet metal
  • Drill fitted with a 7.5 mm bit
  • MIG welding machine
  • Clamps
  • Drill holes every 1/4 to 1/2 inch along the width of the top metal plate that you are welding with a drill fitted with a 7.5 mm drill bit.

  • Place the top piece of sheet metal over top the base piece of metal and clamp it in place so it does not move while you are working.

  • Place the wire electrode from the MIG welding torch in the center of the first hole so it touches the lower metal plate.

  • Pull the torch trigger to start an arc weld for 4 to 6 seconds until the hole in the top sheet fills with liquid metal. This will fill the hole with a plug and join the two sheets together at that location.

  • Repeat step 4 until all the holes are welded.

Tips & Warnings

  • Always wear protective gloves and a welder's mask when welding.
  • Do not weld near combustible materials.
  • Always weld in an area with good ventilation.

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References

  • Photo Credit Digital Vision./Digital Vision/Getty Images
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