When welding thin sheet metal there is a product called Heat Fence it works really great too. You can get this product at any quality welding shop that handles all types of welding supplies. You put it along where you are going to weld and it draws off the heat from the weld. If you are Tig or Mig Welding the secret is to spot weld together and move around to different spots so the heat dissipates.
when you get it tacked all together make small welds 3/4" to 1" long them move to another spot and do the same thing.
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