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Q: MIG Welding / Copper Backing

874 views 8 replies 6 participants last post by  Fal"O" 
#1 ·
During the weld-up process for some torch cut receivers there is copper stock backing up the weld area.

Why is this so?
 
#8 ·
It acts as a heat-sink & as a fixture. The heat-sink is to assist the part being welded from warping & you can help this by not concentrating the weld in only one area. The fixture is used to hold the parts while welding, but, you don't want to weld the part to the fixture. You can also use graphite.
 
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