Plug welding in copper
Plug welding in copper
(OP)
We are having trouble with plug welds cracking around the outside perimeter of the weld. It is roughly .75 deep. Is there a special procedure for welding a plug in copper which prevents cracking. These plug welds have to be pressure tight when completed.





RE: Plug welding in copper
RE: Plug welding in copper
RE: Plug welding in copper
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RE: Plug welding in copper
RE: Plug welding in copper
Nonsense. We have plug welded materials with no problems.
RE: Plug welding in copper
RE: Plug welding in copper
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RE: Plug welding in copper
RE: Plug welding in copper
RE: Plug welding in copper
...assuming "embritterment" should have been "embrittlement", the problem may be with your electrodes. Pure, oxygen-free copper, or fillers with deoxidants as noted may give better results. Having tried what you are doing in a previous life, the above "may"'s are almost "will"'s, but I bow to others with more knowledge of metallurgy.
I have also seen/heard about Cu welds with high porosity that were ultimately traced to high oxygen content in the argon purge/shield gas mix. You might check on that, though welding grade Argon is usually pretty low in O2.