The weld should be started again and continued until the seam weld is completed.
How to seam copper sheets.
3 2 mm thick a plain butt joint with squared edges is preferred.
6 4 mm or more.
When welding thin sheets the forehand welding method is preferred.
This video describes how to make a double lock standing seam with a seaming anvil and a hammer.
For sheets up to 1 8 in.
Fabricate nonmoving seams in copper sheet with flat lock seams.
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This type of seam is used wherever significant movement of the copper sheets is expected.
It is arguably the most time proven type of roof panel seam.
Expansion and contraction are a function of temperature change material properties and the dimensions of the material.