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