When welding thin sheets the forehand welding method is preferred.
How to seam copper sheets.
For sheets up to 1 8 in.
This video describes how to make a double lock standing seam with a seaming anvil and a hammer.
Tin edges and cleats to be soldered form seams and solder.
This type of seam is used wherever significant movement of the copper sheets is expected.
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Expansion and contraction are a function of temperature change material properties and the dimensions of the material.
Where lapped or bayonet type expansion provisions in work cannot be used or would not be sufficiently water weatherproof form expansion joints of intermeshing hooked flanges not less than 1.
6 4 mm or more.
3 2 mm thick a plain butt joint with squared edges is preferred.
It is arguably the most time proven type of roof panel seam.