The backhand method is preferred for thicknesses of 1 4 in.
How to seam copper sheets.
For sheets up to 1 8 in.
Expansion and contraction are a function of temperature change material properties and the dimensions of the material.
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It is arguably the most time proven type of roof panel seam.
6 4 mm or more.
Fabricate nonmoving seams in copper sheet with flat lock seams.
When welding thin sheets the forehand welding method is preferred.
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.
3 2 mm thick a plain butt joint with squared edges is preferred.
The weld should be started again and continued until the seam weld is completed.