Weld seam cracks after roll forming a flange.
Process: Rolling a cylindrical tank with 14 ga 409SS sheet and
using SAW for the butt weld seam. Filler is ER309LSI and flux is
ST-100. After the seam weld, a .4" deep flange (rough cross
section below) is roll formed on the top edge of the tank. The
weld is so brittle it cracks at the stressed corners. I am getting
mixed info on pre- and post-weld heating. One says to use low
heat input during welding and form at room temp without
annealing. Another expert suggested pre- and post-weld
treatment. If heat treatment is recommended, can heating with a
dull grinder be effective? Any other suggestions? It would be
nice if a ductile filler for 409 and 304 could be found. Thanks in
advance. SCOTT
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