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Welding then forming 409SS problems

Welding then forming 409SS problems

Welding then forming 409SS problems


                    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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