gilley29
Mechanical
- Jan 29, 2002
- 6
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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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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