WE ARE FACING CRACK AFTER FORMING IN SEAM WELDING ZONE. I WANT TO KNOWN ALL THE THINGS WHICH RESULT TO CRACK. THANKING YOU

-- chandramohan (chelmcm@usa.net), November 29, 2000

Answers

This question indicates that there is a forming operation after the seam weld. However there are many questions to be answered before we can offer any reasonable advice. Such as: What is the material composition , mild steel? , stainless steel? , other? What is the thickness of the material? Is the weld made with the materials overlapped? If so how much overlap? What is the shape of the seam welding wheel? What are the seam welding parameters (electrode force / wheel travel speed / weld control settings)? Is the workpiece clamped both sides? If so how are they clamped? Are the wheels traveling over the work or is the work moving between wheels (in a fixed position)? Are you flood cooling? Provide as much information as possible about the machine / the workpiece / and fixturing. GENERAL INFO. Cracks can result from improper overlap or no overlap and not enough clamping force. From improper welding wheel speed. Surface condition of the material at the interface. Improper weld wheel shape. Excessive weld current. Improper flood cooling (if you are in fact flood cooling).

-- E. William Lucas (billlucas@tjsnow.com), November 29, 2000.

If the crack is straight thru your weld is too hot. 2. If the crack is a split accross your weld is too cold. If your weld is cold check your lap guage. if its too hot check your first heat. Also your pusher could be comming in too far. Also if you are turning up your welder to get the metal to stick more than the original weld programs shunts in the welder should also be checked out.

-- Dave Shorkey (dshorke@hotmail.com), January 18, 2002.

MAYBE YOU COULD TRY USING 100% ARGON AND AT THE END OF EACH SEAM WELD LEAVE THE TORCH SO THAT THE ARGON CAN SHIELD THE SEAM WELD, PROTECTING IT FROM ALL TYPES OF UNWANTED PARTICLES ESPECIALY CRACKING

-- TRACIE HARRIS (APPLEDAPPLE25@AOL.COM), June 27, 2002.