which the metal base, the process, the addition metal ???
Base metal is a935, filler is E71T1. The problem really isn't the metals I think. I feel it is the fact that two welds crossed each other and the effect was a double hardening of the area and the introduction of residual stresses.
You said the formed steel angle is cracking. At what radius was the angle formed? Was the heel (outside bend) welded? There is a minimum cold bend radius based on material thickness and grade. If a bend radius tighter than the minimum is used, the heel could crack. Also, plates should not be bent with the grain. If for some reason they have to be, a larger radius should be used.
The crack is nowhere near the radius.
The good engineering practice has long recognized that welds should not cross each other. That's why welds in pressure vessels and storage tanks are always staggered, as demanded by ASME VIII, API 650 and AWWA D100.
By crossing I mean two welds that actually make a cross, i.e., two lines one above the other at 90 degrees.
Giovanni S. Crisi
Sao Paulo - Brazil
Out of curiosity, how long are the weld joints, what configuration are the welds, and how thick are they?
Chet Guilford
the lowest joint is a filet 5", next is a square groove 5", top is a bevel groove 2". All are 3/8".
Residual stress.
Use preheat etc. and follow a wps you prepared and tested.
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