Continuous welds or not
Continuous welds or not
(OP)
Hi all,
I have a question regarding welds. As an example, if I need or specify a 2" lg fillet weld, I have been in the habit of specifying (2) 1" welds spaced at say 1 1/2" crs.
My reasoning is that if a crack develops in the 2" weld, it will propogate and eventially fail. Whereas, in the event of a crack in one of the 1" welds, the other will hold and repairs can be done.
My question is, why would some PE's be adverse to this and reqeust continuous welds in the drawing mark ups before certifying.
I have a question regarding welds. As an example, if I need or specify a 2" lg fillet weld, I have been in the habit of specifying (2) 1" welds spaced at say 1 1/2" crs.
My reasoning is that if a crack develops in the 2" weld, it will propogate and eventially fail. Whereas, in the event of a crack in one of the 1" welds, the other will hold and repairs can be done.
My question is, why would some PE's be adverse to this and reqeust continuous welds in the drawing mark ups before certifying.





RE: Continuous welds or not
One of the most common crack in a weld is a crater crack or shinkage crack at the end of the weld. In Structural Steel Fabrication I probally find 1500 crater cracks to any other type of welding crack on new construction. On existing structures crack when found where either crater or shrinkage cracks missed during fabrication or fatigue cracking.
The starts and stops are also a stress concentrators, look for fatigue cracking to start here.
At the starts and stops expect to find more martensite (Hard and brittle) during to rapid cooling.
RE: Continuous welds or not
There are other statements about fillets terminating at the ends or sides of parts being reterned continously aroud the corners for a distance of not less than twice the leg length. This procedure being important for fillets on the tension side of parts carrying a bending load.
There are probably other similar statements in other structural welding codes.
RE: Continuous welds or not
One thing to remember is that when someone mentions leg length they were talking the longest leg. I was just involved in philosophical dispute about this and I lost.