welding a continuous weld across the flange over the web W59

[INSPECTACON]

I have a question with regards to welding a continuous weld across the flange over the web to attach pipe supports. I have always seen a gap left at the web when welding across the face of a flange.Can anyone reference W59 with this requirement
thanks

 

[Ron]

What is W59?

 

[jayrod12]

Canadian welding standard. CSA W59-13 is the most current I believe.

 

[INSPECTACON]

bump

 

[dhengr]

INSPECTACON:
A sketch of the condition and detail you are talking about would really help explain what you are dealing with and talking about. I can’t see it from here. I don’t have a copy of CSA W59-13, so if you wait a year or so until I get a copy... But, I think I can explain the rationale for what you claim to have seen. Generally, you should not need great big welds btwn. a pipe support/saddle, or whatever, and the support beam/column, or you might be applying/implying a significant lateral/torsional load to the support member. And, this darn well better be justified by some extra engineering calcs. and judgement to prove the support member. So, given reasonable sized fillet welds btwn. the saddle and the support member, you usually don’t want to weld across a tension flange in any case. That’s a potential stress raiser in a tension field. When you are welding across a flange, on its outer surface, you want to tend to avoid the flg./web connection region because the residual stresses from rolling or fabricating are quite high in that region. It is also a hard spot, very stiff, unyielding, and subject to cracking due to welding. So, they might be stopping the weld short of that region, because someone had some of the above discussion with them. But, the other side of that coin is that each weld start and stop is a potential stress raiser near that region, not a good situation either. At the very least, you end up with fairly high triaxial stress in this region when you weld across it. In some instances, this wouldn’t prevent me from doing that weld though. If you are welding on the inside face of the flange, you don’t want to try to weld into the radius btwn. the flg. and the web for the same reasons.