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Tolerance for sagging at Beam to Beam Weld joint

Tolerance for sagging at Beam to Beam Weld joint

Tolerance for sagging at Beam to Beam Weld joint

(OP)
Dear Experts,
During fabrication of Tank Roof structure, we are facing some distortion / sagging at Beam to Beam butt welded joints (A992 W shapes).
Can you guide me how much is the tolerance for it and which reference documents to be referred (AISC or other)?

RE: Tolerance for sagging at Beam to Beam Weld joint

I have a hard time visualizing your problem. Not sure what sagging 'at weld' really means. Are the beams themselves deflecting or is the problem only with a connection? If the latter then do you mean there is a rotation at the connection? IF butt welded then it is not possible, please provide more info...

RE: Tolerance for sagging at Beam to Beam Weld joint

Could it be that the welding was just a little suspect? If the weld is low maybe they ground off a bit too much when they were cleaning it up.

RE: Tolerance for sagging at Beam to Beam Weld joint

Could be many issues - welding done too hot seems like the main possibility.

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RE: Tolerance for sagging at Beam to Beam Weld joint

If the rafter is deflecting/sagging then maybe the rafter is undersized for its span. If the weld was done poorly (not full penetration provided) then it either have to be tested (UT), reopaired or deemed insufficient and replaced. Is the member isntalled yet and loadedd with roofing/ etc.. or not?
IF there's any overgrinding visible then the capacity of the member/section is reduced and it needs to be repaired.

RE: Tolerance for sagging at Beam to Beam Weld joint

good pint JAE - improper welding technique could be to blame also...

RE: Tolerance for sagging at Beam to Beam Weld joint

(OP)
Thank you All !!

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