Not logged inAmerican Welding Society Forum
Forum AWS Website Help Search Login
Up Topic Welding Industry / Inspection & Qualification / lap welds/fillet welds
- - By rocketman1045 Date 10-31-2011 02:45
I have a situation where we are making a lot of lap welds on my job. The question came up about fit-up gap. I was under the impression that the max fit-up gap for a faying surface was 1/16" per D1.1. Others are looking at the weld as a fillet and saying that the max gap can be up to 3/16". The steel thickness is .750". Can anyone shed some light on this??
Parent - - By 99205 (***) Date 10-31-2011 04:50
D1.1(2010) Clause 5.22.1 addresses the 3/16/fillet weld statement while Clause 5.22.1.1 addresses Faying Surfaces and mentions the 1/16 seperation.  Not knowing the whole story on your situation, you should read the mentioned clauses to see which one applies.
Parent - - By 803056 (*****) Date 11-03-2011 20:58
That clause is addressing the fit between members that will be plug or slot welded or the gap between a backing bar and the underside (root side) of a groove weld. It has nothing to do with the fit of a lap joint. I would defer to the root opening requirements, i.e., 1/16 inch max. without correction, 3/16 inch max. with an increase in fillet size, etc.

Best regards - Al
Parent - - By 99205 (***) Date 11-04-2011 02:48
Maybe you misinterpreted my post Al.  I was just pointing out those clauses, because the contained the dimensions that were mentioned.  I wasn't saying tthose clauses contained the answer to his situation.
Parent - - By 803056 (*****) Date 11-04-2011 04:05 Edited 11-04-2011 04:17
I don't think I misinterpreted what you wrote, I was simply attempting to provide a little more detail based on the clauses you listed. I believe we are both thinking along the same lines.

Best regards - Al
Parent - - By kkfabricator (**) Date 11-19-2011 15:43
I too am working on a project that is all lap joints. It is a 68" water pipeline that is welded from the inside. There have been locations where the fit up was incorrect (up to 7/16" in some cases). All of the locations where there was Any gap between the faying surfaces I have required the welders to bring them into contact. They complained at first, but now do it before having to be told. My belief is that it falls under the fit up of fillet welds, but setting a precedence of what you want makes the project go smoother in the future.

Chuck
Parent - - By Duke (***) Date 11-19-2011 16:34
AWWA C206 gives you 1/8" separation on those laps.    4.6.3
Parent - - By 99205 (***) Date 11-19-2011 17:29
That standard recognizes the American Welding Society D1.1 as the supporting document.
Parent - By kkfabricator (**) Date 11-24-2011 01:02
99205 is correct. The specs state that in the event of any conflict arises than D1.1 governs.
Up Topic Welding Industry / Inspection & Qualification / lap welds/fillet welds

Powered by mwForum 2.29.2 © 1999-2013 Markus Wichitill