Gaps for square butt weld?
Gaps for square butt weld?
(OP)
Hello all,
I am trying to determine the size of the gap for a square butt weld between to beams butting each other (a splice,) however the code does not seem to give guidance on exactly how much the gap should be.
Is there a rule of a thumb out there?
Much thanks.
I am trying to determine the size of the gap for a square butt weld between to beams butting each other (a splice,) however the code does not seem to give guidance on exactly how much the gap should be.
Is there a rule of a thumb out there?
Much thanks.






RE: Gaps for square butt weld?
RE: Gaps for square butt weld?
RE: Gaps for square butt weld?
Mike McCann
McCann Engineering
RE: Gaps for square butt weld?
RE: Gaps for square butt weld?
RE: Gaps for square butt weld?
Full pen butt welds are listed in Figure 3.4 and require backing or backgouge (SMAW, FCAW, GMAW, SAW). Most of these list the root opening as the base metal thickness or less.
You may want to post your required joint in the AWS or welding sections.
ZCP
www.phoenix-engineer.com
RE: Gaps for square butt weld?
Full penetration on HSS box tube is very difficult to get right. you may be asked/challenged if partial penetration welds are acceptable. if that is what is to be built.
if it's W-shapes, then there is no problem getting full or partial penetration.
regardless of which, can you specify AWS pre-qualified welds be used and let the fabricator deal with it?
RE: Gaps for square butt weld?
For full strength splices of closed sections, internal backing strips are necessary.
Letting the fabricator deal with the type welds you need is not always good enough. The designer should require the welds to be shown on the shop drawings for review.
RE: Gaps for square butt weld?
RE: Gaps for square butt weld?
i agree on both. let me clarify. i was speaking about whether or not to call out the gap size on the flagging. i would expect that you would flag and call out the type and size of weld, but not the gap unless there was a basis for not using a AWS prequalified weld or only using a certain AWS prequalified weld procedure.
RE: Gaps for square butt weld?