Given you information there are no maximum weld size for fillet welds in T-joints. A rule of thumb is that the weld size need not be larger than the thinnest material being welded(again as a rule of thumb) unless specs or drawings say differently. Keep in mind lap joints using fillet welds have restrictions on them(fig. 2.1).
Hope this helps,
Brian J. Maas
Agree with Brian, there is a maximum size for lap joints see 2.3.2.9 in the 2004 edition. Also, the toe of the weld should normally be 1/16" below the edge of the base metal for lap joints.
Good answers, I just wanted to add: while D1.1 doesn't give a maximum to fillet sizes (excluding lap joints here) there is a section on distortion control in 5.21. It basically says you have to be able to control or plan for distortion. Naturally overwelding can increase the amount of distortion, not to mention increased labor and consumable costs, and customer appeal. So while there is no verbatim limit, there is a practical limit.
But I suspect you knew that already.
Chet Guilford
Older editions of D1.1 required welds to be no more than 50% oversize or overlength. Surprised to hear that newer editions don't restrict this parameter. I'll be looking it up when I get to the office.
Which edition might that be in? I have a couple of older ones.
Brian J. Maas
Try paragraph 2.4.3...then 2.4.1.1...then Table 2.3(see note 1). Make the calculations for the weld size the designer specified (in your case 1/4"); that is your max fillet weld size for the above described application.
Best regards,
Vonash
Where exactly is 2.4.3 and 2.4.1.1. Its not in the 2002 edition.
Brian J. Maas
Sorry...I have 1998 code.
Hi Brian,
I've found myself wondering if the 2004 had something different too, I'm still waiting for my copy to arrive.
Hi vanosh,
AWS moves those sections all around every couple years and it's hard to keep up. I don't see how they get the book as accurate as they do with all that switching around.
John Wright
OK,
Got the 2004 code...Table 3.7 is the same...paragraph 3.7.2...then commentary C3.7.2.. Again it is to control shrinkage/stress in the weld.
Hope this helps,
Vonash
Hey everybody! I'm quoting a job that calls out a fillet weld. The one member is .188 and the other is .125 both hot rolled steel. The symbol does not have a fillet size called out on it. In the notes it just says weld to ANSI/AWS D1.1. Does this mean that I only need a 1/8" fillet or does D1.1 say different. This is for the Army so I'm not likely to get a fast answer from them so please advise- Thank you very much- Ted
P.S. the process will be GMAW. is there a prequalified wps that I could use? :) Thanks brothers
TRC
AWS D1.1/D1l1M:2004 paragraph 5.14 Minimum Fillet weld sizes refers you to table 5.8 which give you 1/8 minimum fillet weld on Base metal <or = to 1/4 in thick. (Unless it's for a cyclically loaded structure then it should be 3/16")
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