Maximum size fillet weld that can be done in single pass
Maximum size fillet weld that can be done in single pass
(OP)
What is the maximum size fillet weld that can be done on site in a single pass?
5 mm? 6 mm? 8 mm?
5 mm? 6 mm? 8 mm?






RE: Maximum size fillet weld that can be done in single pass
https://app.aws.org/forum/topic_show.pl?tid=33799
RE: Maximum size fillet weld that can be done in single pass
A good structural engineer is often a blessing for others.
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
Mike McCann, PE, SE (WA)
RE: Maximum size fillet weld that can be done in single pass
In any event, AISC lists 5/16" (8 mm) for fillet and single-bevel groove welds.
RE: Maximum size fillet weld that can be done in single pass
AWS D1.1 Structural Welding Code/Steel provides some excellent guidance if you look at the table 3.7 for prequalified welds.
Best regards - Al
RE: Maximum size fillet weld that can be done in single pass
Decades ago I too was told 3/16" was the maximum size for single pass weld, but it seems based on what gatw and others here say it is a little more complicated than that. Since I do not have copies of the referenced documents to which you refer, let me rephrase my question, as follows: For steel plate to steel plate fillet welding on site, some of it involving overhead welding, is there a significant cost difference between 5 mm and 6 mm (3/16 and 1/4:) fillet weld of 50,000 psi yield strength steel. I would say that if the 6 mm weld requires an additional pass, then there is a significant cost and time difference.
RE: Maximum size fillet weld that can be done in single pass
Best regards - Al
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
More often I find you specify 5mm with a view to some economy, and you end up with an 8mm+ fillet round these parts. Welders like to weld I guess.....
Additional passes are where the cost increases, or full penetration welds, because of the prep required to the plates and preparation between individual passes.
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
Dave
Thaidavid
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
Thaidavid
RE: Maximum size fillet weld that can be done in single pass
RE: Maximum size fillet weld that can be done in single pass
As a normal practice, I require the welder to pass a T-fillet break test described by AWS D1 structural welding codes. It is surprising how high the failure rate is. I believe the codes fail to take this into account. Many of the code provisions relating to performance qualification were developed when SMAW was the predominant welding process. Using a large diameter electrode, i.e., 3/16 inch, it was easy enough to make a single pass 1/4 or 5/16 inch fillet weld. That is no longer the case. The codes are in agreement that a welder that qualifies on a grooved joint (plate or pipe) is automatically qualified for filet welds. Therein lies the disconnect. My experience has been that a welder that can pass the single pass fillet break test can easily pass the grooved joint test, but a welder that can pass the grooved test will more than likely fail the fillet break test. The disconnect is that the codes (AWS, ASME, etc.) fail to recognize the degree of difficulty the large single pass fillet present when welding with GMAW or FCAW.
Best regards - Al