Skewed T Joint Pass Size - AWS D1.1
Skewed T Joint Pass Size - AWS D1.1
(OP)
Hello,
I'm trying to write a prequalified WPS for AWS D1.1:2008. I have a skewed T joint as in figure 3.11(D). My concern is that I can't see how the first pass could be made without the depth being greater than the face width (as prohibited by 3.7.2 and fig 3.1.) Is it typical to ignore that provision for the first pass of this detail. Can I count the Z loss dimension against this requirement? Is there something silly I'm missing? In case it matters, the process is FCAW-G.
Thank you for any help you can offer.
--Ethan
I'm trying to write a prequalified WPS for AWS D1.1:2008. I have a skewed T joint as in figure 3.11(D). My concern is that I can't see how the first pass could be made without the depth being greater than the face width (as prohibited by 3.7.2 and fig 3.1.) Is it typical to ignore that provision for the first pass of this detail. Can I count the Z loss dimension against this requirement? Is there something silly I'm missing? In case it matters, the process is FCAW-G.
Thank you for any help you can offer.
--Ethan





RE: Skewed T Joint Pass Size - AWS D1.1
RE: Skewed T Joint Pass Size - AWS D1.1
If one refers to AWS D1.1:2010, it will be noted that for connections where the angle between adjacent members is less than 80 degrees, the term fillet weld is not used. In cases where the dihedral angle is less than 60 degrees, the Z-loss must be considered. Essentially, there is a potential for a void to exist where a Z-loss is greater than 0.
Best regards - Al
RE: Skewed T Joint Pass Size - AWS D1.1
I've attached a sketch of the weld I'm concerned about. On the first pass, the depth of the pass will be larger than the width at the face. In my case, z-loss is zero, so I'm assuming the weld does reach all the way to the root. Based on that, this weld appears to contradict the requirement of 3.7.2 even though it's explicitly prequalified by fig 3.11(D).
I'm not realistically that worried about centerline cracking. We're using a small first pass and haven't had any problems on production welds. I just wanted to see if others had encountered this problem, or if there was a commonly accepted interpretation of this requirement. When we need more than one pass, we can split the second layer and restore order to the universe.
Thanks for any advice.
RE: Skewed T Joint Pass Size - AWS D1.1
Best regards - Al