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We have welders testing for the D1.8 Supplemental Welder Qualification for Restricted Access Welding. The question has come up if we can weld the root pass with a 1/8 diameter rod, and all subsequent passes with a larger 5/32 diameter rod to complete the joint.
D1.8 references Table 4.12 Welding Personnel Performance Essential Variables Changes Requiring Requalification. Item (4) clearly states "to a diameter or thickness not qualified". My interpretation is that if we qualify the welder using 1/8 at the root, and then change over to a 5/32 rod to fill the restricted access joint during the welder qualification, we will satisfy the requirement of item (4). Is this your understanding as well? We would also need to include this in our WPS.
Item 4 has nothing to do with filler metal diameters.
You are governed solely by what your WPS allows.
If the WPS allows the change then your welders are good to go.
I do not have a copy of D1.8 but D1.1 allows an increase of 1/32" without requalification,
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