We would like to weld a reducer to a weldneck flange with a full penetration weld in a V groove. The reducer is A106 which is included in the AWS D1.1 table of pre-qualified base metals but the weldneck flange is A105 and is NOT in the table of pre-qualified base metals. When I go through all of the pre-qualified base metals, it seems that non of them are pipe fittings (like a standard ANSI bolt pattern weldneck flange). It all seems to be plate, sheet, pipe, or tubing.
What am I missing? How do you weld standard weldneck flanges to pipe using AWS D1.1?
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