I am in a debate with a colleague regarding the PWHT for partial penetration tube to header welds. Code of construction is ASME Section 1 (Table-PW-39-4) Header is SA-335-P22 (P5A) 14" Sch 160 1.406" tube material is SA-213-T22 2" x 0.165" (P5A) Tube is inserted into a machined "J" type groove with a depth of 0.250" completed weld will be a 0.-375" fillet weld. General Notes (a)(1)(b) a nominal base metal thickness of 5/8" or less at the weld. it is my take on this is PWHT is not required as long as all the other requirements are met. Please advise.
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