Dear experts. I am facing a problem in boiler water wall TUBES SA 213 T12 grade material. The main problem is when we try to weld tube to tube spiral weld wide root gap comes 6 to 8 mm. Can we weld the joint with same root gap. As I know root gap is not essential variable for WPS. Can we go further with this wide root GAP ? If distortion comes during welding then what is the acceptance criteria as per various ASME, AWS. Section in RT? We try to come these two tubes closer with hydraulic jack after welding we found CRACK due to over stress. Can spool Piece is only solution of this type of joint? Please suggest me. VISHWAS. (QA/QC)
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