Welding Procedures
Welding Procedures
(OP)
I am Qualifying a welding procedure for Low temperature service with impact. senario is as follows
a) If I qualify pipe to pipe with SA 333 Gr 1 or 6 which
falls under P1 G1 category, I can weld on SA 516 Gr55,60
& 65, Sa 350 LF1, 420WPL6. But I cannot weld SA 516 Gr
70 and SA 350 LF2 as they fall under P1 G2.
My question is if I wand to weld SA 333 Gr 6 pipe to SA 350
LF2 flange how should I qualify.
Merzi
a) If I qualify pipe to pipe with SA 333 Gr 1 or 6 which
falls under P1 G1 category, I can weld on SA 516 Gr55,60
& 65, Sa 350 LF1, 420WPL6. But I cannot weld SA 516 Gr
70 and SA 350 LF2 as they fall under P1 G2.
My question is if I wand to weld SA 333 Gr 6 pipe to SA 350
LF2 flange how should I qualify.
Merzi





RE: Welding Procedures
You need a qualify a welding procedure specification (WPS) with impact (notch toughness) testing for P-No 1 Group 1 to P No-1 Group 2 materials in accordance with the impact testing requirements of the applicable piping standard.
For the WPS qualification, follow the supplementary essential welding variables listed under the particular welding process(es) you intend to use, as described in ASME Boiler and pressure Vessel Code, Section IX, Article II QW-251.2 and QW-252 thru 265.
RE: Welding Procedures
RE: Welding Procedures
Weldtech is talking about using dual grade materials, which I am aware of. But in this case I have a 2" Sch XH pipe (wall thk .281) welded to SA 350 LF2 flange. If I qualify on a Dual grade plate the thk available is only 1/4" with range from 1/4" to .5".
Merzi
RE: Welding Procedures
Bear in mind that heat input is limited to that used on the test plate, so you have to think it through and plan your attack.
RE: Welding Procedures
RE: Welding Procedures
I'm not sure if I'm missing something. My suggestions are referencing Sec IX requirements.