Welding A572, Grade 60
Welding A572, Grade 60
(OP)
I have a contractor that will be welding 0.50in. thick A572, Grade 60 plate that has to be welded to itself, to A36 and to UNS S3210 (unassigned)Duplex SS material.What precautions should they take when welding these materials. What welding rod should they use.It looks like 80ksi filler material should be used, preheat min. 50 F.





RE: Welding A572, Grade 60
Now for the A 572 Grade 60 to the duplex, you need to use SFA 5.4 E309MoL weld rod. Minimum preheat as above, and keep the interpass temperature below 350 deg F.
RE: Welding A572, Grade 60
I've been dealing quite a bit with these specific materials as of late, and various requirements and specifications, depending on project and industry, can drive you towards consumables other than those that metengr has suggested.
Depending on code, there are some prequalified procedures that can often be taken advantage of using 80 series electrodes.
Additional precautions can also be taken based on whether any supplemental requirements for the duplex are invoked.
RE: Welding A572, Grade 60
metengr's recommendations will develop the full strength of your 60-series material. He has given you very good advice.
RE: Welding A572, Grade 60
I've also been pushed to 80 series wires with processes other than SMAW when certain impact requirements were invoked that a 70 series wire couldn't meet. All dependent upon the application it's being applied to.
RE: Welding A572, Grade 60
For a WPS that you will be making a PQR coupon for, like all ASME [or for welding w/o a WPS] metengr and I are correct. Stay away from overmatching filler to basemetal. You will have cracking start at preheats that would have been sufficient with a matching filler.