Welding of AISI 4130
Welding of AISI 4130
(OP)
Hi all,
I need some advice on weld compatibility of material grade AISI 4130 (7K yield strength) with existing tubing grade J 55 (API 5CT, yield strength 55K).
Are these two materials grades (AISI 4130 and J55) fall under “low alloy steel category” ? Can they be welded together ? if so, what is common filler metals used for the welding and applicable code (ASME IX or any) ?
What are precautions to be taken when welding (pre-heat, PWHT etc.)?
Regards
I need some advice on weld compatibility of material grade AISI 4130 (7K yield strength) with existing tubing grade J 55 (API 5CT, yield strength 55K).
Are these two materials grades (AISI 4130 and J55) fall under “low alloy steel category” ? Can they be welded together ? if so, what is common filler metals used for the welding and applicable code (ASME IX or any) ?
What are precautions to be taken when welding (pre-heat, PWHT etc.)?
Regards





RE: Welding of AISI 4130
I would suggest an 80 series filler metal if using SMAW or similar with other welding process with 400 deg F preheat. The PWHT temperature and time will depend on thickness of the 4130, and final tempering temperature of the 4130 steel to avoid over tempering.
RE: Welding of AISI 4130
yes, it is butt weld.
Can "AISI 4130 and J-5" be categorized as carbon & low alloy steel ??
Regards
RE: Welding of AISI 4130
RE: Welding of AISI 4130
It is J55- (API 5CT).
Are these materials (AISI 4130, J55, K55) low alloy steel ?
RE: Welding of AISI 4130
RE: Welding of AISI 4130
I'm guessing the 7ksi yield strength was really 70 ksi.
Motorsports often uses 4130 Condition N. The thin wall sections mean even with modest preheat the cooling is not quick enough to "Quench" and harden the material, especially if mild steel filler is used so the weld proper is diluted.
Even with the relatively intense heat of TIG welding.
http://www.lincolnelectric.com/en-us/support/weldi...
Is your application bound by industrial codes?
RE: Welding of AISI 4130
I have one more query.
There is one more Casing Swage (API 5L X-56) to be welded on to Casing head spool (AISI 4130).
Again, my question is on welding compatibility :
Can we weld API 5L X-56 to AISI 4130 ?
Regards
RE: Welding of AISI 4130
Regards
RE: Welding of AISI 4130
RE: Welding of AISI 4130
RE: Welding of AISI 4130
My point is that if you are going to weld a casing grade, always get a MTR with a chemical analysis. If you have lost heat traceability, get a chemical analysis done. And, if you are going to weld 4130, watch out for cracks. In thin sections, you can be fine with no preheat/postheat, but if you start getting much over 1/4", it can crack.