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Related Articles


4130 PQR

4130 PQR

4130 PQR

Hello All,

I would be starting with the welding of 4130 material with ER100S-G(TIG,MIG), E101T1-GM(FCAW) and F9P8-EF3-F3-H4(SAW). PWHT @ 1150 F for 2 hours. 3 Sizes of pipe
3" Sch 160, 9.61 O.D. X 1.25" and 18" O.D. 1.88 AW. I have been reading a lot about this material. But some practical experiences on 4130 will help me in taking care while welding the PQR.

Request everyone's opinion on this.


RE: 4130 PQR

You did not address preheat, in this case given the base material, I would use 350 deg F, minimum. Watch your heat input with the SAW.

RE: 4130 PQR

metengr - For the TIG and MIG wire, do you use a Purging gas?

RE: 4130 PQR

Only for TIG and MIG welds with no backing.

RE: 4130 PQR

What wire did you use?

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