Weld Repair for 4330 Mod
Weld Repair for 4330 Mod
(OP)
Has anyone ever done a weld repair on 4330 mod?
We have a heavy block that needs a small gouge filled. The weld will not contribute to any strength and will only fix a dinged sealing surface.
The ys and ts are 150 to 165 psi and the hardness approximately 330 BHN.
Since the weld is so small (~.125in) I was going to specify a stainless filler 316 with a GTAW process. Preheat to 600 F and then slow cool.
Any suggestions would be appreciated.
jackboot
We have a heavy block that needs a small gouge filled. The weld will not contribute to any strength and will only fix a dinged sealing surface.
The ys and ts are 150 to 165 psi and the hardness approximately 330 BHN.
Since the weld is so small (~.125in) I was going to specify a stainless filler 316 with a GTAW process. Preheat to 600 F and then slow cool.
Any suggestions would be appreciated.
jackboot





RE: Weld Repair for 4330 Mod
RE: Weld Repair for 4330 Mod
Wouldn't the martensite formation be from the "contact quench" of the hot arc on the base material? Or would the 309L capture more of the carbon so that it would tend to limit this martenisitic structure?
We can do the PWHT, but since we are welding a spot (very small) I didn't feel the PWHT is necessary. But I forgot the need to chase out the hydrogen.
jackboot
RE: Weld Repair for 4330 Mod
RE: Weld Repair for 4330 Mod
I was just looking at the diagram when I saw your reply.
Thanks,
jackboot
RE: Weld Repair for 4330 Mod
I have also successfully used E7018 with SMAW and ER70S-2 with GTAW and a 600F minimum preheat and 600F dehydrogenation heat treatments. I also used a temper bead technique followed by grinding to remove the temper bead after performing the dehydroghenation treatment. In these cases the dissimilar (high alloy) metals could not to tolerated for the service.