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Welding 4130 prehard to soft steel.
- Thread starter ossi
- Start date
- Replies 8
- Views 3,511
Heavey Metal
Banned
- Joined
- May 10, 2011
- Location
- Texas
Plenty of preheat and you will be fine.
with 4140 I like to see 600F preheat
with 4140 I like to see 600F preheat
kustomizingkid
Titanium
- Joined
- Aug 2, 2010
- Location
- Minnesota
A post weld draw down probably wouldn't be a bad idea either...
Heavey Metal
Banned
- Joined
- May 10, 2011
- Location
- Texas
stressrelieve nd a slow cool.
Mud
Diamond
- Joined
- May 20, 2002
- Location
- South Central PA
The mild steel pipe shouldn't get brittle, but the 4140 will. Since it's solid, brittle won't matter unless there's impact, I'd expect the pipe wall to fail first unless it's very thick. Preheating is good, at least 200°F on the 4140 will reduce embrittlement. Use mild steel rod or 308 stainless rod for maximum ductility.
Co2 mech
Cast Iron
- Joined
- Mar 28, 2009
- Location
- Nebraska, USA
We weld 4140 in production, pre heat to 400 and take the temp to 600 with the weld, cool slowly. If you want the hardness of the pre hard you will have to heat treat after it cools.
Regards
Regards
