Need some brainy cromo bar help.

[Tinker]

Originally Posted by Kmelander

So...I guess I can’t weld on it or I’ll have to re-temper it?


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I am not a welder, but am a machinist with 30+ years of experience working with metals, so I can't give you exact details.
Generally this material would be welded in an annealed(soft) condition. Proper welding includes preheating the material and maintaining temperature while welding (not too hot) and letting the weldment cool slowly. ( to keep metal soft, a weldment is sometimes buried in a pile of sand post welding that allows it to cool very slowly. ) if the metal gets too hot and cools too quickly it may crack at the welds. After welding the weldment would be heat treated as a unit to desired hardness.
(Your piece can be annealed, welded, and re heat treated, but it may not be necessary, and too many processes can have the tendency to warp the metal.)
Now that I scared you, I am sure some good welders can give you Proper advice to weld it in its current condition without it softening or cracking, or do an internet search on welding 4340 in a T1 condition.
Good luck.

[raustinss]

I'd say spline the ends of the bar and then make the ends that connect to the control arms aka Detroit speed splined sway bar style. No welding ,no heat treat etc etc