A-Arm material
A-Arm material
(OP)
Is there any possible reason to use 4140 pre-hard to make the machined parts (that the spechrcals mount into) on a set of racecar A-arms. The parts will be normalized, but not heat treated, I can't see how theyr'ed be ANY reason to use pre-hard, with the welding and normalizing.
The prints for some of the parts have pre-hard as the material, but I don't understand why.
Thanks,
Chuck
The prints for some of the parts have pre-hard as the material, but I don't understand why.
Thanks,
Chuck





RE: A-Arm material
After welding the 4140 would have to be heat treated to remove the HAZ from welding, I dont know the specifics on the time and or temps thoug.
RE: A-Arm material
RE: A-Arm material
RE: A-Arm material
One idea is that the pre-hardened 4140 parts would not be welded, but instead would be low temperature brazed using a bronze alloy (often called TIG brazing). Provided the brazing temperature is below the tempering temperature, you can have your cake and eat it too with regards to HT properties and ability to be joined.
RE: A-Arm material