Brackets in Mild or 4130 ?

[Garage Dog 65]

Gents,

Getting ready to waterjet my suspension bracket files. Reading a couple chassis books and they recommend that all brackets be made in 4130. I don't doubt that would be a better bracket material for strength and toughness – and I plan on doing it if it makes sense.

Just wondering what welding challenges I’ll face welding those onto mild steel tubing ? Any special filler rods or heat treating process I should be aware of ? Should I stick with mild steel for the brackets too ?

In aviation we do the whole deal in 4130 and heat treat the assy after finish welding. Racing is probably the same, but I don’t plan on doing the rails in 4130.

Your help is ALWAYS greatly appreciated.

Thx, Jim