Med/High Carbon wheel hub to mild steel

[Tilly819]

Hi all

I have turned a new drive flange (12mm mild steel) to weld on to what appears to be a med / high carbon steel (spark test) subaru hub (definetly not mild, very pritty sparks)

I pre heated both components to aprox 175C and tacked with SS312 filler
the tacks cracked almost instantly

I think i require hotter pre heat and a post heat and would like to get some input on this??

also is there a better filler to use than ss312

cheers tilly

 

[Tilly819]

Anyone?

Went over to the local welding place today go get some bits and had a word with them and they give/sold me a couple of nickle 99 rods to try with the assumption that the subaru hub is cast steel.

tilly

 

[TechnicAl]

Im not sure but arent the hubs cast iron. If the Nickel 99 rods wont work youve got a problem. Dont preheat it. Keep it cool, Short runs and peen the welds straight after welding. Allow one weld to cool before you put the next one on.