Hard Facing Wire To Join Mild and High Carbon

Fri Nov 19, 6:11 pm

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As I have not really attempted welding sprinģs, mainly cause I have not needed to. But that weld procedure I mentioned should work as good as any. Q and T plate may work better but as you said its not economical there....or anywhere these days.
I would do that with stick or dualshield 81ni wire 25 /75 gas. 71 would go ok but 81 is better for this and same price.
Handy tips, peen each run with needle scaler while its hot. Dont weld it while its 200C or above but dont let it cool right down below 150C. I.e dont weld while its near glowing is all you need to worry about in practise.
Weld one side 2 runs flip over and back gouge, grind into weld on other side to make solid metal when you weld.
2 runs then weld out however you want if its under 40mm total. Keep in mind if its over 40mm thick than a few runs or so then flip over to other side just to stop it pulling too much one way. You may already know this but it does rate a mention.
Run on and off tabs, will stop cold starts and rough stops. Just a 5mm bit of plate at each end of weld that gets cut off after. Just dont let it rapidly cool or you will get grain growth and brittleness, you may get some anyway, but post heat and slow cool will help minimise.
I hope it helps and let us know how it goes with the heat treat after.

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Ben D, N CA

Posted 4/4/ 00:15 (# - in reply to #)
Subject: RE: Hard Facing

Whiskey, Tango, Foxtrot

Whiskey, Tango, Foxtrot

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MIG welder is much faster, and I find it does a better job than stick. I always had problems with the stick, in order to get the rods to burn well and actually weld to the parent material, I had to use too much heat. You don't always want to actually 'weld' hardfacing in, esp on thin material like that. You just want to stick a bead onto it so it wears first. I've burned way to much stick hardfacing rod, but on heavy wear parts on crushers and loader buckets, dozer blades. It works fine on that, but I found MIG to be much easier to handle on thinner steel.

Flux core hardfacing wire is ironically, very soft. Sort of hard to feed. It is more expensive, but I much prefer using solid wire. Your buying all hard steel wire though, no flux. Have to weld mostly flat. Pull the bead instead of pushing the puddle.

Try different patterns and see what works the best. Some will wear better than others. Hard to know without seeing what your trying to hardface, but 45* patterns or X's usually work fine.