Let it air cool slowly. The slower the better if your wife will let you preheat
the oven to 500 and you put it in there after welding all the better. You have
no idea what the metals are and even less equiptment to properly heat treat
them. Any of the tool steels or even mild steels are more than strong enough to
put in spark plugs no matter what the heat treat might be. Any of the other
methods you have mentioned will probably do nothing but crack the weld or make
the steel brittle.
Dave Dahlgren
Dick J wrote:
>
> I'm cutting off the open end of a 5/8" combination wrench, then welding the
>remaining handle and box end to a 1/2" drive 5/8" socket to create the worlds
>most versatile, all purpose header spark plug wrench. It will have the box end
>on one end of the handle, and the socket on the other. I'm going to torch
>weld this. In order to maintain the proper hardness for tool applications,
>(so it doesn't bend like those $2.99 China wrenches, or snap off like those
>$2.99 India wrenches) when I'm done welding, should I:
>
> a. Let it air cool
>
> b. Plunge it in cool water
>
> c. Plunge it in oil
>
> d. Other (like what?)
>
> Thanks
>
> Dick J
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