I recently got a call from a gun dealer who wanted to know if I could weld on gun metal. More specifically he asked if I could do Chromemoly or high carbon steel. I thought it was a bike enthusiast at first.
So when we talked it turns out that he needs to modify a gun barrel by filling in an indent for a pin that locates the barrel in position. It is going to be adapted to another application and the original hole needs to be filled in and turned down, then a new one will be machined.
I have never welded gun metal formally and would like to know what the correct procedure might be and what type of filler metal is best suited. I was doing some initial research on line and found a site that talked about using a certain type of silicone bronze rod for gun metal.
Any thoughts on this? Aside from some pre-heat, easing off of the pedal as I break the arc to avoid the dimple, what should I take into account? Preheat, type of filler rod, procedure?
The only time I welded on gun metal was on an old .30 cal carbine that had developed a split in the slide rail from a hot reload. I TIGed it and have had no problems with it since. I used regular mild steel filler rod for the job. That was a by the seat of my pants repair.
Any help is appreciated.