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That sounds like trying to weld hardened steel
Posted By: Willbird In Response To: From what I have been told: (bob bowman)
Date: 7/7/20 02:42
In Response To: From what I have been told: (bob bowman)
I have seen folks try to tack weld high speed steel cutters, and to tack weld case hardened steel and the same thing happened.
The welding process does a good job of annealing but at some zone outside the welded area portions of the metal end up where steel is when we first quench it but have not yet tempered it.
I know for stuff like stamping dies they heat the whole thing in a heat treat oven first with a slow ramp up and then a soak time. Then weld, then immediately back into the oven for a soak and ramp down in temperature. Maybe a “double draw” too where if the initial was 375F the second draw might be at 360F. Double draw is a stress relief more or less.
The pre heat before welding may prevent that zone of glass hard metal that comes from spot heating then allowing the mass of the part to quench the heat away ?
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