I would like to weld a piece of hardened steel but i don't want to ruin the treatment on the tip of the piece. Can i put some ice in the middle of the shaft so the heat generated from the welding (SMAW DCEN) doesn't temper the tip? Thanks in advance.
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If you post a photo or mech dwg of the piece in question you may get more useful responses. – Carl Witthoft May 30 '18 at 17:55
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I think the heat is going to be too localized that it won't be conducted well to the ice. Maybe better would be to cool the part before welding? – May 31 '18 at 11:28
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Combined, final answer --- NO ! – blacksmith37 Jul 29 '18 at 17:20
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It will reduce the weld HAZ some , but not much. It depends on the dimensions and the heat input of the weld, the alloy , the original hardness , and the original heat treatment. The primary cooling is by conduction which is affected by the temperature difference. So the temperature difference will be 75 F / 2800 F , or 32 F /2800 F , not much of a difference. And, if the steel has much carbon ( eg. over 0.15% ) , the weld HAZ will contain some hard brittle zones with a significant chance of cracks.
blacksmith37
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Second, more planned answer . Hard steel ( Rockwell C 35 +) is not, can not be welded. In an unfortunate situation where it must be attempted ; 1 - Soften at about 1300 F , one hour . 2 - Preheat to 400 F ( I have recommended up to 600 F) . 3 - Weld. ( maintain preheat ). 4 Inspect for cracks. 5 - Soften the weld HAZ at 1300 F. 6 Heat-treat , quench and temper, according to the alloy.
blacksmith37
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