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Method to eliminate weld solidification cracking of 312 stainless steel overlay and to minimize the overlay's thermal expansion mismatch with carbon steel or low alloy steel substrate
Method to eliminate weld solidification cracking of 312 stainless steel overlay and to minimize the overlay's thermal expansion mismatch with carbon steel or low alloy steel substrate
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机译：消除312不锈钢表层的焊接凝固裂纹并最小化表层与碳钢或低合金钢基材的热膨胀不匹配的方法
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摘要
A method for applying a stainless steel weld overlay on a substrate, e.g., a carbon steel or low alloy steel, uses an arc welding process. The process includes welding a stainless steel weld overlay onto the substrate using a shielding gas mixture including greater than 2% nitrogen by volume with balance being an inert gas or a mixture of inert gases. The nitrogen is of a sufficient concentration so as to eliminate solidification cracking in the weld overlay. In addition, the nitrogen may help to eliminate a mismatch in me coefficient of thermal expansion between the weld overlay and the substrate. Furthermore, if the weld overlay comprises only a single layer, the nitrogen concentration in the shielding gas mixture may be less than 2%.
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