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我公司为某化工厂制造的换热器 ,其壳体材质为2 0MnMoNi5 5 (δ =5 2mm) ,在产品最终热处理后对环缝再次射线检查时发现裂纹 ,再用超声波复探时 ,在近焊缝表面处出现了整圈的断断续续的微裂纹。1 缺陷分析该产品环焊缝在焊后后热处理后对接头进行10 0 %UT、10 0 %R
My company is a chemical plant manufacturing heat exchanger, the shell material of 20MnMoNi5 5 (δ = 5 2mm), after the final heat treatment of the ring girth ray examination again found cracks when re-use of ultrasound when the probe in the Near the surface of the weld appeared a full circle of intermittent microcracks. 1 Defect Analysis The product after the heat weld ring weld joint after the joint 10 0% UT, 100% R