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一、前言我厂生产的起重机主梁,是由钢板焊接而成,它是起重机主要的承力部件,除要求钢板材质满足设计力学性能的要求以外,关键问题是钢板各个对接焊缝的焊接质量能否达到承力设计舰定的标准。对接焊缝焊接工艺复杂,易出现像未焊透、夹杂、气孔、热裂缝和冷裂缝等缺陷,尤其严重的是因对接焊缝部位所产生的热应力,会危及到与焊缝连接的母材边缘坡口的微观缺陷,如弥散状
I. Foreword The crane girder produced by our factory is welded by steel plate. It is the main bearing component of the crane. Besides the requirements of the steel plate material to meet the design mechanical properties, the key problem is the welding quality of the butt-welded steel plates Whether it can meet the standard of design of warship. Butt weld welding process is complex, prone to imperfections such as penetration, inclusions, porosity, hot cracks and cold cracks and other defects, in particular, is due to the butt weld parts of the thermal stress, will endanger the weld connection with the mother Micro-edge defects on the edge of the material, such as diffuse