在矿山机械、起重机械等大型机械设备的制造中,广泛采用焊接方法制造各种梁、柱、机座和盘之类的构件。由于这类构件细长比大,焊后产生较大的焊接变形．校正变形浪费了大量的人力和物力,甚至使产品报废。因此,精心设计焊接结构,在生产中采用合理的焊接方法和焊接工艺是保证产品 In the manufacture of large-scale machinery and equipment such as mine machines and cranes, welding methods are widely used to manufacture various types of members such as beams, columns, mounts and plates. Due to the slenderness ratio of such components, a large welding deformation occurs after welding. Correct distortion wasting a lot of manpower and material resources, and even make the product scrapped. Therefore, carefully designed welding structure, the production of reasonable welding methods and welding process is to ensure that products