由于焊接结构件有重量轻、强度高、外形平整美观等特点,因而引起机械结构发生了重大的变化。焊接件逐步代替了铸、锻件,或采用铸焊联合结构等,尤其在重型机械制造中,焊接件比重已愈来愈大,如锻造设备的床身,立柱,大型减速机的壳体和大型齿轮,以及破碎机机壳等 Due to the welding structure has the characteristics of light weight, high strength, smooth and beautiful appearance, which led to a significant change in the mechanical structure. Welding parts to gradually replace the castings, forgings, or cast-welded joint structure, especially in heavy machinery manufacturing, the proportion of welded parts has become increasingly larger, such as forging equipment bed, column, large reducer shell and large Gears, crushers and other chassis