在吊装和翻动大型机件时,一般是利用杆杠、叉型支架和桥式起重机等机械来代替人工劳动。在成批生产大型焊接环件时,吊装机械化的问题很棘手,因为它们通常是加工毛坯拼装而成的,拼装的组合件重达10～130吨,焊接断面0.55至0.675平方米。制造焊接环件的生产过程在标准情况下由下述工序组成:把所要拼装的 In lifting and turning large parts, the general use of bar, fork brackets and overhead cranes and other machinery to replace manual labor. The problem of hoisting mechanization is a thorny problem in mass-producing large-scale welded rings because they are usually fabricated from assembled blanks that weigh 10 to 130 tons and weld sections of 0.55 to 0.675 square meters. The manufacturing process for manufacturing the welding ring consists of the following steps under standard conditions: