我公司使用的ＷＫ－４型电动挖掘机是由太原重型机械厂制 造的，已使用１０余年。近２年，拉紧方轴时常发生断裂（断裂部位如图１所示的Ａ－Ａ处）。更换新轴需３．７万元，且外购备件耗时较长，如果短期内能修复使用，既为生产赢得时间，又能节省大量资金。现将本公司修复方法 WK-4 electric excavator used by our company is manufactured by Taiyuan Heavy Machinery Factory and has been used for more than 10 years. Nearly two years, tense square shaft often fracture (fracture site shown in Figure 1 A-A Department). Need to replace the new shaft 37,000 yuan, and the purchase of spare parts takes a long time, if the short-term repair can be used, both for the production to win the time, but also save a lot of money. Now the company repair method