3．4m减速机大模数齿轮的补焊修复

Repair welding of the gear with large module for 3.4m speed reducer

中板轧机３．４ｍ大型减速机的中速齿轮轴使用寿命很短，报废一根齿轮轴不仅经济损失很大，而且备件供应紧张，柳钢采用补焊的办法修复损坏的齿轮轴，经使用效果很好。

The mid shaft of 3.4m speed reducer for a plate mill has a short service life. The wastage of the shaft causes not only great economic decrease but also shortage of the spare supplied.The technique of repair welding was used for rebuilding the shaft in Liuzhou Iron and Steel Co.and good effects were achieved.This paper introduces the processes of repairing the gear shaft.