一、氩弧焊的提出与效果 (一)锡焊电机所带来的弊病东风_4型内燃机车410牵引电动机,由于制造、检修、运用及保养诸方面的因素,使电机故障仍占机车总故障的20～25％。可喜的是由于厂、段共同努力,故障率逐年有所下降(1981年度占18.9％),备品完好率逐年提高。从目前故障分类看:主、附极接地仍占首位,环火 First, the proposed and effect of argon arc welding (A) the shortcomings brought by soldering motor Dongfeng _4 diesel locomotive 410 traction motor, due to manufacturing, maintenance, use and maintenance of various aspects of the motor failure is still accounted for the total Failure of 20 to 25%. It is gratifying to note that due to the joint efforts of factories and sections, the failure rate has decreased year by year (18.9% in 1981), and the rate of spare parts improvement has been increasing year by year. Judging from the current breakdown of the classification: the main, with the grounding still occupy the first place, Central Fire