介绍了用真空电子束焊接大型客车后桥壳半轴的工艺方法，并就焊接过程中存在的主要问题进行了分析。
The process of vacuum electron beam welding for rear-axle housing semiaxis of coach was introduced and the major problems in the process of welding was analysed.
后桥与车轮相连，内端装有一个半轴齿轮。
The rear axles are attached to the wheels and have bevel side gears on their inner ends.
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