对ZK14— 9/ 550型电机车车轴断裂的原因进行分析，并采取改进措施，确保了电机车的安全运行。

This paper analysed the reason of axle's break in the ZK14—9/550 electric locomotive, and takes improvement measures, ensures safety of the electric locomotive to move.

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他把断裂的车轴焊接起来。

He welded the pieces of a broken axle.

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试验研究了LZ 50车轴钢的断裂韧度的合理统计模型。

Experimental study is carried out to study the reasonable statistical model for the random fracture toughness data of LZ50 axle steel.

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