求翻译：本文主要通过显微金相试验、拉伸试验、维氏显微硬度试验、冲击试验和疲劳试验来对转向架用钢的焊接接头试样进行力学性能测试。金相试验观察焊接接头的显微组织的组成；拉伸试验测得焊接接头的屈服强度和抗拉强度；维氏显微硬度试验测得焊接接头不同部位的维氏硬度；冲击试验得出焊接接头不同区域的冲击功及冲击韧度；疲劳试验测得焊接接头的疲劳性能和疲劳极限。是什么意思？

This paper mainly through microscopic metallographic test, tensile test, the Vickers hardness test, impact test and fatigue test of the bogie steel welded joint specimens for mechanical properties testing. The Metallographic observed the composition of the microstructure of welded joints; tensile te

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