求翻译：本文主要通过显微金相实验、拉伸实验、维氏显微硬度实验、冲击实验和疲劳实验对转向架所用的原始母材试样与焊接钢件试样进行对比。通过不同力学性能之间的对比得出焊接后的试样与原始母材试样的差别。是什么意思？

Microscopy metallographic, tensile testing, the Vickers hardness test, impact test and fatigue test on the bogie used in the original base metal specimens and welded steel specimen contrast. Difference on the contrast between the different mechanical properties of the sample with the original base m

This article is by microscopic metallographic laboratory, tensile testing, D&B micro-hardness testing, impact testing and fatigue testing of the knee with a sample of the original parent material and welded steel samples for comparison. Through different mechanics performance welding that the co

This article mainly through the micro metallography experiment, the stretch experiment, the Uygur microhardness experiment, the impact experiment and the weary experiment the primitive parent metal test specimen and the welding steel stock test specimen which uses to the bogie carries on the contras

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