通过对焊接接头的力学性能检验、微观组织观察和分析，证明了该焊接工艺的可行性。
The mechanical property of weld joint was tested and the microstructure was analysed, the welding process was proved feasible.
微观组织观察表明，在锻造或高温轧制状态下获得了以低碳马氏体为主，含少量贝氏体和残余奥氏体的复合组织。
Observations showed that the micro-structure of the steel after forging or high temperature rolling was composed of low-carbon martensite, a little part of bainite and residual austenite.
经分析与实体零件的宏观与微观组织观察，此现象是因为还原介质渗入，引起合金体积膨胀而产生引力，造成应力裂纹。
Being the reducing medium, the volume expansion of alloy brings gravitation and crack through analysis and observation of accessory's macro-and micro structure.
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