weld zone

By using thermo-simulation, Auger analysis and Charpy V impact test and with observation of the microstructures in which the cleavage crack initiated, the morphology and toughness of the local brittle zone of C-Mn and Cr-Ni-Mo multipass weld metals have been investigated.

以C-Mn，Cr-Ni-Mo手工多层焊缝为研究对象，采用示波冲击，俄歇分析，启裂源组织观察及热模拟实验，对薄弱环节组织的形态，韧性及对焊缝韧性的影响进行了研究。

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The microstructure of the weld zone is tempered martensite zone.

热影响区的显微组织主要为回火马氏体;熔合线结合良好,组织均匀.

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Crack propagation conducts alternatively between the weld zone and the partially molten zone, and is not strictly to rupture at W/ F boundary surface.

裂纹扩展在焊缝区和半熔化区之间交替进行，并非严格按W／F界面破断。

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Therefore, it is necessary to reasonably decreasing the cool rate after welding process for improving the ability of anti-fatigue crack initiation in the weld heat affected zone. 5.

因此在焊接时适当地降低热影响区的冷却速度，可以使焊接热影响区获得更优的抗疲劳裂纹萌生能力。

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Fracture toughness of heat-affected zone ( HAZ ) was between the base metal and weld metal.

焊接热影响区的断裂韧性介于母材和焊缝金属之间.

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The basic requirement of welding the steel 2205 is that the weld metal and heat-affected zone obtain a favorable phase balance and retain the performance as the base metal after welding.

平衡铁素体和奥氏体两相组织在焊缝金属和热影响区中的比例，保证焊接接头的性能，是双相不锈钢焊接的基本要求。

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The influence of weld heating on microstructure of heat affected zone was investigated in this paper.

探讨了焊接加热对热影响区组织的影响.

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Microscopic study of the bond in G zone of ni-sta in less steel explosive weld in G composite plate

镍-不锈钢爆炸复合板结合区的显微研究

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The results show that microstructure of weld zone greatly changes in the radial direction.

结果表明,焊缝组织沿径向有较大的变化.

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Based on the theory of thermal conductivity in weld zone and selection appropriate for weld type, a correct weld joint between cylindrical shell and its bottom head is designed. It is the efficient joint to prevent the oil cylinder from welding distortion.

根据焊接热传导的理论，选择适当的配合类别，设计出合理的缸体与缸底的焊接接头，可有效地防止缸体的焊接变形。

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