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首页> 外文期刊>International Journal of Precision Engineering and Manufacturing >Microstructure, Mechanical Properties and Failure Mechanisms of Resistance Spot Welding Joints between Ultra High Strength Steel 22MnB5 and Galvanized Steel HSLA350
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Microstructure, Mechanical Properties and Failure Mechanisms of Resistance Spot Welding Joints between Ultra High Strength Steel 22MnB5 and Galvanized Steel HSLA350

机译：超高强度钢22MnB5与镀锌钢HSLA350之间的电阻点焊接头的组织，力学性能和破坏机理

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摘要

Resistance spot welding of 22MnB5/HSLA350 and its weldability are investigated. From base material to the nugget, the microstructure of 22MnB5 side can be expressed as M/tempered M+ granular carbides/F+W/fine M/lath M, and on HSLA350 side, F+M/F+flocculent P+tempered M/F+flocculent P+M/F+M/lath M are observed. The heat-affected zone (HAZ) of 22MnB5 exhibits obvious softening region and strengthening region caused by the tempered M and quite fine M, respectively. The peak load of welded joints undergoes two stages of a dramatic increase and a subsequent decrease with increases in the welding current. The maximum value (13.82 kN) of peak load is achieved at a welding current of 8 kA. The failure modes involving interfacial failure (IF), pullout failure from the galvanized steel (PFG), pullout failure from boron steel and tearing of the galvanized steel (PFB-TG) and pullout failure from the boron steel (PFB) are discussed in detail.
机译：研究了22MnB5 / HSLA350的电阻点焊及其可焊性。从基础材料到熔核，22MnB5侧面的微观结构可以表示为M /回火M +颗粒状碳化物/ F + W /细M /板条M，而在HSLA350侧面，F + M / F +絮凝剂P +回火M /观察到F +絮凝剂P + M / F + M /板条M。 22MnB5的热影响区（HAZ）分别表现出明显的软化区和强化区，分别由回火的M和相当细的M引起。随着焊接电流的增加，焊接接头的峰值载荷经历了两个阶段的急剧增加和随后的降低。焊接电流为8 kA时，峰值负载达到最大值（13.82 kN）。详细讨论了界面破坏（IF），镀锌钢板的拉拔破坏（PFG），硼钢的拉拔破坏和镀锌钢的撕裂（PFB-TG）以及硼钢的拉拔破坏（PFB）的失效模式。 。

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