MH600DP与MH540FB双相钢MAG焊焊接性研究

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摘要：通过碳当量和冷裂纹敏感系数计算，以及硬度、金相组织检测等试验方法，对汽车轮辐和轮辋用钢热轧马氏体双相钢MH600DP和贝氏体双相钢MH540FB的焊接性，以及MAG焊角接接头焊缝组织、显微硬度分布进行了研究。研究成果具有一定的现实意义和应用价值。

关键词：双相钢；MAG焊；显微组织；显微硬度

Research on the weldability of MH600DP and MH540FB dual phase steel by MAG welding

WU Xinghuan1， LAI Chunming1， PENG Sihan2

1.School of Mechanical Engineering， Hunan Chemical Vocational and Technical College， Zhuzhou 412000， Hunan， China

2.CRRC Zhuzhou Electric Locomotive Co.， Ltd.， Zhuzhou 412000， Hunan， China

Abstract： Investigates the weldability of hot-rolled martensitic dual-phase steel MH600DP and bainitic dual-phase steel MH540FB for automotive wheel spokes and rims through calculations of carbon equivalent， cold cracking sensitivity coefficient， hardness， and metallographic analysis. The research includes the study of MAG welded butt joint weld seam structure and microhardness distribution. The research findings have certain practical significance and application value.

Keywords： dual-phase steel; MAG welding; microstructure; microhardness

1 序言

为了实现“碳达峰”这个宏伟目标，就要求汽车提高燃油效率并减少尾气排放。（剩余3745字）