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首页> 外文期刊>Research Disclosure >In-Situ Surface Ablation to Mitigate Liquid Metal Embrittlement Cracking In Resistance Welding of Galvanized Steels
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In-Situ Surface Ablation to Mitigate Liquid Metal Embrittlement Cracking In Resistance Welding of Galvanized Steels

机译：原位表面烧蚀可减轻镀锌钢电阻焊接中的液态金属脆化裂纹

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摘要

It is known that when zinc coated steel components (e.g., galvanized or galvannealed) are welded, liquid zinc which melts at approximately 400℃ interacts with the steel, which together with the strains and stresses from heat-up and cool-down of the workpieces occurring during resistance welding can cause liquid metal embrittlement (LME) cracking. Thus, it is essential that a method to mitigate LME cracking in welding (e.g., resistance, laser, arc...etc.) of galvanized steel components be developed. A method of surface ablation (e.g., laser, plasma...etc.) to remove Zn completely or partially at the regions where LME cracking is formed while leaving enough Zn to retain sound corrosion performance prior to welding is proposed. The removal of Zn element on the surfaces of the workpieces reduces the propensity of molten Zn penetrating into the grain boundaries of austenite, and consequently LME cracking is mitigated in welding of galvanized steel. This method would enable the automotive industry to implement galvanized high strength steels for vehicle lightweighting.
机译：众所周知，当焊接镀锌钢部件（例如，镀锌或镀锌）时，在大约400℃熔化的液态锌与钢相互作用，这与工件加热和冷却产生的应变和应力一起在电阻焊接过程中发生的腐蚀会导致液态金属脆化（LME）破裂。因此，必须开发一种减轻LME在镀锌钢部件的焊接（例如电阻，激光，电弧等）中开裂的方法。提出了一种表面烧蚀（例如激光，等离子等）方法，该方法在形成LME裂纹的区域完全或部分去除Zn，同时在焊接之前保留足够的Zn以保持良好的腐蚀性能。工件表面上锌元素的去除降低了熔融锌渗入奥氏体晶界的倾向，因此，在镀锌钢的焊接中减轻了LME裂纹。该方法将使汽车工业能够实现用于车辆轻量化的镀锌高强度钢。

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    《Research Disclosure》 |2019年第662期|598-598|共1页
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