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研究厚度为1.5 mm的国产超高强度热成形钢板B1500HS与低碳钢板H220PD+Z100MB的电阻凸焊,对比分析了不同焊接电流、焊接时间、电极压力下其焊接接头的力学性能及微观组织。结果表明:其最佳焊接工艺为在电极压力为3.5 kN、焊接时间为25 cyc下,焊接电流为8.2~11.7 kA;无论是热成形钢还是低碳钢侧,熔核均为板条状马氏体组织,强度、硬度高;接头横截面从热成形到低碳钢,其维氏硬度曲线呈现由高到低的变化趋势;超高强热成形钢板与低碳钢板凸焊,应以熔核的尺寸(熔核直径及熔深)作为接头质量的主要评价指标,而原标准中的最小拉剪强度指标则作为最低标准。
The resistance welding of B1500HS and H220PD + Z100MB low density steel was studied. The mechanical properties and microstructure of the welded joint under different welding current, welding time and electrode pressure were analyzed. The results show that the optimum welding process is the welding current is 8.2 ~ 11.7 kA at the electrode pressure of 3.5 kN and the welding time of 25 cyc. The nuggets are lath-like horseshoe And the Vickers hardness curve shows a trend from high to low. The ultra-high-strength thermoformed steel plate and the low-carbon steel plate are convexly welded, and should be made of nugget The size (nugget diameter and penetration) as the main quality evaluation of the joint index, while the original standard minimum tensile shear strength index as a minimum standard.