旋转摩擦焊接头焊合机理研究

发布时间：2018-06-17 06:36

本文选题：金属材料 + 焊合机理　；参考：《材料研究学报》2017年04期

【摘要】：以Q235低碳钢为母材,研究了摩擦时间和顶锻压力对旋转摩擦焊接头焊合率和冶金质量的影响规律并分析了接头焊合机理。结果表明,不同焊接参数下已焊合区域的拉伸强度基本相同且均大于或等于母材强度,焊接参数影响的只是接头焊合率(焊合率:接头横截面焊缝焊合部分长度与总长度之比),因此提出将焊合率作为焊接质量的评价标准。进一步研究表明,在其他参数不变的情况下,焊合率随顶锻压力的增大而增大,但增大速率逐渐趋缓,当顶锻压力达到某临界值后,焊合率达到100%,对所需临界压力进行了分析并得出了其计算方法;随着摩擦时间的增加,轴向缩短量增大,焊合率减小,焊接界面温度升高,高温区变宽,焊后再结晶区域加宽且晶粒尺寸变大。近缝区组织呈流线状,且晶粒大小不均匀。最终得出,大顶锻压力,短摩擦时间有助于提高焊合率,减小晶粒尺寸小,提升接头整体质量。
[Abstract]:Taking Q235 low carbon steel as base material, the influence of friction time and top forging force on welding rate and metallurgical quality of rotating friction welding joint was studied and the welding mechanism of joint was analyzed. The results show that the tensile strength of the welded zone is basically the same and the tensile strength is greater than or equal to that of the base metal under different welding parameters. Welding parameters only affect the welding ratio (welding ratio: the ratio of weld length to total length of the cross section weld seam). Therefore, the weldability is regarded as the evaluation standard of welding quality. Further study shows that the welding bonding rate increases with the increase of the forging pressure, but the increasing rate gradually slows down, when the top forging force reaches a certain critical value, the welding bonding ratio increases with the increase of other parameters. The critical pressure required is analyzed and its calculation method is obtained. With the increase of friction time, the axial shortening increases, the welding bonding rate decreases, the welding interface temperature increases, and the high temperature zone becomes wider. After welding, the recrystallization area is widened and the grain size is enlarged. The microstructure near the seam is streamline, and the grain size is not uniform. Finally, it is concluded that large forging pressure and short friction time are helpful to improve the welding bonding rate, reduce the grain size and improve the overall quality of the joint.
【作者单位】：西北工业大学凝固技术国家重点实验室;西北工业大学摩擦焊接陕西省重点实验室;
【基金】：国家自然科学基金(51575451,51475376)~~
【分类号】：TG453.9

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