不锈钢电弧铆焊焊点组织及力学性能
Microstructure and mechanical property of stainless steel joints with arc spot welding
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摘要: 采用电弧铆焊的方法对3 mm+5 mm厚的0Cr18Ni9不锈钢钢板采用搭接形式实现连接. 通过优化焊接电流及其作用时间的参数匹配，以期得到最佳的焊点显微组织和力学性能. 采用X射线检测焊点缺陷的存在，使用金相显微镜研究焊点熔深和熔核尺寸的变化，使用电子万能试验机测试焊点的抗剪力. 结果表明，电弧铆焊焊点呈蘑菇状，与基体圆滑过渡，成形良好，无气孔、裂纹等宏观缺陷. 随着第一段和第二段焊接电流的增大，焊点的熔深和熔核尺寸，及焊点抗剪力随之增大. 优化的工艺参数下，熔深尺寸可达4.07 mm，熔核尺寸可达7.73 mm，抗剪力可达23.654 kN，满足生产需求.
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关键词:
- 不锈钢|电弧铆焊|组织|抗剪力
Abstract: The arc spot welding was used to join 3 mm and 5 mm thick 0Cr18Ni9 stainless steel plates. Welding current and holding time were optimized to get the best match between the microstructure and mechanical properties. The welding defects, microstructures and mechanical properties were analyzed by X-Ray detection, optical microscopy (OM) and electronic universal testing machine, respectively. The results showed that the joints by arc spot welding presented a mushroom shape, which smoothly transited with the substrate, while no holes, cracks and other macro defects were observed. The weld penetration and nugget diameter, and shear resistance stress of the joints increased with the first and second currents. Under the optimized parameters, the weld penetration, nugget diameter and shear resistance stress respectively reached 4.07 mm, 7.73 mm and 23.65 kN, which satisfied the demands of the production. -
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