| 摘要: |
| 通过采用 MAG 熔焊方法并选择合适的高强钢焊丝，进行 1700MPa 级超高强钢和 Q550D 高强钢板的异种焊接，得出了最佳焊接工艺参数，并对焊接机头进行了组织及力学性能试验。结果表明，异种焊缝组织主要由羽毛状的下贝氏体组成，在焊态焊缝组织中没有发现马氏体组织；而在 1700MPa 级超高强钢的熔合线附近一侧，发现大量沿熔合线垂直生长的板条马氏体组织；力学性能测试表明，焊接接头性能满足生产使用要求，为超高强钢的应用提供了试验依据。 |
| 关键词: 1700MPa级超高强钢 Q550D高强钢 MAG焊 组织性能 |
| DOI： |
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| Research on the microstructure and properties of dissimilar joints between 1700MPa grade ultra-high strength steel and Q550D high strength steel |
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Chunbai Liu1, Mingwen Zhou1, Min Liu1, Ti Zhao1, Xvteng Lv2
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1.China First Automobile Group Corporation;2.Harbin Institute of Technology
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| Abstract: |
| By using MAG fusion welding method and selecting appropriate high-strength steel welding wires, the optimal welding process parameters were obtained for dissimilar welding of 1700MPa grade ultra-high strength steel and Q550D high-strength steel plate. The microstructure and mechanical properties of the welding head were tested. The results show that the microstructure of dissimilar welds is mainly composed of feathery lower bainite, and no martensite structure was found in the welded weld microstructure; On the side near the fusion line of 1700MPa grade ultra-high strength steel, a large amount of Flat noodles martensite was found growing vertically along the fusion line; Mechanical performance tests have shown that the performance of welded joints meets production and usage requirements, providing experimental basis for the application of ultra-high strength steel. |
| Key words: 1700MPa grade ultra-high strength steel Q550D high-strength steel MAG welding Organizational performance |
