| 低合金高强钢激光-MAG复合多层焊接头力学性能 |
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| 引用本文： | 秦浩,雷正龙,陈彦宾,冯杰才,李颖.低合金高强钢激光-MAG复合多层焊接头力学性能[J].中国激光,2011(10). |
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| 作者姓名： | 秦浩 雷正龙 陈彦宾 冯杰才 李颖 |
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| 作者单位： | 哈尔滨工业大学先进焊接与连接国家重点实验室; |
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| 基金项目： | 中国博士后科学基金项目(20090460885)资助课题 |
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| 摘 要： | 在对16 mm厚11CrNi3MnMoV低合金高强钢采用激光-熔化极活性气体保护焊(MAG)复合多层焊技术实现可靠连接的基础上,对焊缝和母材的硬度、拉伸、冲击性能进行分析,并从断口特征方面对其断裂原因和机制进行研究。结果表明,焊缝抗拉强度达到817 MPa,比母材高13%,其断口韧窝相对细小均匀,而母材断口的粗大韧窝明显多于焊缝,表明焊缝强度高,母材韧性好。冲击试验中随着温度降低,母材冲击功保持稳定,而焊接接头冲击功逐渐减小,-40℃左右发生延-脆性转变。焊缝断口主要存在韧性断裂区和脆性断裂区,而母材只存在韧性断裂区。
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| 关 键 词： | 激光技术 低合金高强钢 激光-MAG复合 多层焊 力学性能 |
Mechanical Properties of Laser-MAG Hybrid Welding on Low Alloy High Strength Steel |
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| Qin Hao Lei Zhenglong Chen Yanbin Feng Jiecai Li Ying.Mechanical Properties of Laser-MAG Hybrid Welding on Low Alloy High Strength Steel[J].Chinese Journal of Lasers,2011(10). |
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| Authors: | Qin Hao Lei Zhenglong Chen Yanbin Feng Jiecai Li Ying |
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| Affiliation: | Qin Hao Lei Zhenglong Chen Yanbin Feng Jiecai Li Ying (State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,Heilongjiang 150001,China) |
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| Abstract: | A low alloy high strength steel(11CrNi3MnMoV) of 16 mm in thickness is well joined by laser-metal active gas(MAG) hybrid welding and the hardness,tensile and impact properties of weld seam and base metal are analyzed,respectively.Furthermore,the fracture mechanism is investigated through fractography.The results of the tensile test indicate that the strength of weld seam is about 817 MPa,which is 13% higher than that of base metal.The dimples in the fracture of weld seam are fine and uniform,whereas that of... |
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| Keywords: | laser technique low alloy high strength steel laser-MAG hybrid multi layer welding mechanical properties |
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