| 水下焊条电弧焊扩散氢含量及焊缝组织特征分析 |
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| 引用本文： | 程方杰,胡生辉,高文斌,邓彩艳,王东坡,荆洪阳.水下焊条电弧焊扩散氢含量及焊缝组织特征分析[J].焊接学报,2014,35(9):45-48. |
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| 作者姓名： | 程方杰 胡生辉 高文斌 邓彩艳 王东坡 荆洪阳 |
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| 作者单位： | 天津大学材料科学与工程学院;天津大学天津市现代连接技术重点实验室; |
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| 摘 要： | 对影响水下焊条电弧焊扩散氢含量的主要因素和焊缝组织进行分析研究.结果表明,电弧周围的水对焊缝增氢的贡献并不大,仅仅使扩散氢含量增加0.4%,扩散氢来源的主体是药皮中的结晶水和防水层材料所携带的H元素,分别使扩散氢含量增加12.1%和21.8%,工件表面的铁锈也是焊缝增氢的一个不容忽视的因素,会使扩散氢含量上升达28.2%.焊缝组织为少量的侧板条铁素体和贝氏体,热影响区(HAZ)则含有大量马氏体组织.其焊接接头的最高硬度一般都超过0.4 GPa,硬度峰值出现在熔合线附近,在焊缝热影响区内会形成典型的焊道下裂纹缺陷.
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| 关 键 词： | 水下焊接 水下焊条电弧焊 扩散氢 裂纹 |
| 收稿时间： | 2014/4/3 0:00:00 |
Diffusible hydrogen content and microstructure characteristic in the joint by underwater shielded metal arc welding |
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| CHENG Fangjie,HU Shenghui,GAO Wenbin,DENG Caiyan,WANG Dongpo and JING Hongyang.Diffusible hydrogen content and microstructure characteristic in the joint by underwater shielded metal arc welding[J].Transactions of The China Welding Institution,2014,35(9):45-48. |
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| Authors: | CHENG Fangjie HU Shenghui GAO Wenbin DENG Caiyan WANG Dongpo and JING Hongyang |
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| Affiliation: | School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China,School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China,School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China,School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China,School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | The main factors which affect the content of diffusible hydrogen and microstructure in the weld made by underwater shielded metal arc welding were analyzed. The results show that the water around the arc contributed little to the increase of diffusible hydrogen content which just increased about 0.41%. The main sources of diffusible hydrogen were organics or crystal water in the electrode covering and the waterproof layer, which increased the diffusion hydrogen content about 12.1% and 21.8%, respectively. In addition, the rust on the workpiece surface was not negligible for the increase of diffusible hydrogen content to about 28.2%. The microstructure in the welded metal consisted of bainite and a small amount of side plate ferrites, but the heat-affected zone contained a large amount of martensites.The highest hardness in the welded joint was over 4 GPa, and the hardness peak appeared near the fusion line. An under bead crack, typical cold crack, occurred in the heat-affected zone. |
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| Keywords: | underwater welding underwater shielded metal arc welding diffusible hydrogen crack |
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