| 摘要: |
| 为了改善埋弧焊时焊接热输入较大,焊接接头力学性能存在的问题,研究了一种新型的采用直流脉冲电流的埋弧焊工艺——脉冲埋弧焊.以16MnR钢板为试验母材,研究了陡降外特性焊接电源匹配变速送丝系统的脉冲埋弧焊工艺对焊接接头力学性能的影响.结果表明,脉冲电弧力对熔池进行有规律的搅拌、振荡,震碎细化了晶粒,有效减小熔敷金属的成分偏析.脉冲埋弧焊可有效改善焊接接头的组织,细化晶粒,提高焊接接头的力学性能。 |
| 关键词: 脉冲 埋弧焊 热输入 力学性能 |
| DOI： |
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| Mechanical property analysis of welding joint made by pulsed submerged arc welding technology |
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WANG Zhanying1, LI Huan2, LIANG Jianming1, LIN Chundong1
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1.Department of Mechanical Engineering, Hebei Institute of Architecture and Civil Engineering, Zhangjiakou 075024, Hebei, China;2.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
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| Abstract: |
| To solve the disadvantages of mechanical properties of welded joint made by submerged arc welding(SAW)with high heat input, a new pulsed current SAW technology was put forward.The armor plate of 16MnR as the test material was chosen, and the effect of pulsed SAW by using sharp-fall output characteristics power source and varying-speed wire feeder on the mechanical properties of welded joint was investigated.The results of the experiments show that the pulsed arc force can refine the grain size and decrease the composition segregation of deposited metal by regular stiring and oscillating to welding puddle.The microstructures of welded joint by pulsed SAW can be obviously improved and the mechanical properties of welded joint can be increased. |
| Key words: pulse submerged arc welding heat input mechanical property |
