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超声振动辅助E40钢水下湿法焊接组织与性能 被引量:6

Microstructure and mechanical properties of underwater wet welded joint of E40 ship plate steel subjected to ultrasonic vibration
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摘要 文中针对常规水下湿法焊接过程中焊缝力学性能低的问题,设计了超声振动辅助水下湿法焊接的方法.通过超声辐射端将超声振动能量施加在电弧前方的待焊区域,进而通过工件将超声能量传递到熔池中,对比研究了超声振动对焊缝成形、微观组织及力学性能的影响.结果表明,超声振动能够减小焊缝截面不对称,增加焊缝深宽比,使熔池发生强烈的搅拌作用,具有细化晶粒的作用,并降低熔合区处柱状结晶的倾向.与常规水下湿法焊接相比,超声振动辅助水下湿法焊接抗拉强度明显提高,达到母材的92.4%;焊缝区显微硬度升高,热影响区硬度值变化较小. To improve the lower mechanical property in E40 steel joints obtained by conventional underwater wet welding,this article presents a novel underwater wet welding method through applying ultrasonic vibration to the work piece in front of the welding pool. The effect of ultrasonic vibration on the weld formation,microstructure and mechanical properties of underwater wet welded joint are investigated experimentally. The experimental results are compared with those by conventional underwater wet welding under the same welding conditions. The results show that ultrasonic vibration could reduce the asymmetry of weld cross-section,and enlarge the weld depth-to-width ratio. In addition,the grain refinement induced by ultrasonic vibration is usually related to the large instantaneous pressure and temperature fluctuations generated in the weld pool,which can increase the probability of nucleation and dendrite fragmentation,leading to grain refining in the weld metal during solidification,and lower tendency of column crystallization. Compared with conventional underwater wet welding,the tensile strength obtained by ultrasonic vibration assisted underwater wet welding is improved to some extent due to the introduced ultrasonic vibration,about92. 4% of the base metal. In addition,the microhardness in the weld zone is increased,while that in the heat affected zone has no obvious change. Therefore,it is supposed to be a good way to improve weld properties for underwater wet welding.
出处 《焊接学报》 EI CAS CSCD 北大核心 2018年第4期1-5,共5页 Transactions of The China Welding Institution
基金 国家重点研发计划资助项目(2016YFB0300602) 国家自然科学基金资助项目(51475104)
关键词 超声振动 水下湿法焊接 微观组织 力学性能 ultrasonic vibration underwater wet welding microstructure mechanical property
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