The Effect of Ultrasonic Vibration on Properties of Weld Metal
The Effect of Ultrasonic Vibration on Properties of Weld Metal
复制标题
超声波振动对焊缝金属性能的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
B. Poopat
中科院分区：
文献类型：
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作者：
Titinan Methong;B. Poopat
焊缝金属的力学性能和材料的焊接性与焊缝金属的微观组织密切相关。为了改善焊件的显微组织，人们进行了大量的研究，如利用磁弧振荡和电弧脉动进行熔池搅拌。本文利用超声振动效应来改善焊缝金属的凝固状态，改善焊缝金属的微观组织。研究了碳钢焊缝金属(ER70S-G焊料)的组织和力学性能。在水冷铜模中采用钨极气体保护焊(GTAW)熔化填充金属。在焊缝金属凝固过程中，施加频率为20 kHz的超声波振动。将焊缝金属的组织和力学性能与常规焊缝金属(无超声振动)进行了比较。用扫描电子显微镜(SEM)分析了高倍率下的显微组织和物相组成。结果表明，在凝固过程中施加超声波振动，可以促进焊缝金属的细化。焊缝金属的力学性能显著提高，显微组织分析与力学性能测试结果具有较好的相关性。
Weld metal mechanical properties and weldability of materials are closely related to the microstructure of the weld metal. A significant amount of research has been studied to improve microstructure of weldments such as weld pool stirring by using magnetic arc oscillation and arc pulsation. In this work, the effect of ultrasonic vibration was used to modify weld metal solidification to improve microstructure of the weld metal. Microstructure and mechanical properties of carbon steel weld metal (ER70S-G filler metal) were studied. Filler metal was melted by using Gas Tungsten Arc Welding (GTAW) in a water-cooled copper mold. Ultrasonic vibration with a frequency of 20 kHz was applied during solidification of the weld metal. Microstructure and mechanical properties of weld metal were compared with those of conventional weld metal (no ultrasonic vibration assistance). Scanning Electron Microscopy (SEM) was also used to determine microstructure and phases at high magnification. The results showed that ultrasonic vibration applied during solidification promoted grain refinement in the weld metal. Mechanical properties of weld metal were improved significantly, microstructure analysis correlated well with the mechanical test results.