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超聲功率對7075鋁合金CMT焊接接頭的組織與性能的影響
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1.內(nèi)蒙古工業(yè)大學(xué);2.內(nèi)蒙古工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院

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內(nèi)蒙古自治區(qū)自然科學(xué)基金（項目號2020MS05066）


Effect of ultrasonic power on the organization and performance of 7075 aluminum alloy CMT welding joint
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    摘要:

    為了解決鋁合金接頭的氣孔多、晶粒粗大、力學(xué)性能差等問題，使用CMT焊接方法完成對7075鋁合金薄板的焊接，在焊接過程中引入超聲波。通過金相、EBSD、力學(xué)性能等測試考察了不同超聲功率對焊接接頭氣孔、微觀結(jié)構(gòu)和力學(xué)性能的影響。結(jié)果表明，超聲振動可以顯著的減小氣孔數(shù)量、增加熔寬，并且其HAZ的寬度隨超聲功率的增加而減?。怀暪β蕿?200W時焊接接頭顯微硬度較無超聲提高8.93HV，抗拉強度提高85MPa，斷后伸長率提高1.4%。由EBSD結(jié)果分析可知，當(dāng)超聲功率為1200W時焊縫平均晶粒尺寸36.89μm，比未施加超聲時減小了9.99μm，焊縫晶粒得到了明顯細化；隨著超聲功率的增加提高了晶粒的大角度晶界的比例，焊接接頭的塑性有所增加。

    Abstract:

    In order to solve the problems of large stomata， coarse grain and poor mechanical properties of the aluminum alloy joints， the welding of the 7075 aluminum alloy thin sheet was completed by using the CMT welding method， and the ultrasonic wave was introduced in the welding process.The influence of different ultrasonic power on welded joint stomata， microstructure and mechanical properties were investigated by gold phase，EBSD，and mechanical properties.The results show that ultrasonic vibration can significantly reduce the number of stomata and increase the melting width， and the width of HAZ decreases with the microhardness of welding joints at 1200W by about 8.93HV， tensile strength 5by about 85MPa and fracture elongation by 1.4%.According to EBSD results， the average grain size of the weld was 36.89 μm when the ultrasonic power is 1200W，9.99 μm and the large angle boundary ratio of the welding joint to some extent.

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李銳峰,陳芙蓉.超聲功率對7075鋁合金CMT焊接接頭的組織與性能的影響[J].稀有金屬材料與工程,2023,52(1):274~282.[liruifeng, chenfurong. Effect of ultrasonic power on the organization and performance of 7075 aluminum alloy CMT welding joint[J]. Rare Metal Materials and Engineering,2023,52(1):274~282.]
DOI：10.12442/j. issn.1002-185X.20211105

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  • 收稿日期:2021-12-12
  • 最后修改日期:2022-03-31
  • 錄用日期:2022-04-25
  • 在線發(fā)布日期: 2023-02-13
  • 出版日期: 2023-02-08