铝合金脉冲MIG焊接熔滴过渡行为的声发射信号时频域表征

发布时间：2018-05-16 04:03

  本文选题：脉冲MIG焊 + 熔滴过渡　； 参考：《焊接学报》2015年04期

【摘要】：通过在线检测铝合金脉冲MIG焊接过程的结构负载声发射信号,研究熔滴过渡模式和行为的时频域表征.结果表明,熔滴过渡声发射信号波形以及熔滴过渡声发射事件的有序性和周期性可以反映脉冲MIG焊接过程熔滴过渡的稳定性和周期性.随着脉冲频率和焊接热输入的增大,熔滴过渡模式由短路过渡转变为射滴过渡,过渡熔滴体积得到逐步细化,表现出递减的声发射能量释放特征.当熔滴过渡为短路过渡模式时,熔滴过渡声发射信号的频域范围较宽,且较为集中在高频部分;当熔滴过渡为射滴过渡模式时,熔滴过渡声发射信号的频率分布范围更窄,且集中在低频部分.随着熔滴过渡模式由短路过渡模式逐渐转变为射滴过渡模式,由熔滴过渡引入的能量变化呈现出先减小再增大的趋势.
[Abstract]:The mode and behavior of droplet transfer were investigated in time-frequency domain by on-line detecting the structural load acoustic emission signals of aluminum alloy pulsed MIG welding process. The results show that the waveform of droplet transfer acoustic emission signal and the order and periodicity of droplet transfer acoustic emission events can reflect the stability and periodicity of droplet transfer during pulsed MIG welding. With the increase of pulse frequency and welding heat input, the transfer mode of droplet is changed from short-circuit to emitter, and the volume of transition droplet is gradually refined, showing the characteristic of decreasing AE energy release. When the droplet transfer is in short-circuit mode, the frequency range of droplet transfer acoustic emission signal is wider, and the frequency distribution range of droplet transfer acoustic emission signal is narrower when the droplet transfer mode is droplet transfer mode. And concentrated in the low frequency part. With the transition of droplet transfer from short-circuit transfer mode to droplet transfer mode, the energy change introduced by droplet transfer shows a trend of first decreasing and then increasing.
【作者单位】： 重庆理工大学材料科学与工程学院;重庆市特种焊接材料与技术高校工程研究中心;
【基金】：重庆市教委科学技术研究项目(KJ1400930) 重庆市高等学校青年骨干教师资助计划 特种焊接材料与技术重庆市高校工程研究中心开放课题基金资助(SWMT201501)
【分类号】：TG441.7

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中国期刊全文数据库 前3条

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