【摘要】：一脈一滴的熔滴過渡被廣泛認為是脈沖熔化極惰性氣體保護焊中最好的過渡形式,通過在方波脈沖的峰值后增加一個后中值脈沖能有效增強熔滴過渡的可控性,提高焊接過程穩(wěn)定性和焊縫成形效果.文中利用小波分析儀采集焊接過程瞬時電流電壓信號,經過分析得到電流-電壓分布概率和U-I圖,并將兩者與焊縫外觀相結合一起綜合評定焊接效果.1.2 mm鋁合金ER4303焊絲焊接實驗表明:在平均電流不變的情況下,采用后中值脈沖波形焊接能明顯提高焊縫成形的質量,在焊縫表面形成規(guī)整的魚鱗紋;中值電流取值太小,控制熔滴過渡的作用不明顯,只是相當于增加了基值時間;取值太大,相當于增加了峰值時間,焊接過程不穩(wěn)定;后中值時間太短,能量積累不夠,不能控制熔滴過渡;時間太長容易造成熔滴過渡不規(guī)則,焊縫的魚鱗紋消失;后中值電流時間取值在6~10 ms范圍內,取值在強弱脈沖電流平均值左右時,焊接過程穩(wěn)定,焊縫魚鱗紋光亮、規(guī)整、美觀.
[Abstract]:The droplet transfer from pulse to drop is widely regarded as the best transition form in pulsed inert gas welding. By adding a back median pulse after the peak of square wave pulse, the controllability of droplet transfer can be effectively enhanced. Improve the stability of welding process and weld forming effect. In this paper, the instantaneous current and voltage signals of welding process are collected by wavelet analyzer, and the probability of current-voltage distribution and U-I diagram are obtained by analysis. The welding experiment of ER4303 wire of 1.2 mm aluminum alloy combined with the welding appearance shows that the welding quality of the weld can be improved obviously by using the posterior median pulse waveform welding under the condition of constant average current. The median current is too small to control the droplet transfer, which is only equivalent to the increase of the base value time, the value is too large, equivalent to increase the peak time, the welding process is unstable, the value is too large, the value is too small, the effect of controlling droplet transfer is not obvious, the value is too large, the value is equivalent to increase the peak time, the welding process is unstable; The second median time is too short and the energy accumulation is not enough to control the droplet transfer, the time is too long to make the droplet transition irregular and the scale of weld seam disappear, the time of the posterior median current is within the range of 6 ~ 10 ms. When the value is about the average value of the strong and weak pulse current, the welding process is stable, the welding seam scales are bright, regular and beautiful.
【作者單位】： 華南理工大學機械與汽車工程學院;
【基金】：廣東省科技計劃項目(2013B090600098) 廣東省教育部產學研結合項目(2011B090400261) 黃埔區(qū)科技計劃資助項目(201341) 廣東省特派員工作站項目(2010B090500008) 佛山市科技計劃項目(2011AA100175)~~
【分類號】：TG457.14

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本文編號：2224560