【摘要】：一脈一滴的熔滴過(guò)渡被廣泛認(rèn)為是脈沖熔化極惰性氣體保護(hù)焊中最好的過(guò)渡形式,通過(guò)在方波脈沖的峰值后增加一個(gè)后中值脈沖能有效增強(qiáng)熔滴過(guò)渡的可控性,提高焊接過(guò)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(guò)程瞬時(shí)電流電壓信號(hào),經(jīng)過(guò)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(jié)合一起綜合評(píng)定焊接效果.1.2 mm鋁合金ER4303焊絲焊接實(shí)驗(yàn)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(zhì)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(guò)渡的作用不明顯,只是相當(dāng)于增加了基值時(shí)間;取值太大,相當(dāng)于增加了峰值時(shí)間,焊接過(guò)程不穩(wěn)定;后中值時(shí)間太短,能量積累不夠,不能控制熔滴過(guò)渡;時(shí)間太長(zhǎng)容易造成熔滴過(guò)渡不規(guī)則,焊縫的魚鱗紋消失;后中值電流時(shí)間取值在6~10 ms范圍內(nèi),取值在強(qiáng)弱脈沖電流平均值左右時(shí),焊接過(guò)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(xué)機(jī)械與汽車工程學(xué)院;
【基金】：廣東省科技計(jì)劃項(xiàng)目(2013B090600098) 廣東省教育部產(chǎn)學(xué)研結(jié)合項(xiàng)目(2011B090400261) 黃埔區(qū)科技計(jì)劃資助項(xiàng)目(201341) 廣東省特派員工作站項(xiàng)目(2010B090500008) 佛山市科技計(jì)劃項(xiàng)目(2011AA100175)~~
【分類號(hào)】：TG457.14

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本文編號(hào)：2224560