本文選題：脈沖旁路耦合電弧 + 熔化極惰性氣體保護(hù)焊��； 參考：《機(jī)械工程學(xué)報(bào)》2015年20期

【摘要】：脈沖旁路耦合電弧熔化極惰性氣體保護(hù)(Metal inert-gas,MIG)焊是一種新型的低熱輸入焊接方法,它通過特定的接法引入旁路電弧與主路電弧實(shí)現(xiàn)熱、力的耦合,利用旁路電弧的分流作用,實(shí)現(xiàn)熔化母材熱量與熔化焊絲熱量的獨(dú)立控制,從而在精確控制母材熱輸入的同時(shí)保證熔滴的自由過渡形式,可以實(shí)現(xiàn)鋁-鋼等異種金屬的連接。為了理論分析不同焊接參數(shù)對焊接過程的影響,通過等效、線性化處理與迭代數(shù)值求解算法,建立可以正確描述焊接物理過程的動(dòng)態(tài)數(shù)學(xué)解析模型;針對焊接過程中耦合電弧穩(wěn)定性較差且直接影響焊接質(zhì)量的問題,提出通過檢測弧壓波動(dòng)的反饋信號、實(shí)時(shí)調(diào)節(jié)送絲速度、進(jìn)而控制耦合電弧穩(wěn)定性的閉環(huán)控制方案,并基于快速原型系統(tǒng)進(jìn)行焊接過程控制仿真與試驗(yàn)。仿真結(jié)果表明,當(dāng)焊接過程受到干擾后,采用閉環(huán)控制方案可以顯著提高耦合電弧的穩(wěn)定性;焊接試驗(yàn)證明了控制仿真的預(yù)測與分析,進(jìn)行閉環(huán)控制后,焊接過程更加穩(wěn)定同時(shí)得到了成形良好的鋁-鋼異種金屬接頭。
[Abstract]:Pulsed Bypass coupled Arc Metal inert-gas shielded metal inert-gas MIG welding is a new type of low-heat input welding method, which introduces bypass arc and main arc to realize heat and force coupling through a specific method, and utilizes shunt effect of bypass arc. The heat of melting base metal and welding wire can be controlled independently, which can control the heat input of base metal accurately and ensure the free transition form of droplet, and the connection of dissimilar metals such as aluminum and steel can be realized. In order to theoretically analyze the influence of different welding parameters on welding process, a dynamic mathematical analytical model which can accurately describe the welding physical process is established by equivalent, linearization and iterative numerical solution algorithm. Aiming at the problem that the stability of coupling arc is poor and the welding quality is affected directly, a closed-loop control scheme is put forward to control the stability of coupling arc by detecting the feedback signal of arc voltage fluctuation and adjusting the wire feeding speed in real time. The welding process control simulation and test are carried out based on the rapid prototyping system. The simulation results show that when the welding process is disturbed, the stability of the coupling arc can be significantly improved by using the closed-loop control scheme, and the prediction and analysis of the control simulation are proved by the welding experiment, and the closed-loop control is carried out. The welding process is more stable and a well formed aluminum-steel dissimilar metal joint is obtained.
【作者單位】： 蘭州理工大學(xué)省部共建有色金屬先進(jìn)加工與再利用國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：973計(jì)劃前期研究專項(xiàng)(2014CB660810) 國家自然科學(xué)基金(51165023) 蘭州理工大學(xué)紅柳杰出青年教師培養(yǎng)計(jì)劃 甘肅省自然科學(xué)基金資助項(xiàng)目
【分類號】：TG444.74

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本文編號：1914239