协同控制双丝脉冲MAG焊电流配置对焊接特性及微结构的影响
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摘要
采用高速双丝熔化极活性气体保护电弧焊(MAG)焊方法对Q235板材进行焊接,研究了主/从焊丝所接焊接电源设置不同电流时对焊接接头组织与性能的影响。结果表明:电流的不同设置,影响焊缝区组织和热影响区(HAZ)微结构,并影响焊接接头强度和硬度。当主从丝电流设置成无差异时,双丝电极之间的电弧干扰最严重,电弧特性极其不稳定;随着双丝电极之间的电流差异增大,伴随微结构发生变化,热影响区域的硬度逐渐增大;当主从丝电流差值的绝对值继续增大到一定范围,热影响区域的硬度开始出现大幅减小,HAZ宽度增大。试验统计结果表明:在主从焊丝两路焊接电源采用反相位脉冲电流,主从焊丝被交替引燃,主丝焊接电流不大于从丝电流20 A时,电弧间干扰小,电弧稳定,可以得到理想的硬度,焊缝尺寸和微结构。
The welding of Q235 steel plates was carried out by anti-phase synchronized synergic-pulsed twin-wire MAG welding(MAG)method and the effect of the lead-trail wires welding currents in different configuration on properties and microstructure of the welded joints was investigated.The results show that the difference of the lead-trail welding currents affects the microstructure,strength and hardness of the welded joints.When there is no difference between the lead-trail welding currents,the arc interference of the two electrodes is the most serious.With the increasing of the currents difference,the change of microstructure will affect the hardness and width of the heat affected zone(HAZ).If the current difference is greater,the hardness of the HAZ decreases and the HAZ width increases.The experimental results show that at pulse-pulse hybrid power combination,two welding wires pulse presented alternative ignition in negative phase.When the current of the lead wire is higher than that of the trail wire in a range of 20 A,the arcs interference is relatively small and the arcs is stable,and the optimal hardness,weld size and microstructure of the welded joins are obtained.
The welding of Q235 steel plates was carried out by anti-phase synchronized synergic-pulsed twin-wire MAG welding(MAG)method and the effect of the lead-trail wires welding currents in different configuration on properties and microstructure of the welded joints was investigated.The results show that the difference of the lead-trail welding currents affects the microstructure,strength and hardness of the welded joints.When there is no difference between the lead-trail welding currents,the arc interference of the two electrodes is the most serious.With the increasing of the currents difference,the change of microstructure will affect the hardness and width of the heat affected zone(HAZ).If the current difference is greater,the hardness of the HAZ decreases and the HAZ width increases.The experimental results show that at pulse-pulse hybrid power combination,two welding wires pulse presented alternative ignition in negative phase.When the current of the lead wire is higher than that of the trail wire in a range of 20 A,the arcs interference is relatively small and the arcs is stable,and the optimal hardness,weld size and microstructure of the welded joins are obtained.
引文
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[2]Michie K,Blackman S,Ogunbiyi T E B.Twin-wire GMAW:process characteristics and applications[J].Welding Journal,1999,78(5):31-34.
[3]张菁.双丝GMAW电弧干扰及焊接工艺研究[D].上海:上海交通大学,2015:30-32.ZHANG Jing.The arc interference research and welding process of twin-wire GMAW[D].Shanghai:Shanghai Jiao Tong University,2015:30-32.
[4]Schnick M,Wilhelm G,Lohse M,et al.Three-dimensional modelling of arc behavior and gas shield quality in tandem gas–metal arc weldingusing anti-phase pulse synchronization[J].J Phys D Appl Phys,2011,44(18):185-205.
[5]Xueping D,Huan L,Lijun Y,et al.Stability of twin-electrode pulsed MAG welding[J].Journal of Tianjin University(Science and Technology),2013,46(5):448-52.
[6]潘鑫,张宇,王银柏,等.690 MPa级双丝埋弧焊接头的组织与性能[J].金属热处理,2014,39(8):35-40.PAN Xin,ZHANG Yu,WANG Yin-bai,et al.Microstructure and mechanical properties of 690 MPa weld joint by tandem submerged arc welding[J].Heat Treatment of Metals,2014,39(8):35-40.
[7]Sharma A,Arora N,Gupta S R.Investigation into arc behavior during twin-wire submerged arc welding[J].Mater Manuf Processes,2010,25(8):873-879.
[8]赵博,范成磊,杨春利,等.双丝窄间隙焊接工艺参数对焊缝成形的影响[J].焊接学报,2008,29(6):81-84.ZHAO Bo,FAN Cheng-lei,YANG Chun-li,et al.Effect of double-wire narrow gap GMA welding parameters on weld appearance[J].Transactions of the China Welding Institution,2008,29(6):81-84.
[9]Pang W,Ahmed N,Dunne D.Hardness and micro structural gradients in heat affected zone of welded low carbon quenched and tempered steels[J].Australasian Welding Journal,2011,56(2),36-48.
[10]Dunne D P,Pang W.Structural and hardness gradients in the heat affected zone of welded low carbon martensitic steels[C]//Materials Science Forum.Trans Tech Publications,2013,738:206-211.
[11]Shen S,Oguocha I N A,Yannacopoulos S.Effect of heat input on weld bead geometry of submerged arc welded ASTM A709 Grade 50 steel joints[J].Journal of Materials Processing Technology,2012,212(1):286-294.
[12]郭海云,李桓,刘辉,等.基于协调控制的双丝脉冲焊系统[J].電焊机,2006,36(8):5-7.GUO Hai-yun,LI Huan,LIU Hui,et al.Double-wire pulsed welding system based on coordination control[J].Electric Welding Machine,2006,36(8):5-7.
[13]陈重毅,麻永林,邢淑清,等.Monel-400熔敷金属高温力学性能及断裂行为分析[J].材料热处理学报,2014,35(6):38-43.CHEN Zhong-yi,MA Yong-lin,XING Shu-qing,el al.Mechanical properties and fracture deposited metal at high behavior of Monel-400 temperature[J].Transactions of Materials and Heat Treatment,2014,35(6):38-43.
[14]Rodrigues D M,Menezes L F,Loureiro A.The influence of the HAZ softening on the mechanical behavior of welded joints containing cracks in the weld metal[J].Engineering Fracture Mechanics,2004,71(13):2053-2064.