7075铝合金等离子-MIG复合焊接接头热裂纹数值模拟
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摘要
针对7075铝合金等离子-MIG复合焊接过程中热裂纹产生的宏、细观原因问题,采用鱼骨法进行焊接热裂纹敏感试验。使用直径φ1.2 mm的ER5356铝合金焊丝对厚度4 mm的7075-T6铝合金板材进行等离子-MIG复合焊接试验,测定7075-T6铝合金脆性温度区间(BTR),评定其热裂纹倾向。采用宏观热弹塑性结合细观晶体塑性有限元法数值模拟,结果表明略微的应变差会导致热裂纹敏感性的不同,故此提出适当的调节应变差,优化焊接工艺过程。
Aiming at the macroscopic and mesoscopic causes of hot cracking in the 7075 aluminum alloy plasma-MIG hybrid welding process. Fishbone cracking test was applied to test the welding hot cracking sensitivity. 7075-T6 aluminum alloy sheet with 4 mm thickness was welded by Plasma-MIG hybrid welding method using ER5356 aluminum alloy wire with φ1.2 mm diameter. The brittle temperature range(BTR) of the 7075-T6 aluminum alloy was measured and the hot cracking tendency was evaluated. Combing macroscopic thermoelastic-plastic method and mesoscopic crystal plastic finite element method, the numerical simulations results show that a slight strain difference will lead to the different hot cracking sensitivity, so the appropriate adjustment of the strain difference is proposed to optimize the welding process.
Aiming at the macroscopic and mesoscopic causes of hot cracking in the 7075 aluminum alloy plasma-MIG hybrid welding process. Fishbone cracking test was applied to test the welding hot cracking sensitivity. 7075-T6 aluminum alloy sheet with 4 mm thickness was welded by Plasma-MIG hybrid welding method using ER5356 aluminum alloy wire with φ1.2 mm diameter. The brittle temperature range(BTR) of the 7075-T6 aluminum alloy was measured and the hot cracking tendency was evaluated. Combing macroscopic thermoelastic-plastic method and mesoscopic crystal plastic finite element method, the numerical simulations results show that a slight strain difference will lead to the different hot cracking sensitivity, so the appropriate adjustment of the strain difference is proposed to optimize the welding process.
引文
[1]PENG Xiaoyan,CAO Xiaowu,DUAN Yulu,et al.Microstructures and properties of MIG welded joint of 7020 aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2014,24(4):912-918.
[2]GAI Hongde,TANG Jie,DAI Jiahui,et al.Effect of welding current on microstructure and properties of welded joint in AC-TIGwelding of 7A52 aluminum alloy[J].Materials Review,2013,27(21):329-331.
[3]ENZ J,RIEKEHR S,VENTZKE V.Laser welding of highstrength aluminum alloys for the sheet metal forming process[J].Procedia CIRP,2014(18):203-208.
[4]Lu Z,Evans W J,Parker J D,et al.Simulation of microstructure and liquation cracking in 7017 aluminum alloy[J].Materials Science and Engineering A Switzerland,1996,220(1-2):1-7.
[5]陈大军,李忠盛,戴明辉,等.7075超高强铝合金脉冲MIG焊接头组织与性能[J].精密成形工程,2017(11):170-174.
[6]Asai M S,Ogawa M T,Ishizaki M Y,et al.Application of Plasma MIG Hybrid Welding to Dissimilar Joints Between Copper and Steel[J].Welding in the World Le Soudage Dans Le Monde,2013,56(1-2):37-42.
[7]Ono K,Liu Z,Era T,et al.Development of a Plasma MIGWelding System for Aluminum[J].Welding International,2009,23(23):805-809.
[8]Houldcroft P T.A Simple Cracking Test for Use with Argon Arc Welding[J].Welding Journal,1955(10):471-475.
[9]Rehfeldt D,Bollman A.Using Statistical Signal Analysis for Analyzing and Monitoring GMAW-Processes[C].Beijing:Proceeding of Symposium on‘Strategy of Welding Research in 2000 and Possible Aspects of China-Germany Cooperation’,1991.
[10]LiuW,TianX,ZhangX.Preventing weld hot cracking by synchronous rolling during welding[J].Welding Journal,1996,75(9):297-304.
[11]Prokhorov N N.Problems of the strength of Metals in the process of solidification during welding[J].Weld.Produc.,1956(6):5.
[2]GAI Hongde,TANG Jie,DAI Jiahui,et al.Effect of welding current on microstructure and properties of welded joint in AC-TIGwelding of 7A52 aluminum alloy[J].Materials Review,2013,27(21):329-331.
[3]ENZ J,RIEKEHR S,VENTZKE V.Laser welding of highstrength aluminum alloys for the sheet metal forming process[J].Procedia CIRP,2014(18):203-208.
[4]Lu Z,Evans W J,Parker J D,et al.Simulation of microstructure and liquation cracking in 7017 aluminum alloy[J].Materials Science and Engineering A Switzerland,1996,220(1-2):1-7.
[5]陈大军,李忠盛,戴明辉,等.7075超高强铝合金脉冲MIG焊接头组织与性能[J].精密成形工程,2017(11):170-174.
[6]Asai M S,Ogawa M T,Ishizaki M Y,et al.Application of Plasma MIG Hybrid Welding to Dissimilar Joints Between Copper and Steel[J].Welding in the World Le Soudage Dans Le Monde,2013,56(1-2):37-42.
[7]Ono K,Liu Z,Era T,et al.Development of a Plasma MIGWelding System for Aluminum[J].Welding International,2009,23(23):805-809.
[8]Houldcroft P T.A Simple Cracking Test for Use with Argon Arc Welding[J].Welding Journal,1955(10):471-475.
[9]Rehfeldt D,Bollman A.Using Statistical Signal Analysis for Analyzing and Monitoring GMAW-Processes[C].Beijing:Proceeding of Symposium on‘Strategy of Welding Research in 2000 and Possible Aspects of China-Germany Cooperation’,1991.
[10]LiuW,TianX,ZhangX.Preventing weld hot cracking by synchronous rolling during welding[J].Welding Journal,1996,75(9):297-304.
[11]Prokhorov N N.Problems of the strength of Metals in the process of solidification during welding[J].Weld.Produc.,1956(6):5.