焊前预热对T2紫铜激光焊接接头组织和性能的影响
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摘要
对2mm厚T2紫铜板进行了未预热和不同温度预热(100,150,200℃)的光纤激光焊接,研究了焊前预热对该焊接接头组织和性能的影响。结果表明:与未预热的相比,150℃预热激光焊接接头的熔深和熔宽较大,焊缝的等轴晶和熔合区的胞状晶粒均较粗大;预热激光焊接接头焊缝的电阻率与未预热的相比有所降低,焊前预热改善了焊接接头的导电性能;150℃预热激光焊接接头的显微硬度总体上高于100,200℃预热的,显微硬度均随距焊缝中心距离的增大先减后增,焊缝中心的最大;随着预热温度的升高,焊缝的自腐蚀电流密度先增大后减小,耐腐蚀性能虽先减小后增大,但相差较小。
The 2mm thick T2 copper was first non-preheated and preheated at different temperatures(100,150,200 ℃)then welded by fiber laser.The influences of preheating before welding on the microstructures and properties of the welded joint were investigated.The results show that the fusion depth and width of the welded joint with preheating at 150 ℃ were larger than those of without preheating and the equiaxed crystals in weld and cellular grains in fusion zone were coarser.The weld resistivity of the welded joint with preheating decreased comparing to those without preheating,indicating that the preheating improved the conductivity of the welded joint.The microhardness of the welded joint with preheating at 150 ℃ was higher than that of at 100,200 ℃.The micro-hardness first decreased then increased with the increasing distance from the weld center and that of weld center was the largest.With the preheating temperature increasing,the free corrosion current density of the weld first increased then decreased.The corrosion resistance first decreased then increased while the difference was very small.
The 2mm thick T2 copper was first non-preheated and preheated at different temperatures(100,150,200 ℃)then welded by fiber laser.The influences of preheating before welding on the microstructures and properties of the welded joint were investigated.The results show that the fusion depth and width of the welded joint with preheating at 150 ℃ were larger than those of without preheating and the equiaxed crystals in weld and cellular grains in fusion zone were coarser.The weld resistivity of the welded joint with preheating decreased comparing to those without preheating,indicating that the preheating improved the conductivity of the welded joint.The microhardness of the welded joint with preheating at 150 ℃ was higher than that of at 100,200 ℃.The micro-hardness first decreased then increased with the increasing distance from the weld center and that of weld center was the largest.With the preheating temperature increasing,the free corrosion current density of the weld first increased then decreased.The corrosion resistance first decreased then increased while the difference was very small.
引文
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[3]洪丽玲,辛选荣,张柯柯,等.铜/铝合金冷压-扩散复合焊接接头的显微组织[J].机械工程材料,2008,32(8):23-25.
[4]郑远谋.铜-钛复合板的爆炸焊接[J].机械工程材料,1991,15(3):47-50.
[5]ERBA M D.CO2laser welding of copper slabs[J].Optics&Laser Technology,1985,17(5):260-261.
[6]DAURELIO G,GIORLEO G.Experimental techniques to cut and weld copper by laser-a review[J].Material&Manufacturing Progress,1991,6(4):577-603.
[7]HASHIMOTO K,SATO T,NIWA K.Laser welding copper and copper alloys[J].Journal of Laser Applications,1991,3(1):21-25.
[8]GOUVERIA H N.The coupling mechanisms in the CO2laser welding of copper[D].Cranfield:Cranfield University,1994.
[9]张福强,靳红星,王迪麟,等.钨极氩弧焊在纯铜焊接中的应用[J].焊接技术,2010,39(S1):13-16.
[10]白津生,林嘉明.铜的TIG钎焊工艺探讨[J].焊接技术,1994,23(2):24-25.
[11]杨志恒,李小兵.薄壁紫铜管的气焊[J].甘肃科技纵横,2004,33(5):67-76.
[12]SPILLER K R.Welding copper by the gas shielded arc processes[J].Metal Constr Brit Weld J,1970,2(2):45-53.
[13]ANIK S,DORN L.Metallophysical processes in the welding of copper and copper alloy welding methods[J].Welding and Cutting,1988(9):139-143.
[14]胡永旺,刘学明.接插母线铜排的TIG焊工艺[J].焊接技术,1996,25(5):13-14.