铝合金双面双弧同步立焊工艺特征与接头组织性能分析
发布时间：2019-08-11 16:17
【摘要】：采用双面双弧同步立焊工艺方法,对8 mm厚5083铝合金进行自熔试验,I形坡口一次熔透,焊缝成形美观。通过调节两侧电弧热量配比研究熔池成形规律,并从焊接接头的微观组织、力学性能分析其连接机理。研究结果表明,随着热输入的增加,双面双弧同步立焊热量加速集聚,熔深以三次幂函数的速度增大。双面双弧同步立焊接头轮廓呈"双曲线形",而相同热输入下的单面焊接头则呈"倒马鞍形"。总热输入一定的情况下,双面双弧接头正面熔宽随能量配比系数的增大而增大,反面熔宽随能量配比系数的增大而减小,中间熔宽基本不变,熔化面积随能量配比系数的增大先增大后减小;能量配比系数一定时,随着焊速的增大,接头熔宽和熔化面积均减小。母材组织为条带状纤维织构,热影响区发生静态回复与再结晶,变形组织消失,产生新晶粒,焊缝区主要由α-Al固溶体、β相(Al_8Mg_5)质点和骨骼状的Mg_2Si析出相组成。焊缝的抗拉强度随着能量配比系数的增大而减小,拉伸断裂形式为韧性断裂。热影响区出现软化现象,双弧交汇区硬度低于正面焊缝区。
[Abstract]:The self-fluxing test of 8 mm thick 5083 aluminum alloy was carried out by double-sided double-arc synchronous vertical welding. The I-groove was penetrated once and the weld shape was beautiful. The forming law of molten pool is studied by adjusting the ratio of arc heat on both sides, and the bonding mechanism is analyzed from the microstructure and mechanical properties of welded joint. The results show that with the increase of heat input, the heat of double-sided double-arc synchronous vertical welding accelerates and the penetration increases with the speed of cubic power function. The profile of double-sided double-arc synchronous vertical welding head is "hyperbolic", while the single-sided welded joint with the same heat input is "inverted saddle". When the total heat input is certain, the front melting width of double-sided double-arc joint increases with the increase of energy ratio coefficient, while the reverse melting width decreases with the increase of energy ratio coefficient, the intermediate melting width is basically unchanged, and the melting area increases at first and then decreases with the increase of energy ratio coefficient. When the energy ratio coefficient is constant, the melting width and melting area of the joint decrease with the increase of welding speed. The microstructure of the base metal is banded fiber texture, the static recovery and crystallization occur in the heat affected zone, the deformed structure disappears and new grains are produced. The weld zone is mainly composed of 伪-Al solid solution, 尾 phase (Al_8Mg_5) particles and skeletal Mg_2Si precipitated phase. The tensile strength of weld decreases with the increase of energy ratio coefficient, and the tensile fracture form is ductile fracture. The hardness of double arc intersection zone is lower than that of front weld zone.
【作者单位】： 南京理工大学材料科学及工程学院;青岛四方车辆研究所有限公司;
【分类号】：TG457.14
本文编号：2525390
[Abstract]:The self-fluxing test of 8 mm thick 5083 aluminum alloy was carried out by double-sided double-arc synchronous vertical welding. The I-groove was penetrated once and the weld shape was beautiful. The forming law of molten pool is studied by adjusting the ratio of arc heat on both sides, and the bonding mechanism is analyzed from the microstructure and mechanical properties of welded joint. The results show that with the increase of heat input, the heat of double-sided double-arc synchronous vertical welding accelerates and the penetration increases with the speed of cubic power function. The profile of double-sided double-arc synchronous vertical welding head is "hyperbolic", while the single-sided welded joint with the same heat input is "inverted saddle". When the total heat input is certain, the front melting width of double-sided double-arc joint increases with the increase of energy ratio coefficient, while the reverse melting width decreases with the increase of energy ratio coefficient, the intermediate melting width is basically unchanged, and the melting area increases at first and then decreases with the increase of energy ratio coefficient. When the energy ratio coefficient is constant, the melting width and melting area of the joint decrease with the increase of welding speed. The microstructure of the base metal is banded fiber texture, the static recovery and crystallization occur in the heat affected zone, the deformed structure disappears and new grains are produced. The weld zone is mainly composed of 伪-Al solid solution, 尾 phase (Al_8Mg_5) particles and skeletal Mg_2Si precipitated phase. The tensile strength of weld decreases with the increase of energy ratio coefficient, and the tensile fracture form is ductile fracture. The hardness of double arc intersection zone is lower than that of front weld zone.
【作者单位】： 南京理工大学材料科学及工程学院;青岛四方车辆研究所有限公司;
【分类号】：TG457.14
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