【作者】 王红鸿；

【导师】 张汉谦；

【作者基本信息】 太原理工大学 ， 材料加工工程， 2005， 硕士

【摘要】 综述了国内外钛型气保护药芯焊丝熔滴过渡及其工艺性的研究状况及进展,提出了本课题的研究方向及内容。 采用水中收集熔滴、高速摄影、汉诺威焊接质量分析、平板堆焊、理化分析等测试方法,对国内外三种典型钛型CO₂气保护药芯焊丝YC-YJ502（Q）（文中标记为A）、Supercored71H（文中标记为B）、DW-100（文中标记为C）的熔滴过渡形态、工艺性、影响因素、焊接冶金特性等方面展开试验研究,结果表明:焊接电流是影响熔滴过渡的关键因素,随着焊接电流的增大,熔滴细化,熔滴平均质量减小,熔滴过渡频率提高。焊接电流也是影响工艺性的关键因素,存在着工艺性最佳的焊接电流范围。在240A、28V的焊接参数范围内,药芯焊丝的熔滴过渡形态基本属于非轴向细颗粒滴状过渡形态,发现了大角度排斥过渡、小角度排斥过渡现象及对工艺性的重要影响。A焊丝以大角度排斥过渡为主,工艺性较差;B焊丝以平稳的小角度排斥过渡为主,工艺更多还原

【Abstract】 The worldwide research development of metal transfer and operation performance of rutile flux-cored arc welding (FCAW) is reviewed. The study director and main content of this paper are proposed.The metal transfer, operation performance, effect factor, metallurgy characteristic of three rutile flux-cored wires are investigated by collecting droplet in water, high speed cinema photographic technique, Analysator Hannover, hardfacing on the plate and physical-chemical analysis. The wires used in experiment are YC-YJ502(Q) (marked A), Supercored 71H (marked B), DW-100 (marked C). The result shows: the welding current is thekey solution to the metal transfer. The droplet becomes smaller, and the transfer frequency goes up as the increasing current. The current is also critical to the operation performance, and there is a current limit in which the usability is the best. In the welding condition of 240A, 28V, the metal transfer mode is non-axis drop spray transfer. The large angle and small angle repelled transfer mode, and the important effect on usability are discovered. A wire is in large angle repelled transfer mode, the operation performance is poor, B wire metal transfer in small angle repelled transfer, the operation performance is the best, the above two mode appear alternately in the C wire, so the operation performance is intermediate. The droplet of B wire is the smallest while the transfer frequency is the highest among the three wires, A wire is inferior to B wire, the case of C wire is converse to B wire. The difference of composition of Mn, Si in the droplet reaction shows that because Si added to the droplet of B wire is more than A wire and C wire, the droplet of B wire is smaller than A wire and C wire, and the droplet of C wire is the biggest among them.The phenomena of droplet transferring deviated form the wire axis in different angle and the effect on the operation performance are discovered first time in this paper. The "large angle repelledtransfer, transfer interval time" are put forth to revalue the metal transfer and the usability which enrich the metal transfer theory to some degree.This paper exposed the relationship between the metal transfer and the usability of the three typical rutile flux-cored wires. This work give the guidance to select correct operating conditions of welding, so it has the practice value.This paper also shows up the relationship between the welding metallurgy and metal transfer and the usability by analysis of the composition of sheath, droplet and deposited metal.更多还原