ER5356铝合金焊丝TIG增材制造弧光强度及电弧形态分析

Study on Optical Density and Arc Shape of ER5356 Aluminium Alloy Wire TIG Additive Manufacturing

采用ER5356铝合金焊丝进行交流钨极氩弧焊(TIG)堆焊,高速摄像采集系统记录堆焊过程电弧形态,研究热输入及电流方式对成形件堆焊过程弧光强度、电弧形态及成形件宏观形貌的影响。结果表明,焊接线能量对电弧形态、弧光强度、成形件层宽、表面光洁度,以及起弧端凸起和熄弧端塌陷等均有显著影响。电流方式能有效调控起弧、稳态和熄弧阶段电弧形态、弧光强度及成形件形貌,并进一步对电弧形态及成形件形貌变化机制进行深入探讨。以上分析结果表明,采用低频交流脉冲调制堆焊工艺可获得较佳堆焊结构件,为实际工程应用提供理论依据及技术支撑。

ER5356 aluminum alloy wire was used for alternating current argon tungsten arc welding(AC-TIG)test.Arc shape during surfacing process were recorded with a high-speed camera acquisition system.The effect of heat input and current mode on the optical density,arc shape and the macroscopic morphology of the forming parts were studied.The results show that the welding line energy has significant influence on arc shape,optical density,the layer width of forming part,the surface finish,and the bulge at the beginning of the arc and the collapse at the end of the arc.The current mode can effectively control the arc morphology,optical density and the macroscopic morphology of structural parts at the starting,steady and extinguishing stages.In addition,the evolution mechanism of arc morphology and forming part morphology was discussed further.Based on the above analysis,the optimum welding structure part can be obtained by adopting low-frequency AC pulse welding process parameters,which will also provide theoretical basis and technical support for practical engineering application.