等离子+缆式焊丝脉冲GMAW复合焊熔池流体行为研究

目的 研究等离子+缆式焊丝脉冲GMAW复合焊过程的熔池流体行为.方法 综合考虑传热学以及流体动力学,建立Fluent数值分析模型.使用双椭球–锥体热源模型代表等离子弧焊传热模型,用双椭球热源表征GMAW电弧传热并考虑熔滴传热,同时考虑熔池受到的电磁力、浮力、表面张力、等离子流力等作用力.基于Fluent软件,对复合焊过...

Weldpool Fluid Behavior of Plasma Arc Welding+Cable-wire Pulsed GMAW Hybrid Welding

The molten pool fluid behavior of the plasma+cable wire pulsed GMAW hybrid welding process was studied. Heat transfer and fluid dynamics are considered comprehensively, and a fluent numerical analysis model was established. The double ellipsoid cone heat source model was used to represent the heat transfer model of plasma arc welding. The double ellipsoid heat source was used to characterize the heat transfer of GMAW arc and the heat transfer of droplet is considered. The electromagnetic force, buoyancy, surface tension, plasma flow force and other forces on the weld pool are considered. Based on FLUENT software, the temperature field and flow field of the weld pool in the process of hybrid welding were studied, and the fluid behavior of the weld pool was simulated when the pulse current is 150 A, and verified and compared by experimental. The results show that fixed plasma welding current is 100 A, welding speed is 30 cm/min, and adjusted GMAW pulse average current is 150 A. It is found that the simulation results show that the melting width is 10.57 mm; The penetration is 2.58 mm; The reinforcement is 3.66 mm; The simulation results based on the numerical model are in good agreement with the experimental results. It shows that the GMAW composite welding numerical model established in this paper can effectively guide the welding process.