科研之友
微信
新浪微博
Facebook
分享链接
摘要
Arc force was the main factor for arc behavior during the arc welding process, which had an effect on the molten pool. Ultrahigh-frequency pulsed gas tungsten arc welding (UHFP-GTAW) created the larger arc force and weld penetration with experimental research. The arc force caused surface depression that pushed the heat source downward to the bottom of the molten pool. As a result, the fluid status and geometry of the molten pool were changed. The surface depression was calculated with the resultant liquid-gas interface. Zero solutions of the balance functions were obtained with approaching curves. The results indicated an available condition with arc curve assumption and an acute angle of the spherical cap were known to be accurate. Ellipsoid assumption was discussed with a larger arc force (80 kHz) that guaranteed the angle of the spherical cap theta > 90 deg. The transient simulation was carried out, and the results indicated the surface depression improved the penetration although low heat conductivity of titanium was seen. Furthermore, double circulation can be found in the molten pool that was caused by both electromagnetic force and surface tension. The velocity demonstrated the dominance of surface tension with a maximum up to 1.74 m/s. And it also proved the effect of counterclockwise circulation on penetration by electromagnetic force.
- 出版日期2014-8
- 单位北京航空航天大学
