A novel ultrafast-convert hybrid pulse square-wave variable polarity arc welding power source was developed. The variable polarity current which crossed zero with no dead time possessed the ultrafast converting speed ...A novel ultrafast-convert hybrid pulse square-wave variable polarity arc welding power source was developed. The variable polarity current which crossed zero with no dead time possessed the ultrafast converting speed and the series of ultrasonic pulse current were superimposed in the positive polarity current duration. A high-efficiency hybrid pulse variable polarity gas tungsten arc welding （HPVP-GTAW）process for aluminum alloys was achieved. With X-ray inspection, microstructure analysis, tensile tests and scanning electron microscopy （SEM） for fracture surface, the square butt welding cbaracteristics of 5A06, 2A14 and 2219 aluminum alloys were tested, respectively. Experimental results show that microstructure and mechanical properties of these aluminum alloy welded joints are influenced significantly by the introduction of ultrasonic pulse current. The weld quality is improved predominantly by the novel HPVP-GTA W process.展开更多
基金The research is supported by the China Postdoctoral Science Foundation （No. 20090460186）.
文摘A novel ultrafast-convert hybrid pulse square-wave variable polarity arc welding power source was developed. The variable polarity current which crossed zero with no dead time possessed the ultrafast converting speed and the series of ultrasonic pulse current were superimposed in the positive polarity current duration. A high-efficiency hybrid pulse variable polarity gas tungsten arc welding （HPVP-GTAW）process for aluminum alloys was achieved. With X-ray inspection, microstructure analysis, tensile tests and scanning electron microscopy （SEM） for fracture surface, the square butt welding cbaracteristics of 5A06, 2A14 and 2219 aluminum alloys were tested, respectively. Experimental results show that microstructure and mechanical properties of these aluminum alloy welded joints are influenced significantly by the introduction of ultrasonic pulse current. The weld quality is improved predominantly by the novel HPVP-GTA W process.
