摘要
控制钨极氩弧焊接(GTAW)的焊接电弧温度、形态等特性是制定其焊接工艺、提高其焊接质量与效率的措施之一。采用数值模拟研究方法,研究了6061铝合金GTAW焊接过程钨极氩弧温度及其形态,对交流及脉冲钨极氩弧温度及其形态进行了比较与分析,阐述了随焊接电流变化钨极氩弧温度及其形态变化规律。研究结果表明,在交流钨极氩弧焊接电流方向变化时焊接电弧将熄弧,其温度下降;焊接电弧形态基本保持钟罩型,其高温区域发生变化;在交流钨极氩弧达到稳定状态时,正接焊接电弧温度较反接的高,焊接电弧高温区域距工件更近,焊接电弧径向尺寸较反接的大;脉冲电流钨极氩弧焊接过程不会熄弧;从峰值到基值焊接电流过渡过程中,焊接电弧沿径向收缩,相反,焊接电弧沿径向扩张,其形态似“腰鼓”状;脉冲基值电流焊接电弧温度较峰值电流的小。
It is one of the measures to formulate its welding process and improve its welding quality and efficiency by controlling the welding arc temperature and shape of GTAW.The GATW welding arc of 6061 aluminum alloy is researched in this paper.The change of welding arc temperature and shape from the moment of current change of AC and pulse power supply to the process of arc stability is studied.The research shows that the arc extinguishes when the AC current changes.The temperature distribution and size of arc are different under different polarity conditions.The temperature of the arc with positive polarity is always higher than that with negative polarity.The arc of pulsed current will not extinguish with time.At the peak current,the arc temperature is higher,and the arc shape is close to the bell jar type.At the base current,the arc shape is similar to“waist drum”shape and the temperature is low.
作者
高珊
高文国
徐起
王成林
李涛
GAO Shan;GAO Wen-guo;XV Qi;WANG Cheng-lin;LI Tao(Schoolof Materials Science and Engineering,Taiyuan University of Science and Technolegy,Taiyuan 030024,China)
出处
《太原科技大学学报》
2024年第4期387-391,共5页
Journal of Taiyuan University of Science and Technology
基金
国家自然基金(51875384)
山西省自然科学基金项目(201901D111269)
山西省大学生创新创业项目(2021488)。
