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采用单一活性剂及多组元活性剂,对4003超纯铁素体不锈钢进行A-TIG焊接。研究了单一活性剂对焊缝形貌的影响;在此基础上进行多组元活性剂配比,并探究了多组元活性剂焊接时焊接电流和焊接速度对焊缝形貌的影响;对比分析了TIG与A-TIG焊接接头的显微组织、力学性能以及腐蚀性能。结果表明,在一定焊接电流和焊接速度下,采用单一氧化物活性剂焊接的焊缝深宽比优于采用单一氟化物;作用效果最好的单一活性剂和多组元活性剂ATIG焊焊缝的深宽比分别较传统TIG焊提高了2倍和3倍。采用自行研制的多组元活性剂焊接5 mm厚4003铁素体不锈钢,比传统TIG焊接热输入减小了1/2,焊接接头显微组织细化,力学性能和腐蚀性能均有所提高。
A-TIG welding of 4003 ultrapure ferritic stainless steel was performed using a single active agent and multi-component activator. The effect of single active agent on the morphology of the weld was investigated. Based on this, the multi-component active agent ratio was investigated and the effect of welding current and welding speed on the weld morphology was discussed. The microstructure, mechanical properties and corrosion resistance of TIG and A-TIG welded joints were analyzed. The results show that at a certain welding current and welding speed, the weld width ratio of single oxide activator welding is better than that of single fluoride; the best effect of single active agent and multi-component activator ATIG weld Aspect ratio than the traditional TIG welding increased by 2 times and 3 times. The self-developed multi-component activator welding 5 mm thick 4003 ferritic stainless steel is reduced by 1/2 compared with the traditional TIG welding heat input. The microstructure of the welded joint is refined and the mechanical properties and corrosion resistance are improved.