4003铁素体不锈钢A-TIG焊接性能研究

Study on A-TIG Weldability of 4003 Ferritic Stainless Steel

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。

Single and multi component active agent was used in A-TIG welding of 4003 ferritic stainless steel. The effects of single component on the morphology of weld beam were studied. On this basis, a multicomponent agent was developed. The effect of welding current and speed on the morphology of the weld beam was studied. The microstructure, mechanical properties and corrosion behavior of the A-TIG weld beam was analyzed compared with those of TIG weld beam. The results show that： with certain welding current and speed, the depth-to-width ratio of single component oxide agent weld beam is superior than that of fluoride agent weld beam. The depth-to-width ratio of single and multi component agent weld beam can be improved by 2 and 3 times at maximum respectively. The newly developed multicomponent agent reduces 50% that of 5 mm 4003 stainless steel weld heat input compared with traditional TIG method, and then, the microstructure, mechanical properties and corrosion behavior of the weld beam enhance.