The magnetic arc constriction technique was used to control the heat input-related metallurgical problems such as segregation of Nb and laves phase formation in the weld metal region of gas tungsten arc welding (GTAW) of Inconel 718 alloy. The delta current (arc constriction current) and delta current frequency are the two important parameters in controlling the arc characteristics. The main effect of the delta current and delta current frequency on the microstructural modification and corresponding influence on the tensile properties of a gas tungsten constricted arc (GTCA) welded 2-mm-thick Inconel 718 alloy sheet was investigated systematically and presented in this article. Superior tensile properties were exhibited by the joints made using a delta current of 50 A and delta current frequency of 4 kHz because of the grain refinement in the fusion zone and finer, distinct laves phase formation.

电磁电弧收缩技术用于控制与热输入有关的冶金问题，例如Inconel 718合金的钨极气体保护电弧焊（GTAW）的焊接金属区域中的Nb偏析和Laves相形成。增量电流（电弧收缩电流）和增量电流频率是控制电弧特性的两个重要参数。本文系统地研究了δ电流和delta电流频率对焊接2-mm厚Inconel 718合金的钨极气体保护电弧（GTCA）焊接组织的显微组织改性的主要影响以及相应的影响。