GTAW에서 용가재 형상이 용적 이행 안정성에 미치는 영향

Abstract

Unlike other welding methods that use consumable electrodes such as GMAW and FCAW, GTAW is a welding method that uses non-consumable tungsten electrodes and supplies a separate filler metal. The arc and filler metal are separately controlled while welding. Depending on the shape of the filler metal used in GTAW, the area where the arc plasma enters the filler metal and the density of the current vary. In the case of a circular filler metal, the location of transmission to the arcs varies easily depending on the cast and helix, making if difficult to achieve stable transfer. In this case, sticking due to unmelting of the filler metal is likely to occur at a high current and fast filler metal feeding speed, and a high current density plasma stream directly enters the base metal, causing a humping bead. have. In addition, when the filler height is high, intermittent bridging in which the bridge of continuous bridging is broken or falling may occur, and sticking may occur when the filler height is low. Therefore, it is necessary to develop an algorithm that can maintain the proper arc length and filler height of filler metal by analyzing the welding phenomenon that occurs when the arc length and filler height change. In this study, welding phenomena when the arc length and filler height are changed using GTAW circular filler metal and a wide C-type filler metal were compared by waveform signal, and the effect of filler metal shape on the stability of metal transfer was modeled, and a metal transfer mode classification algorithm that can be applied to welding was developed.