High-Speed Tandem Pulsed GTAW of Thin Stainless Steel Plate

Abstract

A novel high-speed welding process with tandem pulsed gas tungsten arcs, which employed two pulse arcs with a 180-deg phase to regulate the behavior of the weld pool and obtain a high-quality weld bead with low welding heat input, was proposed. The effects of pulse welding current parameters on the weld appearance were studied through a statistical design of experiment. The welding speed of a 1.2-mm-thick 304 austenite stainless steel plate can reach up to 3.0 m/min without sacrificing weld appearance quality. The grain structure, mechanical properties, and heat input of tandem pulsed gas tungsten arc welding (GTAW-P) were analyzed and compared with those of single and tandem GTAW. Good mechanical properties of the welded joint were obtained by tandem GTAW-P. Compared with the single and tandem GTAW, the heat input of tandem GTAW-P was decreased by 17.5 and 14.5%, respectively. The main arc at pulse peak obtained sufficient penetration, and the assisting arc at pulse background reduced the unnecessary heat input. When the main arc reached pulse background, the assisting arc at pulse peak heated the trailing region of the molten pool continuously to ensure reflow of the metal and suppressed the generation of weld defects.

Spectroscopy Peculiarities of Electric Arc Discharge Plasma With Iron Vapours

“…A high-speed welding process with tandem pulsed gas tungsten arcs, which employed two pulse arcs is another one novel kind of GTAW [4]. The welding speed was studied by application of such method to 304 austenite stainless steel plate.…”