Abstract: In order to achieve efficient and reliable gas metal arc welding(GMAW) of high-nitrogen steels, the effects of double-wire angle on the droplet transfer behavior, electrical signal characteristics and formation characteristics of high-nitrogen steels is investigated. The results showed that as the double-wire alignment angle decreased, the spreading of the melt pool became worse, the height of the overlapping part of the melt pool increased, and the instability of the droplet transfer increased. When the alignment angle is≥45°, the melt pool spreads smoothly and the effects of droplet transition interactions of the double wires are reduced. The peaks of the welding current and voltage of the dual-wire welding with the increase of the arrangement angle from overlapping to alternation, double-wire melting droplet transfer is desirable. Compared with single wire welding, double-wire welding has less spatter and better formation under the same total wire feeding amount. Moreover, due to the double-wire mutual melting pool, the weld formation is more satisfactory as the double-wire arrangement angle increased.

Key words: high nitrogen steel, GMAW, double wire, arrangement angle, droplet transition, forming characteristics