Research on weld formation mechanism of laser-MIG arc hybrid welding with butt gap

Abstract

At present, there are few researches on laser -MIG arc hybrid welding with a large butt gap. In this paper, laser-MIG arc hybrid welding is used to weld low-alloy high-strength steel with a thickness of 3mm, and a laser-MIG arc hybrid welding process under large gap conditions is developed. This paper studies the effects of arc voltage, laser-wire distance, and wire feed speed on the gap bridging capability of hybrid welding under different butting gaps were studied. Under the condition of the 1mm butt gap, the influence mechanism of laser-wire distance on weld the weld formation of hybrid welding is analyzed by combining high-speed photography, welding current and voltage waveform, the macroscopic and microscopic morphology of the weld. The results show that there are optimal process parameter values for the effects of arc voltage and laser-wire distance on the gap bridging capability of hybrid welding. Adjusting the laser-wire distance can optimize the energy distribution of laser on the welding wire and weld pool, thus controlling the arc current, voltage, and droplet transition mode, and finally affecting the weld penetration and forming. When the laserwire distance is 0mm, the droplet transition frequency is the fastest, and the droplet transition is a mixture of short circuit transition and liquid bridge transition. At this point, the welding rate is the fastest and the welding process is the most stable. However, by comprehensively integrating factors such as the gap bridging capability and the weld penetration, the optimal processing parameters are obtained when the laser-wire distance is 0.5mm.

[Retracted] Microstructure and Fatigue Properties of 6061 Aluminum Alloy Laser‐MIG Hybrid Welding Joint

“…However, due to the welding heart cycle, the grain orientation, the second phase particle behavior, and the surrounding internal stress of the traditional fusion welding processes, namely, tungsten inert gas welding (TIG) and metal inert gas welding (MIG), will change significantly. In addition, problems such as coarse structure, defects (welding hot cracks and pores), and burning loss of strengthening alloy elements (Mg and Zn) will occur in the welded zone [4][5][6].…”

“…In response to these problems, Steen W. M. developed laser arc hybrid welding (LAHW) [11]. LAHW is a new type of high efficient welding technology, which perfectly combines both laser and arc thermal sources [6]. Compared with the traditional fusion welding process, LAHW has the advantages of deeper penetration, more stable welding arc, and faster welding speed [12,13].…”

Effect of transverse magnetic field on microstructure and mechanical properties of Ti-6Al-4 V manufactured by Laser-MIG hybrid welding

“…Ti-6Al-4V (TC4) alloy is widely applied in aerospace and astronautics due to its excellent mechanical property, high speci c strength, and long service life [1,2]. Laser-MIG hybrid welding of titanium alloys has gradually attracted the attention of researchers to improve the microstructure and the strength of welded joint in recent years [3,4] due to its excellent combination of welding advantages of both laser welding and arc welding, such as good joint bridging performance, deep weld ability and strong weld joint strength [5].…”

Effect of Butt Gap on Stress Distribution and Carrying Capacity of X80 Pipeline Girth Weld

“…Some researchers have studied the butt gap in joint performance. Huang et al implemented laser-MIG welding of a low-alloy high-strength steel sheet with a 1 mm butt gap and optimized laser-wire distance [ 6 ]. Hao et al established a three-dimensional transient numerical analysis model of tungsten inert gas (TIG) welding with a reserved gap, and analyzed the dynamic variations in the flow field and deformation in the weld pool.…”