Research on the Characteristics of Double-Sided Hybrid Laser-GMAW Synchronous Horizontal Welding of High-strength Thick Steel Plates

doi:10.3901/JME.2016.02.047

Abstract

Abstract: A double-sided hybrid laser-gas metal arc welding(GMAW) synchronous welding technology is systematic studied against the application of 30 mm thick, shipbuilding high-strength steel 10Ni5CrMoV butt joint in horizontal welding. The results show that against the effect of the gravity in horizontal position and the unsymmetrical groove on the behavior of droplet and arc, the problems such as deviation of arc, landing location of droplet and lack of sidewall fusion in the hybrid laser-GMAW horizontal welding process are solved by using the influence of laser on the arc shape. The deviation of the arc can be effectively suppressed by decreasing the distance between the laser and the wire because the arc could be effectively attracted and compressed when the distance is shorter. Therefore, the electromagnetic force and the plasma drag force promote the droplet transferred to the weld pool. The double-sided hybrid laser-GMAW synchronous horizontal welding includes root pass and filling pass welding, and the root pass welding is the key to guarantee the welding quality. The results also indicate that a 30 mm thick, shipbuilding high-strength steel 10Ni5CrMoV is welded by the novel, high-strength and high-efficient double-sided hybrid laser-GMAW synchronous welding with 4 passes. Excellent weld surface and welded joints without crack, incomplete penetration and lack of sidewall fusion defect are achieved. The ultimate tensile strength of the welded joint is higher than that of the base metal. Additionally, the impact toughness absorbed energy value of the welded joint is 57.3 J at –50 ℃.

Key words: double-sided synchronous welding, horizontal welding, hybrid laser-arc welding, landing of droplet, welding morphology

CLC Number:

TG456

CHEN Yanbin, FENG Jiecai, LI Liqun. Research on the Characteristics of Double-Sided Hybrid Laser-GMAW Synchronous Horizontal Welding of High-strength Thick Steel Plates[J]. Journal of Mechanical Engineering, 2016, 52(2): 47-55.

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