Abstract
For diminishing welding defects such as incomplete penetration, which may easily occur during the twin wire Double Pulsed Metal Inert Gas (DP-MIG) high-speed welding, a novel method using additional shielding gas is introduced in this paper. A branch for the additional shielding gas was specially set near the back end of the protection hood for the DP-MIG nozzle. The constructed gas branch was used for enabling manual intervention in the formation of a high-temperature solid–liquid weld seam just emerging from the nozzle and also for secondary gas protection on the surface of the weld seam. The butt welding test was carried out in the 2205 duplex stainless steel plate and the weld seam was then characterized by a tensile test, metallographic analysis, X-ray non-destructive testing (NDT), hardness analysis, and impact test. The results showed that the introduction of an appropriate amount of additional shielding gas can effectively improve and diminish the unfused weld seam and also improve the mechanical properties such as the tensile properties of the weld joint, the hardness and toughness of the weld joints. Therefore, the introduction of additional shielding gas has further research potential in theory and process practice.
Highlights
With the developments in marine engineering, aeronautics and aerospace, transportation and other industries, welding technology has undergone continuous development
Twin wire Double Pulsed Metal Inert Gas (GMAW) welding technology can perform high-speed welding and achieve a high deposition rate and is considered a promising topic for research internationally [2,3,4] with many researchers being actively involved in related studies
With the basic requirements of avoiding undercut and hump bead, the best set of parameters for high-speed welding was obtained with a welding speed up to 4.5 m/min [5]; Ueyama et al investigated the effects of the distance between the leading and trailing wire and the mixing ratio of gas on the abnormal arc voltage and arc interruption in twin-wire GMAW welding
Summary
With the developments in marine engineering, aeronautics and aerospace, transportation and other industries, welding technology has undergone continuous development. Twin wire Double Pulsed Metal Inert Gas (GMAW) welding technology can perform high-speed welding and achieve a high deposition rate and is considered a promising topic for research internationally [2,3,4] with many researchers being actively involved in related studies. Ueyama et al studied the effects of the inclination angle between the leading and trailing wire, the twin wire spacing and the welding current ratio on the formation of weld bead in the high-speed welding process. With the basic requirements of avoiding undercut and hump bead, the best set of parameters for high-speed welding was obtained with a welding speed up to 4.5 m/min [5]; Ueyama et al investigated the effects of the distance between the leading and trailing wire and the mixing ratio of gas on the abnormal arc voltage and arc interruption in twin-wire GMAW welding.
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