Effects of groove constraint space on plasma characteristics during Laser-MIG hybrid welding of Titanium alloy. (December 2019)

• Record Type: Journal Article
• Authors: Huang, Anguo; Zhang, Jiajia; Gao, Chuang; Hu, Renzhi; Pang, Shengyong
• Is Part Of: Journal of manufacturing processes. Volume 48(2019)
• Page Start: 137
• Page End: 144
• Publication Date: 2019-12
• Subjects: Titanium alloy thick plate -- Groove constraint space -- Laser-MIG hybrid welding -- Plasma; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2019.11.004
• Languages: English
• ISSNs: 1526-6125

Abstract

Abstract: Laser-MIG hybrid welding with groove shows great potential in thick plate joining. However, the plasma behaviors influenced by the groove space are not well understood. In this paper, special stair-stepping plates with groove were designed to form different groove configurations, and the effects of groove depth on the plasma characteristics were investigated systematically. The results showed that the plasma temperature decreased from 10, 589 K to 8, 527 K and the electron density increased from 1.30 × 10 16 cm −3 to 1.44 × 10 16 cm −3, when the groove depth increased from 0 to 20 mm. The reason may be that more laser-induced metal vapor, cooler than arc plasma, cannot leave the deeper groove space in time. The heat convection and radiation between the vapor and plasma resulted in the temperature decrease. Besides, as the groove constraint space increased, the plasma profile, frequency of droplet-transfer and weld width decreased, while the penetration depth increased to some extent. This research results would be inspirational and meaningful to the laser-arc hybrid welding of medium and thick plate.