Compared with using semi-automatic gas shielded arc welding, using automatic TANDEM twin wire welding and twin wire gas metal arc welding (GMAW) to weld Q690 steel, a low-alloy high-strength structural steel used in the hydraulic support in the fully-mechanized mining face, the welding speed, deposition rate, production environment and welding quality can be obviously improved. Compared with GMAW twin wire welding, a refined microstructure in the weld and heat-affected zone (HAZ), narrow HAZ and improved joint strength were achieved with TANDEM on Q690. Also, due to the push-pull pulsed way in TANDEM welding, the droplet transfer, distribution on heat flow and interaction between two arcs were completely different from those in GMAW twin wire system. The heat input of TANDEM is only about 766% of GMAW, and correspondingly, the welding speed and welding seam can be obviously improved. The complete oscillation caused by TANDEM pulsed current occurred in the welding pool, which refined the grains in the microstructure. The results show that TANDEM twin wire welding is very suitable in the welding of Q690 used in the hydraulic support.
参考文献
[1] | |
[2] | Zhang Weiqun. Welding technology of Q690 high-strength steel plates[J]. Metal processing (heating), 2008,(22): 52~53.(in Chinese)[2] Did-ling L A,Michael S,Ladwing B.High-quality and economically viable coating by means of tandem gas-shielded metal-arc welding[J].Welding and Cutting,2002, (5):18-23.[3] Platz J.Two-wire technique increases the speed in MIG welding[J].Zvaranje,1996,45(6):46~49. [4] Tim Morehead.Automatic multi-wire GMAW multiplies productivity[J].Welding Journal,2003, 82(6):40~43.[5] Lu Quansen. Finite element simulation of temperature field during twin wire push-pull MIG welding [D].Tianjin: Tianjin university,2007. (in Chinese)[6] Dong Kequan, Liu Chaoying, Xiao Qijun. Study of heat source model for temperature field simulation in double wire welding processes[J]. Thermal processing, 2006, 35(3): 50~52. (in Chinese)[7] Danut. Electromagnetic interaction in two-wires in MIG/MAG welding[C]. Institute of Welding and Material Testing(ISIM), Timisoara RO, 1996.[8] Fen Lei, Chen Shujun, Yin Shuyan. Mechanism of undercut phenomenon in high speed welding. [J]. Transactions of the China Welding Institution, 1999, 20(1): 16~21. (in Chinese)[9] Feng Lei, Chen Shujun, Ding Jingzhu. Stability of molten pool and bead formation in high-speed CO2 welding[J]. Transactions of the China Welding Institution,1999,20(3): 164~169. (in Chinese)[10] Fan ding, Chen Jianhong, Masao Ushio. Numerical analysis of the heat and mass transfer process for TIG arc [J]. Chinese Journal of Mechanical Engineering, 1998, 34(2): 39~45. (in Chinese)[11] Wang W, Liu S, Jones J.E. Flux cored arc welding arc signals, processing and metal transfer characteristics[J]. Welding Journal, 1995, 75(4): 7~10. |
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