TANDEM and GMAW Twin Wire Welding of Q690 Steel Used in Hydraulic Support
TANDEM and GMAW Twin Wire Welding of Q690 Steel Used in Hydraulic Support
复制标题
液压支架用Q690钢的TANDEM和GMAW双丝焊接
DOI：
10.1016/s1006-706x(12)60104-6
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发表时间：
2012-05-01
影响因子：
2.5
通讯作者：
Mao Ming
中科院分区：
文献类型：
--
作者：
Fang Chen-fu;Meng Xiao-hui;Mao Ming
与半自动气体保护焊相比，采用双丝自动串联焊和双丝气体保护焊(GMAW)焊接综采工作面液压支架用低合金高强度结构钢Q690钢，焊接速度、熔敷速度、生产环境和焊接质量均有明显提高。与GMAW双丝焊相比，Q690双丝串联焊焊缝和热影响区组织细化，热影响区窄，接头强度提高。此外，由于串联焊采用推拉脉冲方式，熔滴过渡、热流分布以及两弧之间的相互作用与GMAW双丝系统完全不同。串联的热输入仅为GMAW的76.6%左右，相应地，焊接速度和焊缝可以明显提高。串联脉冲电流在熔池中产生了完全的振荡，细化了组织中的晶粒。结果表明，双丝串联焊非常适用于液压支架用Q690的焊接。
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 76.6% 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.