Yang Ke, Wang Fei, Duan Dingshan, Zhang Tianli, Luo Chuanguang, Cressault Yann, Yu Zhishui, Yang Lijun, Li Huan
Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China.
School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Materials (Basel). 2021 Jan 14;14(2):375. doi: 10.3390/ma14020375.
Multi-wire welding has received much attention in the machinery industry due to its high efficiency. The aim of this study was to investigate a novel pulse gas metal arc welding (GMAW) that has circular triple-wire electrodes. The effect of the pulse phage angle on arc stability was particularly studied. Research showed that for typical phase angles the arc stability from low to high is 180°, 0°, and 120°, and the arcs are very stable at 120°. The triple-wire welding was used to weld a 9 mm thick Q960E steel, which is typically used for the arm of construction machinery. When the welding heat input was controlled at 1.26-1.56 kJ/mm, the weld zone was dominated by acicular ferrite, and the coarse-grained zone of the heat-affected zone was a mixed structure of lath martensite and lath bainite. The tensile strength of the welded joint reached 85% of the base metal and the impact toughness was above 62 J, which can meet the requirements of construction machinery. This indicates that the triple-wire welding has great potential to achieve efficient and high-quality welding for the construction machinery.
多丝焊接因其高效率在机械行业备受关注。本研究的目的是探究一种具有圆形三线电极的新型脉冲气体保护金属极电弧焊（GMAW）。特别研究了脉冲相角对电弧稳定性的影响。研究表明，对于典型相角，电弧稳定性由低到高依次为180°、0°和120°，且在120°时电弧非常稳定。采用三线焊接工艺对厚度为9mm的Q960E钢进行焊接，该钢常用于建筑机械的臂架。当焊接热输入控制在1.26 - 1.56kJ/mm时，焊缝区以针状铁素体为主，热影响区的粗晶区为板条马氏体和板条贝氏体的混合组织。焊接接头的抗拉强度达到母材的85%，冲击韧性高于62J，能够满足建筑机械的要求。这表明三线焊接在实现建筑机械高效、高质量焊接方面具有巨大潜力。
