Tri-Arc双丝焊"Γ"形电弧及其促进方法
"Γ"shaped arc and its promotion method in Tri-Arc dual wire welding
钟蒲 1李亮玉 1任国春 1王天琪 1郭东波1
作者信息
- 1. 天津工业大学,天津市现代机电装备技术重点实验室,天津, 300387
- 折叠
摘要
Tri-Arc双丝三电弧焊通过中间第 3弧的M弧重新分配焊接热输入,实现高熔覆率低热输入焊接.M弧与主电弧耦合,在整个动态周期表现为"Γ"形和"μ"形及其镜像形态.该文研究"Γ"形电弧的形成机理和热输入调控机制,结果表明,"Γ"形态由"μ"形态转变而来,熔滴振荡引起焊丝末端间距的变化,从而促进耦合电弧"Γ"形态的形成,此时M弧不作用于母材,比"μ"形电弧焊接热输入更低.为提高Tri-Arc双丝焊接低热输入效果,在维持导电嘴末端到工件距离不变的前提下,提高焊枪枪体抬升距离从而改变焊丝末端间距.当导电嘴长度由 30 mm增加至35 mm时,随着焊枪抬升,"Γ"形电弧作用时间逐渐增加,能更好地促进电弧热分配,降低Tri-Arc双丝焊接热输入,从而降低熔池最高温度,获得更小宽高比和更小熔深的焊缝.
Abstract
The Tri-Arc dual wire welding achieves a high de-position rate and low heat input by redistributing the heat input through an intermediate third arc called M-Arc.The M-arc is coupled to the main arc and exhibits"Γ"and"μ"shapes and their mirror images throughout the dynamic cycle.In this pa-per,the formation mechanism of the"Γ"-shaped arc and the heat input regulation mechanism are investigated first.The res-ults indicate that the"Γ"shape evolves from the"μ"shape,the oscillation of adhered molten droplets induces a variation in the distance between two wire ends,thereby facilitating the forma-tion of"Γ"shape in the coupled arc.In this case,the M-arc does not touch the workpiece,rendering a lower heat input dur-ing welding than the"μ"-shaped arc.In order to enhance the low heat input effectiveness of the Tri-Arc dual wire welding,the alteration of the distance at two wire ends is achieved by el-evating the welding torch.Simultaneously,the length of the conductive nozzle should be increased to maintaining a con-stant distance between the tip of the conductive nozzle and the workpiece.When the length of the conductive nozzle is in-creased from 30 mm to 35 mm,as the welding torch is elev-ated,the duration of the"Γ"shaped arc phase gradually ex-tends.This extended duration effectively facilitates arc thermal distribution,consequently reducing the heat input during Tri-Arc dual wire welding.As a result,peak value of the highest temperature within the molten pool diminishes,thereby re-duced the weld bead width-to-height ratios and weld penetra-tion.
关键词
双丝三弧焊/电弧耦合/电弧形态/电弧热分配/焊接热输入Key words
tri-arc dual wire welding/coupled arc/arc shape/arc thermal distribution/weld thermal input引用本文复制引用
基金项目
国家自然科学基金资助项目(51975410)
出版年
2024
NETL
NSTL
万方数据