吉林大学学报(工学版) ›› 2020, Vol. 50 ›› Issue (5): 1663-1668.doi: 10.13229/j.cnki.jdxbgxb20190580

• 材料科学与工程 • 上一篇    

EP/EN模数对铝合金VP-CMT焊熔滴过渡及焊道成形的影响

田银宝1,2(),申俊琦1(),胡绳荪1,勾健1   

  1. 1.天津大学 材料科学与工程学院，天津 300354
    2.密歇根大学 机械工程系，安娜堡 48109
  • 收稿日期:2019-06-11 出版日期:2020-09-01 发布日期:2020-09-16
  • 通讯作者: 申俊琦 E-mail:tianyinbao@tju.edu.cn;shenjunqi@tju.edu.cn
  • 作者简介:田银宝（1988-），男，博士研究生.研究方向：CMT技术.E-mail:tianyinbao@tju.edu.cn
  • 基金资助:
    国家自然科学基金项目(51575381);天津市应用基础及前沿技术研究计划项目(15JCZDJC38600);国家留学基金委项目(201706255090)

Effect of EP/EN Balance on droplet transfer and weld formation of Al alloy by VP⁃CMT

Yin-bao TIAN1,2(),Jun-qi SHEN1(),Sheng-sun HU1,Jian GOU1   

  1. 1.School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China
    2.Department of Mechanical Engineering, University of Michigan, Ann Arbor 48109, USA
  • Received:2019-06-11 Online:2020-09-01 Published:2020-09-16
  • Contact: Jun-qi SHEN E-mail:tianyinbao@tju.edu.cn;shenjunqi@tju.edu.cn

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摘要：

利用变极性冷金属过渡技术对铝合金进行平板堆焊，改变参数EP/EN Balance以调整正/负极性的比例。通过高速摄像及电信号采集系统对熔滴过渡过程和焊接过程电信号进行采集分析。通过金相分析，研究EP/EN Balance对焊道成形的影响。结果表明：变极性冷金属过渡堆焊过程中，正极阶段的热输入明显高于负极阶段，从而实现了“冷”和“热”的交替；通过调节EP/EN Balance参数，可以改变正/负极的比例，从而对焊接热输入进行调控；利用变极性冷金属过渡技术对铝合金进行堆焊，焊道外观成性良好；随着EP/EN Balance增加，熔深和接触角增大，余高降低。

关键词: 金属材料, 铝合金, 变极性冷金属过渡, EP/EN模数, 熔滴过渡

Abstract:

Al alloy was deposited by using variable polarity cold metal transfer technique. The welding parameter of EP/EN Balance was varied to control the ratio of positive numbers to negative numbers in a weld cycle. During welding process, a high speed camera and an electrical signal acquisition system were used for observing the dynamic droplet transfer behavior and obtaining the electrical signals, respectively. The effect of EP/EN Balance on the formation of the welded joint was analyzed by the metallographic pictures. The results show that the heat input in positive period was higher than that in negative period. The alternation of “cold” and “heat” was realized during the variable polarity cold metal transfer welding process. The numbers of positive and negative periods were adjusted by altering EP/EN Balance, which could dominate the heat input to the welded joints. The weld bead with good appearance can be fabricated using variable polarity cold metal transfer technique. Weld depth and contact angle increased and reinforcement decreased with the increase in EP/EN Balance.

Key words: metallic materials, Al alloy, variable polarity cold metal transfer welding, EP/EN Balance, droplet transfer

中图分类号: 

  • TG455

表1

焊接参数"

试样编号EP/EN Balance送丝速率vf/(m·min-1)焊接速率v/(m·min-1)干伸长l/mm氩气流量q/(L·min-1)
1-250.31220
2050.31220
3250.31220

图1

采集系统示意图"

图2

不同EP/EN时电流与电压波形图"

(a)

试样1"

(b)

试样2"

(c)

试样3"

图4

不同试样的堆焊层成形"

图5

不同试样的熔深和余高"

图6

不同试样的接触角"

图7

不同试样不同阶段的热输入"

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