Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1663-1668.doi: 10.13229/j.cnki.jdxbgxb20190580

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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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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

CLC Number: 

  • TG455

Table 1

Welding parameters"

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

Fig.1

Schematic of acquisition system"

Fig.2

Current and voltage waveforms with various EP/EN"

"

"

"

Fig.4

Weld beads of different samples"

Fig.5

Weld depth and reinforcement of different samples"

Fig.6

Contact angle of different samples"

Fig.7

Heat input of different samples in different periods"

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