Characteristics of droplet transfer, molten pool formation, and weld bead formation of oscillating laser hot-wire tungsten inert gas hybrid welding

2021 ◽  
Vol 33 (1) ◽  
pp. 012027
Author(s):  
Chengyuan Ma ◽  
Bo Chen ◽  
Caiwang Tan ◽  
Xiaoguo Song ◽  
Jicai Feng
Keyword(s):  
Molten Pool ◽  
Weld Bead ◽  
Inert Gas ◽  
Hybrid Welding ◽  
Hot Wire ◽  
Droplet Transfer ◽  
Bead Formation ◽  
Weld Bead Formation ◽  
Pool Formation

Investigation of molten pool behavior and weld bead formation in VP-GTAW by numerical modelling

2016 ◽  
Vol 111 ◽  
pp. 600-607 ◽  
Author(s):  
Jiajing Pan ◽  
Shengsun Hu ◽  
Lijun Yang ◽  
Dongpo Wang
Keyword(s):  
Numerical Modelling ◽  
Molten Pool ◽  
Weld Bead ◽  
Bead Formation ◽  
Weld Bead Formation

scholarly journals Study on the weld bead formation on square-groove butt joint using plasma-MIG hybrid welding process

2020 ◽  
Vol 38 (2) ◽  
pp. 135s-138s
Author(s):  
Kazuya ISHIDA ◽  
Shinichi TASHIRO ◽  
Masami MIZUTANI ◽  
Manabu TANAKA
Keyword(s):  
Welding Process ◽  
Butt Joint ◽  
Weld Bead ◽  
Hybrid Welding ◽  
Bead Formation ◽  
Weld Bead Formation

scholarly journals Effects of Arc Length Adjustment on Weld Bead Formation and Droplet Transfer in Pulsed GMAW Based on Datum Current Time

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 665 ◽  
Author(s):  
Peizhuo Zhai ◽  
Songbai Xue ◽  
Jianhao Wang ◽  
Weizhong Chen ◽  
Tao Chen ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Weld Bead ◽  
Arc Length ◽  
Droplet Transfer ◽  
Current Time ◽  
Bead Formation ◽  
Weld Bead Formation ◽  
Multiple Pulses ◽  
Short Arc ◽  
Transfer Zone

The characteristics of weld bead formation and droplet transfer in pulsed gas metal arc weld (GMAW) with different arc lengths were studied by changing the base current time in this work. The results showed that it was easier to cause short circuits and spatters with a short arc. However, the deviation between the deepest point of penetration and the center of bead will be aggravated with the increase of arc length. In addition, more than 90% “one drop per pulse” (ODPP) transfer mode can be obtained when the pulse parameters were selected properly. However, the short arc trended to rise the proportion of “multiple drops per pulse” (MDPP), and the long arc trended towards increasing the proportion of “one drop per multiple pulses” (ODMP). Additionally, with the growth of the arc in the projected transfer zone, the penetration tended to become shallower because of the increase of arc heat dissipation, the fall of arc energy density, and droplet impact force. Overall, the strategy of choosing suitable arc length of pulsed GMAW was summarized: in order to obtain high-quality bead formation and weld joints, a shorter arc in the projected transfer zone was recommended.

scholarly journals The potential of wire feed pulsation to influence factors that govern weld penetration in GMA welding

2020 ◽  
Vol 110 (9-10) ◽  
pp. 2685-2701 ◽  
Author(s):  
Vinicius Lemes Jorge ◽  
Fernando Matos Scotti ◽  
Ruham Pablo Reis ◽  
Américo Scotti
Keyword(s):  
Weld Pool ◽  
Weld Bead ◽  
Feed Speed ◽  
Pulsation Frequency ◽  
Droplet Transfer ◽  
Bead Formation ◽  
Weld Bead Formation ◽  
The Wire ◽  
Welding Processes ◽  
Wire Feed

Abstract Derivative welding processes are in many cases capable of altering phenomena that determine fundamental aspects of weld bead formation. Some of these evolutions act over the wire feed dynamics. However, in this scenario, the effects of the wire feed pulsation on the weld bead formation governing factors have not been fully explored yet. Therefore, this work aimed at examining how a wire feed pulsation approach affects the droplet transfer in gas metal arc welding and how its interaction with the molten pool defines the weld bead penetration. Bead-on-plate weldments were produced by varying the wire feed pulsation frequency, yet keeping the same levels of arc energy and wire feed speed, with the power source operating in constant voltage and current modes. To assess the droplet transfer behavior, high-speed imaging was used. The geometry of the weld beads was compared in terms of fusion penetration. The results showed that an increase in the wire feed pulsation frequency intensifies the detachment frequency of the droplets, being possible to accomplish a stable metal transfer with them straightly projected toward the weld pool, which contributed to a centralized-increased penetration profile. Based on a descriptive model, it was demonstrated that the increase in droplet momentum or kinetic energy, due to the wire feed pulsation, was not enough to justify the penetration enhancement. It was concluded that the wire feed dynamics can also stimulate surface tension variations in the weld pool and therefore disrupt the behavior of its mass and heat convection, supporting fusion penetration.

The chemistry of TIG weld bead formation

2015 ◽  
Vol 29 (10) ◽  
pp. 771-782 ◽  
Author(s):  
Paulo J. Modenesi
Keyword(s):  
Weld Bead ◽  
Bead Formation ◽  
Weld Bead Formation
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