Effect of welding current on morphology and microstructure of Al alloy T-joint in double-pulsed MIG welding

Yang, Jie; Cao, Shufen; Li, Luoxing; Guo, Pengcheng; Liu, Kaiyong

doi:10.1016/s1003-6326(15)63953-x

Cited by 41 publications

(16 citation statements)

References 15 publications

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“…The optimum value of duty cycle was resulted 50% improvement in grain refinement for AZ31B magnesium alloy 49) . It is also observed the interaction effect of background current and peak current for grain size at fusion zone of AA6061 52) . There was no appreciable change in macrostructure of weld joint found due to variation of background current for AZ61A magnesium alloy 50) .…”

Section: Effect Of Pulsed Parameters On Metallurgical Propertiesmentioning

confidence: 81%

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A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Shah

Agrawal

2019

Journal of Welding and Joining

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Tungsten Inert Gas (TIG) welding process is used in the industry due to its positional suitability, good control over metallurgical and mechanical properties and weld integrity. It makes this process more suitable to weld the root pass in the piping industries. However, there is a remarkable limitation to increase the welding current beyond a certain limit in the conventional TIG welding process due to limited current carrying capacity of a single electrode and higher arc pressure. This limits its productivity. To combat it, Twin TIG (T-TIG) welding process is introduced where the two tungsten electrodes are present in one torch. The two separate and synchronized power sources are connected to the two electrodes. To increase the metal deposition rate, the hot filler wire is used because it reduces the requirement of heat from arc plasma. There is another advancement in the TIG welding process which incorporates pulsed power source assisted welding process to control weld bead geometry, microstructure and to weld dissimilar material. This paper presents the effect of parameters of T-TIG, hot wire, and pulsed current welding processes when performed separately. A novel welding set up is proposed to weld dissimilar material with weld integrity. This paper suggests that when these three techniques are used simultaneously by meticulous studies of their process parameters with automation, an outperformed technique can be evolved which multiples the individual advantages of the three processes.

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Section: Effect Of Pulsed Parameters On Metallurgical Propertiesmentioning

confidence: 81%

“…if the value of peak current is varied marginally near the optimum value, the change in tensile strength is more 51) . Up to certain level if peak current along with pulse frequency (up to 6Hz) is increased, impact strength of weldment is increased for titanium alloy 52,48) . Sr.No.…”

Section: Pulsed Power Source Parameters Influencing Weld Bead Propertmentioning

confidence: 99%

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Shah

Agrawal

2019

Journal of Welding and Joining

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“…Considering the different levels of importance of above confirmed evaluation index elements, after consulting experienced experts and examined relative materials, corresponding weights set was shown in Equation 6: W = {0.3, 0.3, 0.2, 0.06, 0.07, 0.07} (6) Step3: Establish the evaluation results set V.…”

Section: Evaluation Proceduresmentioning

confidence: 99%

“…Also, the process has better gap bridging ability [3], and better ability to control the mode of droplet transfer than those of the P-GMAW process [4]. This new technique is an effective variation of the traditional P-GMAW process, in which the pulsing current aiming to metal transfer control is overlapped by a thermal pulsation [5], which induces changes of temperature and stress of the welding pool [6]. Hence, it has been paid more and more attention in academic research and actual industrial production areas in recent years.…”

Section: Introductionmentioning

confidence: 99%

Process and Parameter Optimization of the Double-Pulsed GMAW Process

Yao

Zhou

Huang

2019

Metals

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The double pulsed gas metal arc welding (DP-GMAW) process has been effectively employed to realize joining of steel plates and obtain weld bead surfaces with high quality fish scale ripples. In this work, a DP-GMAW process based on robot operation using the latest twinpulse XT DP control technology was employed to join the stainless-steel base plates. Four key operational parameters, which were robot welding speed, twin pulse frequency, twin pulse relation and twin pulse current change in percent, were selected to be input elements of orthogonal experimental design, which included nine experiments with three levels. To accurately understand the performance and process of weld bead obtained from DP-GMAW operation based on robot operation, the appearance observation and key shape parameters measurement, microstructure analysis, tensile and hardness testing, as well as stability analysis of the electrical signals, were conducted. Correlation analysis showed that the grain size was significantly correlative to the toughness and hardness. Then, to obtain quantitative evaluation results, fuzzy comprehensive evaluation (FCE) was employed to provide quality evaluation of weld beads from the above experiments. The influential levels of the key operational parameters on the appearance, grain size and FCE scores, and corresponding physical analyses, were respectively presented. In addition, optimal parameters combinations for obtaining weld beads with optimal appearance, grain size, and the highest FCE scores of weld bead quality were respectively provided according to the range analysis of the results from orthogonal experimental design. This work can provide an effective analysis method of influential levels of key operational parameters on the performance of the weld bead, optimal operational parameters combination seeking method, and quantitative quality evaluation method for the DP-GMAW process, which can improve the process optimization and increase the production efficiency, both in academic research and actual industrial production.

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“…Researchers have made numerous attempts to mitigate these defects. Double pulsed gas metal arc welding (DP-GMAW) is a novel welding method in the manufacturing process [8]. Compared with conventional pulsed GMAW (CP-GMAW), DP-GMAW features many advantages, such as reduced porosity incidence, and improved solidification cracking susceptibility [9].…”

Section: Introductionmentioning

confidence: 99%

Perspective on Double Pulsed Gas Metal Arc Welding

Wang

Xue

2017

Applied Sciences

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Aluminum alloy welding suffers from problems such as solidification cracking and hydrogen-induced porosity, which are sufficiently severe to limit its potential applications. Because mitigated porosity incidence and solidification cracking are observed in aluminum welds using double pulsed gas metal arc welding (DP-GMAW), a comprehensive review of the mechanism is necessary, but absent from the literature. The oscillation of arc force and droplet pressure causes a weld pool stir effect. The expansion and shrinkage of the weld pool cause unusual remelting and resolidification of the previously solidified metal. DP-GMAW has an increased solidification growth rate and cooling rate, compared with conventional pulsed welding at same heat input. Both numerical and experimental results reveal the remarkable concept that refined microstructure in the fusion zone is obtained by using DP-GMAW. The mechanism of microstructural refinement is revealed as a weld pool stir effect and increased cooling rate. Hydrogen bubbles easily float out and then release from the weld pool originated from the weld pool stir effect. Reduced solidification cracking is achieved due to the refined solidification structure that originated from the increased cooling rate. The advantages, evolution process, and future trend of DP-GMAW are discussed.

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Effect of welding current on morphology and microstructure of Al alloy T-joint in double-pulsed MIG welding

Cited by 41 publications

References 15 publications

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Process and Parameter Optimization of the Double-Pulsed GMAW Process

Perspective on Double Pulsed Gas Metal Arc Welding

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