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JWJ > Volume 39(2); 2021 > Article
Journal of Welding and Joining 2021 April;39(2) :174-181.
Published online April 13, 2021.
doi:https://doi.org/10.5781/JWJ.2021.39.2.6
The Effect of EN Pulsing Ratio and Repetition Frequency on the Bead Appearance and Microstructure Evolution in Aluminum Welding using Variable Polarity GMAW
Minjung Kang*, Jason Cheon*, Tae Hyun Lee*,**
*Advanced Functional Technology R&D Department, Korea Institute of Industrial Technology, Incheon, 21999, Korea
*,**Department of Mechanical Design Engineering, Hanyang University, Seoul, 04763, Korea
Correspondence: Minjung Kang  Email: kmj1415@kitech.re.kr
Received October 13, 2020  Revised January 18, 2021  Accepted January 28, 2021  Published online April 13, 2021
ABSTRACT
This study addressed the gas metal arc welding (GMAW) of Al 5183 aluminum alloy using variable polarity (VP). The effects of the electrode negative (EN) pulsing ratio and repetition frequency on the geometrical features and microstructural evolution of the deposited materials were investigated and discussed. The current and voltage were manually controlled independently for each phase to evaluate the effect of the polarity change. The influence of phase and its changing frequency on the geometrical features and microstructure evolution were observed. The phase of the electrode affected the arc concentration and changed the amount of the deposited material and the dilution between the substrate. The EN phase is beneficial for making a finer structure than the electrode positive (EP) phase because of the lower heat input per unit mass. In addition, the size of the grains decreased as the phase change frequency increased. When the number of repetitions frequency increased within a cycle, the size of the microstructure was reduced. Consequently, strategies can be established to minimize the microstructure with VP-GMAW welding using a high EN pulsing ratio and low repetition conditions.
Keywords: Variable polarity | Gas metal arc welding | EN pulsing ratio | Repetition | Microstructure refining | aluminum
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