Analysis on Thermal Efficiency and Softening Behavior of MIG Welding with Longitudinal Magnetic Field

Zhu, Shuang; Wang, Qi Wei; Wang, Xiao Ming; Han, Guo Feng

doi:10.4028/www.scientific.net/amr.148-149.326

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…This results in a decrease in the temperature of the molten pool and droplet surface. The resulting increase in surface tension suppresses the spreading of droplets, thus leading to a large wetting angle (Wu et al , 2016; Liu et al , 2010; Shoichi et al , 2013).…”

Section: Changed Molten Pool Dynamicsmentioning

confidence: 99%

Forming accuracy improvement in wire arc additive manufacturing (WAAM): a review

Dong

Miao

et al. 2022

RPJ

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Purpose This paper aims to anticipate the possible development direction of WAAM. For large-scale and complex components, the material loss and cycle time of wire arc additive manufacturing (WAAM) are lower than those of conventional manufacturing. However, the high-precision WAAM currently requires longer cycle times for correcting dimensional errors. Therefore, new technologies need to be developed to achieve high-precision and high-efficiency WAAM. Design/methodology/approach This paper analyses the innovations in high-precision WAAM in the past five years from a mechanistic point of view. Findings Controlling heat to improve precision is an effective method. Methods of heat control include reducing the amount of heat entering the deposited interlayer or transferring the accumulated heat out of the interlayer in time. Based on this, an effective and highly precise WAAM is achievable in combination with multi-scale sensors and a complete expert system. Originality/value Therefore, a development direction for intelligent WAAM is proposed. Using the optimised process parameters based on machine learning, adjusting the parameters according to the sensors’ in-process feedback, achieving heat control and high precision manufacturing.

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Section: Changed Molten Pool Dynamicsmentioning

confidence: 99%

Forming accuracy improvement in wire arc additive manufacturing (WAAM): a review

Dong

Miao

et al. 2022

RPJ

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“…Few reported investigations have quantified melting efficiency. Zhu et al [20] developed a melting efficiency expression in terms of melting energy of fusion zone and total energy transferred to workpiece in GMAW. Walsh et al [21] developed an empirical relation of melting efficiency using cross-sectional area of fusion zone, welding speed, laser output power, and change in enthalpy of a high-power diode-laser.…”

Section: Mathematical Formulation For Calculation Of Melting Efficiencymentioning

confidence: 99%

Performance Evaluation of Alternating Current Square Waveform Submerged Arc Welding as a Candidate for Fabrication of Thick Welds in 2.25Cr-1Mo Heat-Resistant Steel

Mohanty

Abe

Fujimoto

et al. 2020

Journal of Pressure Vessel Technology

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The paper evaluates the performance of alternating current (AC) square waveform submerged arc welding (SAW) as a candidate technology for manufacturing thick welds for high-pressure vessels. A new mathematical formulation for calculating melting efficiency in square waveform arc welding is presented. The melting efficiency and the heat consumption are presented as a mathematical model of welding parameters, namely welding current, welding speed, current frequency, and electrode negativity (EN) ratio. The proposed approach is demonstrated through the welding of 2.25Cr-1Mo heat-resistant steel performed over a wide range of welding parameters. The investigation provides deeper insights into the interplay between process parameter, total heat consumption, and melting efficiency. The effect on flux consumption is also explained. The melting efficiency is inversely proportional to flux consumption. The welding heat does not necessarily promote the plate melting. Improper use of welding heat may lead to decreased melting efficiency and increased unwanted melting and consumption of welding flux. Compared to the conventional direct current (DC) power sources, the AC square waveform welding achieves almost the same order of melting efficiency with added advantages of better weld bead shape and flux consumption in a desirable range. The two additional parameters (frequency and EN ratio) of the AC square waveform power source provide more freedom to fine-tune the process and thereby efficiently use welding heat. The results of this investigation will be advantageous to the designers and fabricators of high-pressure vessels using AC square waveform welding.

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“…Liu et al [10] signi cantly improved the structure and properties of aluminum alloys by using alternating magnetic eld aging treatment. Zhu et al [11] studied the changes of microstructure and mechanical properties with excitation current. Therefore, based on the CMT+P method and the longitudinal magnetic eld, it is of great signi cance to study the in uence of the magnetic eld on the surface forming and microstructure properties of WAAM parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of external magnetic field on morphology and microstructure of wire arc additive manufacture

Zhao¹,

Li²,

Sun³

et al. 2022

Preprint

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The longitudinal magnetic field assisted CMT+P process is used for arc fuse additive manufacturing of aluminum alloy. Analyze the forming and organization properties of additive components. The excitation frequency is 40Hz ~ 70Hz, and the excitation current is 4A ~ 8A, during the additive manufacturing process. The results show that the external magnetic field can improve the forming and organization properties of the material, but the size of the magnetic field has a reasonable matching interval. The optimal parameter is when the excitation frequency is 50Hz and the excitation current is 5A. The influence of the magnetic field promotes the flow process in the molten pool, increases the homogenization of alloying elements, reduces the temperature gradient and promotes the equiaxed crystallization and refinement of crystal grains. The surface tension of the molten pool is weakened under the action of an external magnetic field. The size and frequency of the magnetic field affect the stability of the molten pool flow and the crystallization of the molten pool.

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Analysis on Thermal Efficiency and Softening Behavior of MIG Welding with Longitudinal Magnetic Field

Cited by 7 publications

References 4 publications

Forming accuracy improvement in wire arc additive manufacturing (WAAM): a review

Forming accuracy improvement in wire arc additive manufacturing (WAAM): a review

Performance Evaluation of Alternating Current Square Waveform Submerged Arc Welding as a Candidate for Fabrication of Thick Welds in 2.25Cr-1Mo Heat-Resistant Steel

Effect of external magnetic field on morphology and microstructure of wire arc additive manufacture

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