Effect of magnetic field orientation on suppressing porosity in steady-magnetic-field-assisted aluminum alloy deep-penetration laser welding

Liu, Fuyun; Wang, Houqin; Meng, Xiangyi; Tan, Caiwang; Chen, Bin; Song, Xueyu

doi:10.1016/j.jmatprotec.2022.117569

Cited by 29 publications

(6 citation statements)

References 20 publications

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“…As a result, the keyhole stability was improved, and the keyhole volume was increased, as shown in Figure 7(c). In addition, the Lorentz force in the molten pool would also bring more heat fluid to flow toward the interface of solid and fluid, leading to additional melting of solid [27]. Therefore, the length of the molten pool was increased under TMF, as suggested in Figure 7(d) [25].…”

Section: Resultsmentioning

confidence: 99%

Investigation of weld formation and porosity in 5052 aluminium alloy laser-GMA hybrid welding assisted by magnetic field with different orientations

Liu

Lin

et al. 2022

Science and Technology of Welding and Joining

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Steady magnetic field with both orientations including longitudinal magnetic field (LMF) and transverse magnetic field (TMF) was used. The influence of LMF and TMF on weld formation, porosity and mechanical property of 5052 aluminium alloy laser-gas metal arc (GMA) hybrid welding was investigated. The shielding effect of hybrid plasmas on laser energy was weakened by TMF, leading to an increase in weld depth under TMF. Porosity rate was significantly reduced to 2.61% under TMF, because keyhole stability was improved, escaping channels for bubbles were increased, and solidification time of molten pool was prolonged. As a result, the highest tensile strength (174.7 MPa) of hybrid weld was obtained at TMF, owing to the lowest porosity rate.

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Section: Resultsmentioning

confidence: 99%

Investigation of weld formation and porosity in 5052 aluminium alloy laser-GMA hybrid welding assisted by magnetic field with different orientations

Liu

Lin

et al. 2022

Science and Technology of Welding and Joining

Self Cite

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“…The hybrid welding plasmas were composed of arc plasma and laser-induced plasma in laser-MIG hybrid welding. A strong shielding effect of hybrid plasmas on the laser beam energy would be generated owing to the refraction, absorption and scattering of plasmas when the hybrid plasmas were located at the path of laser beam [14]. To investigate the effect of external ultrasonic on the hybrid welding plasmas, the hybrid welding plasma morphologies with and without the ultrasound are suggested in Fig.…”

Section: Weld Appearancementioning

confidence: 99%

Effect of ultrasonic vibration on porosity suppression and columnar-to-equiaxed transition in laser-MIG hybrid welding of aluminum alloy

Tan

Liu

et al. 2022

Int J Adv Manuf Technol

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Severe porosity and coarse columnar grain are prone to be formed in the laser-MIG welded joint of aluminum alloy, deteriorating the strength and ductility seriously. In this study, the ultrasound was designed to assist the laser-MIG hybrid welding of aluminum alloy, and the in uence of ultrasonic vibration on weld formation, porosity, and microstructure was investigated. The weld depth was increased from 3.6 mm to 4.2 mm when external ultrasound with the pressure of amplitude transformer (PAT) of 132 N was used, indicating that the penetration ability of hybrid heat sources to the welded plate could be improved. It was attributed to the dispersion effect of ultrasound on arc plasma in the laser channel. The porosity rate was reduced from 5.66-1.05% under PAT of 132 N, because of the increase in escape velocity of bubbles. Moreover, the columnar to equiaxed transformation (CET) of grain in the weld was promoted and the width of columnar grain zone was gradually reduced with the increasing ultrasonic energy, owing to the breaking effect of cavitation and the stirring effect of acoustic stream. As a result, lower porosity rate and ner grain size led to improvement of the microhardness and the strength of weld by ultrasound. The study provides more guidance on employing ultrasound to improve the quality of welded joints.

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“…Different BM surface states still affect the absorptivity and the laser energy input into the weld, affecting the dilution ratio of BM into the weld. Different dilution ratios affect the melting amount of BM as well as the hydrogen content in the melting pool [25,26]. Therefore, the study of surface pre-treatment of the SLM AlSi10Mg alloys is critical to the weld.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface pre-treatments on porosity and microstructure of laser welding in AlSi10Mg alloys sheets fabricated by selective laser melting

Wang

Cui

et al. 2023

Preprint

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The surface pre-treatment is of great significance for improving the welding quality of metal materials, especially aluminum alloys. At present, the welding process is introduced to achieve the joining of the selective laser melting (SLM) AlSi10Mg alloys or their repair during manufacturing or service. However, the high susceptibility of hydrogen pores is one of the most important problems encountered in the fusion welding process of SLM AlSi10Mg alloys. To clarify the influence of the surface state of the base metal on the hydrogen pore characteristics, the SLM AlSi10Mg alloys sheets were pretreated by chemical cleaning treatment (CCT), mechanical polishing treatment (MPT) and chemical cleaning after mechanical polishing (MPT-CCT) before autogenous laser welding. Subsequently, the hydrogen pore characteristics, microstructure and micro-hardness of the weld joints were investigated. The experimental results show that the autogenous laser welding with MPT-CCT pre-treatment conspicuously reduces the porosity and pore diameter. In addition, TEM results show that MPT-CCT pre-treatment can eliminate most of the broken and discontinuous surface oxide film and Mg enrichment. In summary, the necessity of MPT-CCT surface pre-treatment for SLM aluminum alloy parts is analyzed systematically, which is of great significance to improve the welding quality.

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Effect of magnetic field orientation on suppressing porosity in steady-magnetic-field-assisted aluminum alloy deep-penetration laser welding

Cited by 29 publications

References 20 publications

Investigation of weld formation and porosity in 5052 aluminium alloy laser-GMA hybrid welding assisted by magnetic field with different orientations

Investigation of weld formation and porosity in 5052 aluminium alloy laser-GMA hybrid welding assisted by magnetic field with different orientations

Effect of ultrasonic vibration on porosity suppression and columnar-to-equiaxed transition in laser-MIG hybrid welding of aluminum alloy

Influence of surface pre-treatments on porosity and microstructure of laser welding in AlSi10Mg alloys sheets fabricated by selective laser melting

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