Study on droplet transfer and weld quality in laser-MIG hybrid welding of 316L stainless steel

Gao, Zhongmei; Jiang, Ping; Wang, Chunming; Shao, Xinyu; Pang, Shengyong; Zhou, Qi; Li, Xiongbin; Wang, Yilin

doi:10.1007/s00170-016-8774-2

Cited by 23 publications

(7 citation statements)

References 29 publications

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“…The heat input (Q) is mixed by the laser heat input (Q laser ) and the arc heat input (Q arc ). Q can be expressed by the following equation [23]:…”

Section: The In Uence Of Emf On Laser-mig Energy and Molten Poolmentioning

confidence: 99%

Effect of transverse magnetic field on microstructure and mechanical properties of Ti-6Al-4 V manufactured by Laser-MIG hybrid welding

Chen

Yin²

2022

Int J Adv Manuf Technol

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In this paper, the external transverse magnetic eld is used to assist the laser-MIG hybrid welding for Ti-6Al-4V (TC4). The microstructure and mechanical properties such as microhardness and tensile properties of the weld joints under 24 mT external magnetic eld (EMF) and the referring weld joint without EMF are investigated and discussed. Results show that transfer layer (TL) performs the lowest microhardness in the weld seam and tensile specimens fail in this area for the referring weld joint without EMF, which indicates the TL is the weakest zone in the weld seam. The mechanical properties of weld seam improve signi cantly under 24 mT EMF, which average microhardness in TL increases 9.3% and failure stress of tensile specimens improve by 16.7%, whilst a mixed fracture mode is operative in the fracture surfaces. The research reveals the elementary microstructure of TC4 laser-MIG hybrid welding is in correlation to welding heat input under the in uence of EMF.

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“…The heat input (Q) is mixed by the laser heat input (Q laser ) and the arc heat input (Q arc ). Q can be expressed by the following equation [23]:…”

Section: The In Uence Of Emf On Laser-mig Energy and Molten Poolmentioning

confidence: 99%

Effect of transverse magnetic field on microstructure and mechanical properties of Ti-6Al-4 V manufactured by Laser-MIG hybrid welding

Chen

Yin²

2022

Int J Adv Manuf Technol

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“…The heat input (Q) is mixed by the laser heat input (Qlaser) and the arc heat input (Qarc). Q can be expressed by the following equation [5]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The direction of Fem is determined by the arc characteristics and the position of the droplet, whose direction is parallel to the arc direction. The value of Fem can be calculated by the formula (5). The Fσ acts on the interfaces among solid, liquid and gas.…”

Section: Analysis For the Influence Of Magnetic Field On Droplet Transfer Behaviormentioning

confidence: 99%

Effect of transverse magnetic field on arc characteristics and droplet transfer during laser-MIG hybrid welding of Ti-6Al-4 V

Chen

Yin

Huang

2021

Int J Adv Manuf Technol

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In this study, the effect of the transverse magnetic field on the arc characteristics and droplet transfer behavior is investigated during Laser-MIG hybrid welding of Ti-6Al-4V. Especially, transverse magnetic fields with 0 mT, 8 mT, 16 mT, 24 mT, and 32 mT are studied. Results indicate that an appropriate magnetic field can increase the stability of arc characteristics, improve the droplet detachment efficiency, and reduce the welding defects such as incomplete fusion and undercut. By applying 24 mT transverse magnetic field, the maximum arc area can decrease by 48.7% with its variance changing from 2.81 mm 2 to 1.06 mm 2 , indicating that an appropriate transverse magnetic field can shrink the arc and improve its stability. The reason of arc shrinkage is that the electric streamline in the arc rotates away from the laser side to the droplet side due to the influence of external magnetic field. On the other hand, the droplet transfer process become more uniform under the appropriate magnetic field. This phenomenon is mainly attributed to the change of Lorentz force direction during droplet rotation, which resultantly increases effective detachment energy. This phenomenon leads to the reduction of the contact time between droplet and molten pool. The droplet transfer form changes from short-circuit transfer to meso-spray transfer under 24 mT magnetic field because of the reduction of the contact time. Therefore, the incomplete fusion and undercut disappears. At last, the appropriated magnetic field parameters during the laser-MIG parameters (2 kW, 160 A, 2 m/min) is concluded as B =24 mT.

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“…Fusion welding is the most widely used method of welding in various industrial fields owing to its mature technology, simple operation, easy automation and other advantages. Gao et al [10] comparatively studied the butt welding of 316L stainless steel plate with a thickness of 5.5 mm by laser-gas metal arc (GMA) and laser welding and found that microstructures in the laser-GMA weld zone(WZ) mainly consisted of columnar and equiaxed dendrites, while only columnar dendrites could be observed in the laser WZ. The ratio of temperature gradient to cooling rate in WZ center influenced by laser and arc was considered smaller than that of keyhole zone center; therefore, more equiaxed dendrites existed.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and corrosion behavior of austenitic stainless steel sheet joints welded by gas tungsten arc (GTA) and ultrasonic–wave–assisted gas tungsten pulsed arc (U–GTPA)

Xie

Yang

2020

Archiv.Civ.Mech.Eng

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Here, ultrasonic-wave-assisted gas tungsten pulsed arc (U-GTPA) welding is proposed as a new alternative welding process to gas tungsten arc (GTA) welding. To better understand the advantages of this new process, in this paper, the microstructure, mechanical properties and corrosion behavior of GTA-and U-GTPA-welded joints of 316L stainless steel are systematically compared. These results show that the weld zone (WZ) depth-to-width ratio of the U-GTPA-welded joint increased, and the area of the equiaxed grain zone was larger than that of the GTA-welded joint. This results in finally increasing the strength and hardness for U-GTPA-welded joints, and the ultimate tensile strength and elongation of the U-GTPA-welded joints were 7.1% and 26.2% greater than those of the GTA-welded joint, respectively. For the U-GTPA-welded joint, under the action of the pulsed arc, the grain distribution with high-angle boundaries (HABs) was different from that of the GTA-welded joint. The minimum of the HAB fraction corresponded to the fracture position for both joints in tensile tests. It shows that a large number of HABs were beneficial in improving joint tensile properties. However, for electrochemical corrosion experiments of two WZs in 3.5% NaCl solution, despite this GTA WZ having a higher HAB fraction, the corrosion current density and corrosion potential of U-GTA WZ were lower and higher than those of the GTA WZ, respectively. The corrosion rate and corrosion sensitivity of U-GTPA WZ indicated good corrosion resistance.

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Study on droplet transfer and weld quality in laser-MIG hybrid welding of 316L stainless steel

Cited by 23 publications

References 29 publications

Effect of transverse magnetic field on microstructure and mechanical properties of Ti-6Al-4 V manufactured by Laser-MIG hybrid welding

Effect of transverse magnetic field on microstructure and mechanical properties of Ti-6Al-4 V manufactured by Laser-MIG hybrid welding

Effect of transverse magnetic field on arc characteristics and droplet transfer during laser-MIG hybrid welding of Ti-6Al-4 V

Microstructure, mechanical properties and corrosion behavior of austenitic stainless steel sheet joints welded by gas tungsten arc (GTA) and ultrasonic–wave–assisted gas tungsten pulsed arc (U–GTPA)

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