Microstructure characteristics of laser–MIG hybrid welded mild steel

Gao, Ming; Zeng, Xiaoyan; Yan, Jun; Hu, Qianwu

doi:10.1016/j.apsusc.2008.03.070

Cited by 92 publications

(54 citation statements)

References 19 publications

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“…In this development work, one of the fundamental issues is to understand the relation between microstructural quantities and material properties. This is especially challenging for advanced joining methods such as laser welding, where the properties of the narrow joint differ significantly from those of the base material [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Lehto

Remes

Saukkonen

et al. 2014

Materials Science and Engineering: A

193

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The strength of polycrystalline metals increases with a decrease in grain size according to the HallPetch relationship. However, heterogeneous microstructures deviate from this relationship depending on the distribution of grain sizes. This paper introduces a rule of mixtures based approach for determining the characteristic length of the microstructure for heterogeneous weld metal. The proposed grain size parameter, the volume-weighted average grain size, is measured experimentally for nine structural steel weld metals and two base materials. The weld metals are found to have a large variety of grain size distributions that are noticeably broader than those of the base material due to differences in phase contents. The results show that the volume-weighted average grain size is able to capture the influence of grain size distribution on the strength of welded structural steel. Based on the experimental results, a modified Hall-Petch relationship is formulated for the strength prediction of heterogeneous microstructures. The modified relationship is also found to be applicable to data from the literature.

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Section: Introductionmentioning

confidence: 99%

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Lehto

Remes

Saukkonen

et al. 2014

Materials Science and Engineering: A

193

View full text Add to dashboard Cite

show abstract

“…[7][8][9][10] For these advantages, hybrid methods can be easily applied to welding process as couple of welding method, such as laser-arc, laser-TIG, laser-MIG and laser-FSW. [7][8][9][10][11] A recent report showed that HFSW is faster than the conventional method for materials with high melting points, such as steels, because of the reduced downward force between material and tool.…”

Section: Introductionmentioning

confidence: 99%

Development of Microstructure and Mechanical Properties in Laser-FSW Hybrid Welded Inconel 600

2009

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The present study was carried out to evaluate the microstructure and mechanical properties of Inconel 600 subjected to laser-assisted hybrid friction-stir welding (HFSW). In this process, friction-stir welding (FSW) was performed at a constant speed (400 rpm) while a 2-kW YAG laser preheated the material just in front of the rotating tool. We found that HFSW was 1.5 times faster than conventional FSW. In addition, analysis of the grain boundary character distribution by electron back scattered diffraction (EBSD) showed that the increased welding speed and dynamic grain recrystallization caused the average grain size to decrease from 5.5 mm (in the base material) to 3.2 mm (in the stir zone of the welded specimen). This grain refinement led to 30% and 10% improvements in microhardness and tensile strength, respectively.

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“…Both Ti6Al4V and lead were melted at this zone and formed a mixed fusion zone. Gao et al (2008) have reported that temperature gradient of the central zone of the molten pool irradiated by laser beam was higher than that of the zone next to the molten pool wall. According to this conclusion, the temperature gradient in mixed fusion zone was much higher than that of the liquid lead zone.…”

Section: Interface Formation In Molten Poolmentioning

confidence: 99%

Microstructural and mechanical characteristics of laser welding of Ti6Al4V and lead metal

Zhao

et al. 2012

Journal of Materials Processing Technology

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a b s t r a c tTitanium alloy Ti6Al4V and lead metal were welded using a continuous wave Nd:YAG laser. The influences of laser power, scanning velocity, and laser beam offset on weld morphology were investigated. Microstructure, chemical composition and mechanical properties of the joints were evaluated. Experimental results showed that fusion weld formed at the upper part of the weld and brazing weld with solder of Pb formed at the lower part of the weld under appropriate process condition. Interfaces were formed between mixed fusion zone and liquid lead zone in molten pool during laser welding of Ti6Al4V and lead. Reasons for interface formation may be different driving force of various regions in molten pool, and the miscibility gap of Ti and Pb binary system. Ti-Pb intermetallic compound Ti 4 Pb was detected at the fusion weld zone, which made the microhardness of the weld seam was higher than that of the base materials. The strength of the joint was at least equal to or larger than that of lead base material.

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Microstructure characteristics of laser–MIG hybrid welded mild steel

Cited by 92 publications

References 19 publications

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Development of Microstructure and Mechanical Properties in Laser-FSW Hybrid Welded Inconel 600

Microstructural and mechanical characteristics of laser welding of Ti6Al4V and lead metal

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