A study of narrow gap laser welding for thick plates using the multi-layer and multi-pass method

Li, Ruoyang; Wang, Tianjiao; Wang, Chunming; Yan, Fengyuan; Shao, Xinyu; Hu, Xiyuan; Li, Jianmin

doi:10.1016/j.optlastec.2014.04.015

Cited by 64 publications

(16 citation statements)

References 6 publications

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“…Single pass autogenous laser welding without filling any other material has been widely applied in industry [19]. However, single pass autogenous laser welding technique has many disadvantages, including the precise fit-up requirements prior to welding and the limited weld range due to limited maximum laser power available for commercial lasers (typically less than 20 kW).…”

Section: Introductionmentioning

confidence: 99%

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Guo

Dong³

et al. 2017

Optics and Lasers in Engineering

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The microstructural characteristics and mechanical properties, including micro-hardness, tensile properties, three-point bending properties and Charpy impact toughness at different test temperatures of 8 mm thick S960 high strength steel plates were investigated following their joining by multi-pass ultra-narrow gap laser welding (NGLW) and gas metal arc welding (GMAW) techniques. It was found that the microstructure in the fusion zone (FZ) for the ultra-NGLW joint was predominantly martensite mixed with some tempered martensite, while the FZ for the GMAW joint was mainly consisted of ferrite with some martensite. The strength of the ultra-NGLW specimens was comparable to that of the base material (BM), with all welded specimens failed in the BM in the tensile tests. The tensile strength of the GMAW specimens was reduced approximately by 100 MPa when compared with the base material by a broad and soft heat affected zone (HAZ) with failure located in the soft HAZ. Both the ultra-NGLW and GMAW specimens performed well in three-point bending tests. The GMAW joints exhibited better impact toughness than the ultra-NGLW joints.

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Section: Introductionmentioning

confidence: 99%

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Guo

Dong³

et al. 2017

Optics and Lasers in Engineering

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“…Laser MIG hybrid welding couples a laser beam and an arc into one process. It gives full play to their respective advantages and makes up for the shortcomings of a single heat source, which is a more efficient form of heat source [1][2][3][4]. Compared to conventional laser welding, laser MIG hybrid welding can effectively improve the gap bridging capability, obtain greater weld penetration under the condition of lower laser power, and then realize a stable and high-efficiency welding process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alternating Magnetic Field on Arc Plasma Characteristics and Droplet Transfer during Narrow Gap Laser-MIG Hybrid Welding

Cai

Zhao

et al. 2021

Metals

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In this paper, the morphological characteristics of arc plasma and droplet transfer during the alternating magnetic field-assisted narrow gap groove laser-MIG (metal inert gas) hybrid welding process were investigated. The characteristics of arc plasma and droplet transfer, electron temperature, and density were analyzed using a high-speed camera and spectrum diagnosis. Our results revealed that the arc maintained a relatively stable state and rotated at a high speed to enhance the arc stiffness, and further improved the stability of the arc under the alternating magnetic field. The optimum magnetic field parameters in this experiment were B = 16 mT and f = 20 Hz, the electron temperature was 9893.6 K and the electron density was 0.99 × 1017 cm−3 near the bottom of the groove, which improved the temperature distribution inside the narrow gap groove and eliminated the lack of sidewall fusion defect. Compared to those without a magnetic field, the magnetic field could promote droplet transfer, the droplet diameter decreased by 17.6%, and the transition frequency increased by 23.5% (owing to the centrifugal force during droplet spinning and electromagnetic contraction force). The width of the weld bead was increased by 12.4% and the pores were also significantly reduced due to the stirring of the magnetic field on the molten pool.

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“…In summary, short-cycle heat treatments as present during NGMLW are not well researched yet. Little experience is available about the impact on the microstructural developments during short-thermal-cycle treatments of laser-based techniques such as NGMLW [37]. The impact on processibility (e.g.…”

Section: Introductionmentioning

confidence: 99%

Toughness properties at multi-layer laser beam welding of high-strength steels

Volpp

Jonsén

Ramasamy³

et al. 2020

Weld World

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The material characteristics of high toughness and high strength in steel are usually not available at the same time. However, it would be an advantage if high-strength steels would show high impact toughness also at lower temperatures for applications in critical surroundings. In this paper, an approach of multi-layer welding of high-strength steel is presented in order to increase the weld-metal toughness using wire material in combination with thermal cycle modifications. Promising interlocking microstructures were found after multiple tempering of the previously applied structure at homogeneously distributed material in the weld seam. It was found that short thermal cycles during laser processing lead to insufficient time for carbon diffusion, which leads to remaining ferrite structures in contrast to the prediction of welding transformation diagrams. The additionally applied heating cycles during multi-layer laser welding induce the formation of interlocking microstructures that help to increase the weld seam toughness.

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A study of narrow gap laser welding for thick plates using the multi-layer and multi-pass method

Cited by 64 publications

References 6 publications

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Effect of Alternating Magnetic Field on Arc Plasma Characteristics and Droplet Transfer during Narrow Gap Laser-MIG Hybrid Welding

Toughness properties at multi-layer laser beam welding of high-strength steels

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