Laser narrow gap welding of thick carbon steels using high brightness laser with beam oscillation

Tsukamoto, Takeshi; Kawanaka, Hirotsugu; Maeda, Yoshihisa

doi:10.2351/1.5062227

Cited by 18 publications

(5 citation statements)

References 3 publications

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“…It was demonstrated that even with a 2 mm gap between the plates' edges a reliable weld can be obtained. Similar results have since been demonstrated by other researchers [8,9].…”

Section: Introductionsupporting

confidence: 92%

Wire deposition by a laser-induced boiling front

Torkamany

Kaplan

Ghaini

et al. 2015

Optics & Laser Technology

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“…It was demonstrated that even with a 2 mm gap between the plates' edges a reliable weld can be obtained. Similar results have since been demonstrated by other researchers [8,9].…”

Section: Introductionsupporting

confidence: 92%

Wire deposition by a laser-induced boiling front

Torkamany

Kaplan

Ghaini

et al. 2015

Optics & Laser Technology

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“…Elsewhere, high-energy lasers have come into widespread use in heavy industry and technologies that use lasers as heat sources for narrow-gap butt welding have been developed. [2][3][4][5][6] The greatest merit of using a laser as a narrow-gap heat source is that the gap may be narrower than with arc welding. Since, when narrow-gap welding is performed with an arc, an electrode must be inserted into the gap, the gap must be at least 10 mm wide.…”

Section: Introductionmentioning

confidence: 99%

“…[1] A proposed method of preventing poor fusion in narrow-gap welding with a laser, by contrast, involves the use of an oscillating laser. [4,7] In this welding method, a laser head fitted with a rapidly movable internal mirror or lens is used to oscillate the laser beam at a high frequency as welding is carried out. By causing a high energy density laser beam to reach the vicinity of the end of the bottom of the gap, poor fusion can be prevented by positive melting and fusing the end of the gap.…”

Section: Introductionmentioning

confidence: 99%

Fundamental study of narrow-gap welding with oscillation laser beam

Yamazaki

Abe

Hioki

et al. 2016

Welding International

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Laser welding with oscillation laser beams enables control of the heat input distribution. In this study, we attempted to develop a narrow-gap welding process with oscillation laser welding. This process is expected to prevent a lack of fusion because the entire bottom to the groove can be melted by the oscillation laser. As the first step of the study, bead-on-plate welding experiments with an oscillation laser beam were performed to investigate the relationship between the welding conditions and welding results. The experiments revealed that the oscillation conditions strongly affect the welding penetration shape. It was clarified that the wire melting phenomena in oscillation laser welding differed from those of straight (nonoscillation) laser welding. Additionally, narrow-gap laser welding experiments were performed to investigate the relationship between the oscillation conditions and gap width. The results confirmed the effectiveness of oscillation laser welding for narrow-gap welding.

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“…The test showed that these NGLW welds have a lower residual stress than tungsten inert gas (TIG) welded joint. Tsukamoto [ 9 ] joined 60 mm thick SA-516 low carbon steel by multi pass NGLW with 10 kW fiber laser. He found that 60 mm thick plate could be fulfilled by 10 passes, but lack of fusion also occurred due to the low heat input.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel

Zhang

Gao

et al. 2017

Materials

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Both laser-arc hybrid welding and narrow gap welding have potential for the fabrication of thick sections, but their combination has been seldom studied. In this research, 40 mm thick mild steel was welded by narrow gap laser-arc hybrid welding. A weld with smooth layer transition, free of visible defects, was obtained by nine passes at a 6 mm width narrow gap. The lower part of the weld has the lowest mechanical properties because of the lowest amount of acicular ferrite, but its ultimate tensile strength and impact absorbing energy is still 49% and 60% higher than those of base metal, respectively. The microhardness deviation of all filler layers along weld thickness direction is no more than 15 HV0.2, indicating that no temper softening appeared during multiple heat cycles. The results provide an alternative technique for improving the efficiency and quality of welding thick sections.

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Laser narrow gap welding of thick carbon steels using high brightness laser with beam oscillation

Cited by 18 publications

References 3 publications

Wire deposition by a laser-induced boiling front

Wire deposition by a laser-induced boiling front

Fundamental study of narrow-gap welding with oscillation laser beam

Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel

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