Research On Laser-Arc Hybrid Welding Of Ht780 Steel

Suga, Tetsuo; Murai, Yasuo; Kobashi, Taizo; Ueyama, Tomoyuki; Era, Tetsuo; Ueda, Y.; Sato, M.; Hara, Noriyuki

doi:10.1007/bf03321401

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…Many researchers concentrated on the influence either of geometric parameters, such as the distance of the laser beam to the arc 3,4) , root gap 2,5) and the laser beam focal position 2,5,6) . Many researches on defocused distance evaluate penetration depth by hybrid welding on bead on plate 2,6,7) . However, these studies did not consider the effects of square-groove gaps, so the effects of defocused distance on backside bead formation were not reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of focal position on laser-MAG arc hybrid weld bead of thick high-strength steel plate

Ishida

Tashiro

Mizutani

et al. 2020

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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Section: Introductionmentioning

confidence: 99%

Effect of focal position on laser-MAG arc hybrid weld bead of thick high-strength steel plate

Ishida

Tashiro

Mizutani

et al. 2020

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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“…Especially welding at the Igroove as it is cut with a laser can reduce the cost of groove processing. To solve the contradiction between quality and efficiency in the welding of high-strength steel plate, some new welding methods such as laser-arc hybrid welding [1][2][3] have been used. However, the equipment cost of the laser-arc hybrid welding is high.…”

Section: Introductionmentioning

confidence: 99%

Study on the weld bead formation on square-groove butt joint using plasma-MIG hybrid welding process

Ishida

Tashiro

Mizutani

et al. 2020

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY

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The welding with hybrid heat sources combined a plasma arc and a metal inert gas (MIG) arc was performed on the I-groove joint of 9 mm thick high-strength steel plates. The plasma torch is set up in the leading position, while the MIG torch is set up in the trailing position. As a result of observing hybrid welding with a high-speed camera, the plasma arc and the MIG arc are repelled each other. The influence of the root gap on the cross section and the bead formation was investigated. As a result, defect-free beads were formed at the root gap of 1.5 mm.

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Effect of oxygen in shielding gas on weldability in plasma-GMA hybrid welding process of high-tensile strength steel

Trinh,

Tashiro,

Suga

et al. 2024

Int J Adv Manuf Technol

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This study aims to clarify the effect of oxygen in shielding gas on weldability in the plasma-GMA (Gas Metal Arc) hybrid welding process of high-tensile strength steel plates. The difference in keyhole profile and bead formation, when the GMA shielding gas was pure Ar, Ar + 2% O2, or Ar + 20% CO2, was investigated for plate thicknesses of 6 and 9 mm for the first time. It was found that the weld beads were in good condition for 6 mm thickness plates for all shielding gases, which implied that the window of welding conditions for this thickness is wide. In contrast, for 9 mm thickness plates, a fully penetrated weld bead was achieved only in Ar + 20% CO2, and weld bead penetration in Ar + 20% CO2 is higher than in pure Ar and Ar + 2% O2 in the same welding condition. Due to decreased surface tension caused by sufficiently increased oxygen absorbed into the weld pool, the keyhole diameter increased to penetrate the bottom side of the plate, and the depressing weld pool surface under GMA allowed the heat input from the GMA to be directly applied to a deeper position. Consequently, the plasma-GMA hybrid welding process with Ar + 20% CO2 achieved a complete penetration for a plate of 9 mm thickness, owing to the effects of both phenomena. It proved a potential to increase penetrability in welding thicker plates by controlling oxygen content in shielding gas of GMA adequately.

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Research On Laser-Arc Hybrid Welding Of Ht780 Steel

Cited by 9 publications

References 14 publications

Effect of focal position on laser-MAG arc hybrid weld bead of thick high-strength steel plate

Effect of focal position on laser-MAG arc hybrid weld bead of thick high-strength steel plate

Study on the weld bead formation on square-groove butt joint using plasma-MIG hybrid welding process

Effect of oxygen in shielding gas on weldability in plasma-GMA hybrid welding process of high-tensile strength steel

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