Dual beam method for laser welding of galvanized steel: Experimentation and prospects

Iqbal, S.; Gualini, M. M. S.; Rehman, Ateeq Ur

doi:10.1016/j.optlastec.2009.05.009

Cited by 49 publications

(16 citation statements)

References 8 publications

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“…It should also be noted that the high welding rates (very low linear energy) can trigger disadvantageous phenomena during the crystallisation of a weld, e.g. cracks or excessive hardness in a weld or in the HAZ [16].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Aspects of Twin-Spot Laser Welding of Dp-Hsla Steel Sheet Joints

Stano

Grajcar²,

Wilk³

et al. 2016

Archives of Metallurgy and Materials

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The article presents the possibility of using twin-spot laser welding (i.e. laser welding with focusing a laser beam on two spots) for making overlap joints made of 0.8-1 mm thick HSLA and DP type high strength steel sheets. joints were made using a Yb:YAG disc laser having a maximum power of 12 kW and a welding head by means of which it was possible to focus a laser beam on two spots, 0.6 mm and 1 mm away. The angle between focuses amounted to 0° or 90°, whereas the power distribution was 50%-50%. With settings as presented above it was possible to obtain high-quality overlap joints. The geometrical parameters of the joints were primarily affected by beams positions (in relation to each other) and, to a lesser degree, by the distance between the focuses. It was possible to obtain a 10% hardness reduction in the fusion zone of the DP-HSLA steel joints if the angle between the beams amounted to 90°. The tests also involved microstructural examinations of individual zones of the joints.

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Section: Introductionmentioning

confidence: 99%

Microstructural Aspects of Twin-Spot Laser Welding of Dp-Hsla Steel Sheet Joints

Stano

Grajcar²,

Wilk³

et al. 2016

Archives of Metallurgy and Materials

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“…Sheets of this type are used in the manufacture of automobile bodies in high volume production because of excellent corrosion resistance and relatively low costs [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The basic, conventional and used for many years method of joining of the car body parts is a resistance spot welding (RSW) [7][8][9][10][11][12]. In the case of car body parts with larger thicknesses, also the method of gas metal arc welding (GMAW or MIG/MAG) is used.…”

Section: Introductionmentioning

confidence: 99%

“…J. Milberg and A. Trautmann produced defect-free overlap joints of galvanized steel using bifocal hybrid laser welding by combining an Nd:YAG laser with a high power diode laser [8,[18][19][20][21][22][23][24][25]. S. Iqbal et al elaborated the novel method of dual beam laser welding [9]. In this method the precursor beam cuts a slot, thus making an exit path for the zinc vapours, while the second beam performs the needed welding.…”

Section: Introductionmentioning

confidence: 99%

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Disk Laser Welding of Car Body Zinc Coated Steel Sheets / Spawanie Laserem Dyskowym Blach Ze Stali Karoseryjnej Ocynkowanej

Lisiecki¹,

Burdzik²,

Siwiec³

et al. 2015

Archives of Metallurgy and Materials

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Autogenous laser welding of 0.8 mm thick butt joints of car body electro-galvanized steel sheet DC04 was investigated. The Yb:YAG disk laser TruDisk 3302 with the beam spot diameter of 200 µm was used. The effect of laser welding parameters and technological conditions on weld shape, penetration depth, process stability, microstructure and mechanical performance was determined. It was found that the laser beam spot focused on the top surface of a butt joint tends to pass through the gap, especially in the low range of heat input and high welding speed. All test welds were welded at a keyhole mode, and the weld metal was free of porosity. Thus, the keyhole laser welding of zinc coated steel sheets in butt configuration provides excellent conditions to escape for zinc vapours, with no risk of porosity. Microstructure, microhardness and mechanical performance of the butt joints depend on laser welding conditions thus cooling rate and cooling times. The shortest cooling time t8/5 was calculated for 0.29 s.Keywords: car body steel, DC04, laser welding, disk laser, zinc W artykule opisano wyniki badań procesu spawania laserowego bez materiału dodatkowego złączy doczołowych blach karoseryjnych ocynkowanych DC04 o grubości 0.8 mm. W procesie spawania zastosowano laser stały Yb:YAG TruDisk 3302 z wiązką laserową o średnicy ogniska 200 µm. Badano wpływ parametrów i warunków technologicznych spawania na kształt i głębokość ściegu spoiny, stabilność procesu spawania, mikrostrukturę i właściwości mechaniczne złączy. Stwierdzono, że wiązka laserowa zogniskowana na górnej powierzchni blach wykazuje tendencję do przenikania przez szczelinę złącza, szczególnie przy niskich energiach liniowych i dużych prędkościach spawania. W całym zakresie parametrów złącza były spawane z utworzeniem kanału parowego, a metal spoiny był wolny od porowatości. Wskazuje to, że konfiguracja złącza doczołowego stwarza dogodne warunki do ujścia par cynku, bez ryzyka porowatości spoin. Mikrostruktura, mikrotwardość i właściwości mechaniczne złączy zależą wyraźnie od warunków spawania, a więc szybkości stygnięcia i czasów stygnięcia. Najkrótszy wyznaczony czas stygnięcia t8/5 był równy 0.29 s.

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“…Loredo et al (2002) added a second laser heat source and Xie and Denney (2001) split the laser beam into two laser beams for the welding of galvanized steel. Iqbal et al (2010) used a precursor beam to cut a slot along the joint line for welding of galvanized steel. Gu and Mueller (2001) applied gas tungsten arc welding (GTAW) as an auxiliary preheating source to laser welding of galvanized steel.…”

Section: Introductionmentioning

confidence: 99%

Two-pass laser welding of galvanized high-strength dual-phase steel for a zero-gap lap joint configuration

Kong

Carlson

et al. 2013

Journal of Materials Processing Technology

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Dual beam method for laser welding of galvanized steel: Experimentation and prospects

Cited by 49 publications

References 8 publications

Microstructural Aspects of Twin-Spot Laser Welding of Dp-Hsla Steel Sheet Joints

Microstructural Aspects of Twin-Spot Laser Welding of Dp-Hsla Steel Sheet Joints

Disk Laser Welding of Car Body Zinc Coated Steel Sheets / Spawanie Laserem Dyskowym Blach Ze Stali Karoseryjnej Ocynkowanej

Two-pass laser welding of galvanized high-strength dual-phase steel for a zero-gap lap joint configuration

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