Research on laser welding of vehicle body

Wu, Qiang; Gong, Jinke; Chen, Genyu; Xu, Liang

doi:10.1016/j.optlastec.2007.06.004

Cited by 61 publications

(25 citation statements)

References 2 publications

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“…The sheets can exhibit different mechanical properties, thickness or coatings. DOI In series production the joining of the blanks is usually done by laser welding though other weld techniques are also possible [7][8][9][10]. Using tailor welded blanks enable an adaptation to locally different loading conditions or other requirements in the part.…”

Section: Introductionmentioning

confidence: 99%

Fibre Laser Welding of Dual Phase Steels

Švec¹,

Schrek²,

Hrnčiar³

et al. 2015

Acta Metall Slovaca

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The fibre laser welding of two different dual phase steels HCT980X and HCT600X was evaluated. The sheets with thickness of 1.2 mm were welded using the solid-state fibre laser IPG type YLR 4500 with maximum output 4.5 kW and wave length 1060 nm at graduated beam powers and welding speeds. The microstructure of welded samples was analysed, microhardness and tensile strength were measured. The heat input influenced the microstructure of the fusion zone and heat affected zone. The microhardness increased in the fusion zone and even more in the heat affected zone of HCT980X steel, which was the consequence of martensite and bainite formation in these areas. The tensile strength of joints achieved the strength of the HCT600X steel and all joints fractured in the HCT600X base metal.Keywords: dual phase steels, fibre laser welding, microstructure, microhardness, tensile strength IntroductionDual phase (DP) steels, which are the important part of advanced high strength steels, have been used in manufacture of lightweight automobiles to reduce fuel consumption without compromising other attributes such as safety, performance, recyclability and cost. Some of the major advantages of the dual phase steels include their superior mechanical properties in comparison with standard steels, moderate price thanks to small amount of alloying additions, as well as excellent technological properties, together with good weldability and machinability [1][2][3][4]. The excellent mechanical properties are the consequence of their multiphase structure. Microstructure of DP steel consists of 30-70 % martensite in the fine-grained, spherical ferrite matrix and 1-10 % of metastable retained austenite. As a result, the steel is characterised by high tensile strength up to 1180 MPa with unit elongation up to 27 %. Most often the microstructure of DP steel is developed as a result of accelerated cooling of thin sheets after cold rolling in the range between Ac1 and Ac3 and controlled air-water mist cooling to ambient temperature. The process is flexible one and allows for different combinations of relative volume ratio of ferrite and martensite. The dual phase steels are used in automotive industry for frames and crossbeams, vertical beams, side impact beams, and safety elements [4][5][6]. Dual phase steels have been used for producing of tailor welded blanks. Tailor welded blanks are semi-finished parts that consist of at least two single sheets that are welded together prior the forming process. The sheets can exhibit different mechanical properties, thickness or coatings.

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Section: Introductionmentioning

confidence: 99%

Fibre Laser Welding of Dual Phase Steels

Švec¹,

Schrek²,

Hrnčiar³

et al. 2015

Acta Metall Slovaca

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“…For example, Benyounis et al [2] identified the importance of laser power, focal position, and welding speed on the assembly joint's quality such as heat input and weld bead geometry (i.e., penetration depth, widths of welded zone, and heat-affected zone). Wu et al [3] also confirmed that there is a statistically significant correlation between a joint's quality (i.e., welding penetration and the width of a weld seam) and laser power and welding speed.…”

Section: Introductionmentioning

confidence: 90%

“…Benyounis et al [2], Wu et al [3] Part-to-part gap Weld depth, weld width, and concavity Zhao et al [9] Laser power, welding speed, focal position, and shielding gases Static tensile strength Mei et al [10] Shielding gases Tensile strength and widths of heat-affected zone Chen et al [11], Yang et al [12] Clamp pressure Lap shear strength and weld seam width Acherjee et al [13], Anawa et al [14] What makes laser welding more complex is that part-to-part gaps are very often non-uniform, as shown in Figure 1. Owing to the non-uniformity, elevation and depression angles always exist throughout the gap, creating ascending, descending, and flat travelling paths for laser welding from the perspective of the direction of the laser beam.…”

Section: Major Process Parameters Laser Welding Quality Referencesmentioning

confidence: 99%

The Effects of Laser Welding Direction on Joint Quality for Non-Uniform Part-to-Part Gaps

Kim

Ceglarek

2016

Metals

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Abstract:Controlling part-to-part gaps is a crucial task in the laser welding of galvanized steel sheets for ensuring the quality of the assembly joint. However, part-to-part gaps are frequently non-uniform. Hence, elevations and depressions from the perspective of the heading direction of the laser beam always exist throughout the gap, creating ascending, descending, and flat travelling paths for laser welding. In this study, assuming non-uniform part-to-part gaps, the effects of welding direction on the quality of the joint of galvanized steel sheets-SGARC440 (lower part) and SGAFC590DP (upper part)-were examined using 2-kW fiber and 6.6-kW disk laser welding systems. The experimental analysis of coupon tests confirmed that there is no statistically significant correlation between the direction of welding and weld pool quality if the gap exceeds the tolerable range. However, when the gap is controlled within the tolerable range, the welding direction can be considered as an important process control variable to enhance the quality of the joint.

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“…Laser is preferred for welding, owing to to the high speed of the process, low distortion due to the small heat affected zone, manufacturing flexibility and ease of automation [3][4][5]. Further improvements in transportation can be achieved by replacing steel with lighter metals such as aluminum and its alloys [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

Popescu

Delval

Leparoux

2017

Metals

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Abstract:We report on a feedback mechanism for rapid identification of optimal laser parameters during welding of AlMg5 coupons using real-time monitoring by high-speed imaging. The purpose was to constrain the liquid movement in the groove in order to obtain pore-free welds in this otherwise difficult-to-weld alloy. High-speed imaging of the welding process via an optical microscope allowed for recording at millimeter level, providing new information on liquid-metal dynamics during laser irradiation as well as plausible explanations for spatter occurrence and pores formation. The pore formation and especially the position of these pores had to be controlled in order to weld 3 mm thick samples. By tuning both laser power and pulse duration, pores were aligned on a single line, at the bottom of the weld. A laser pass of reduced power on that side was then sufficient for removing all pores and providing a suitable weld.

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Research on laser welding of vehicle body

Cited by 61 publications

References 2 publications

Fibre Laser Welding of Dual Phase Steels

Fibre Laser Welding of Dual Phase Steels

The Effects of Laser Welding Direction on Joint Quality for Non-Uniform Part-to-Part Gaps

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

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