Effect of the laser power on the mechanical performance of the laser spot welds in dual phase steels

Kundu, Janardan; Ray, Trishita; Kundu, Atanu; Shome, Mahadev

doi:10.1016/j.jmatprotec.2018.12.014

Cited by 26 publications

(6 citation statements)

References 24 publications

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“…The welded joints are mainly composed of NZ, fusion zone (FZ), heat affected zone (HAZ), and BM. According to the different peak temperatures, the HAZ can be divided into four sub-zones, which are subcritical HAZ (SCHAZ), intercritical HAZ (ICHAZ), fine-grained HAZ (FGHAZ), and coarse-grained HAZ (CGHAZ), whose peak temperatures approximately are <A c1 , A c1 ~A c3 , >A c3 and >>A c3 , respectively [ 18 ]. Compared with the SMAW joint, the narrower width of the HAZ in the FSW joints was ascribed to the fact that FSW was solid-phase welding with low heat input.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Toughness and Ductility of Friction Stir Welded SA516 Gr.70 Steel Joint via Post-Welding Annealing

Wang,

Miao,

Gong

et al. 2023

Materials

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The SA516 Gr.70 steel possessing excellent toughness and plasticity has been widely used in the cryogenic field. However, the appearance of coarse bainite in the heat affected zone (HAZ) of the fusion welded joint deteriorates the toughness and ductility. In this work, 4.5 mm thick SA516 Gr.70 steel was joined using shielded metal arc welding (SMAW) and friction stir welding (FSW), respectively, and the microstructure and mechanical properties of joints were investigated in detail. The Charpy energy in the HAZ in the FSW joint was 80 J/cm2, which was higher than that of the HAZ in the SMAW joint (60 J/cm2) and due to microstructure refinement. In addition, the total elongation (TE) of the SMAW joint was 17.5%, which was higher than that of the FSW joint (12.1%) and caused by a wider nugget zone with high hardness. The post-welding annealing was used to improve the toughness and ductility of the SMAW and FSW joints, and the microstructure and mechanical properties of the joints after annealing were analyzed. The toughness in the HAZ of the SMAW and FSW joints were 80 and 103 J/cm2, and the TE of the SMAW and FSW joints were 18.6% and 25.2%, respectively. Finally, the as-annealed FSW joints exhibited excellent toughness and ductility. The abovementioned excellent mechanical properties were primarily attributed to the appearance of tempering martensite, decrease in dislocation density, and fine grain.

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Section: Resultsmentioning

confidence: 99%

Enhanced Toughness and Ductility of Friction Stir Welded SA516 Gr.70 Steel Joint via Post-Welding Annealing

Wang,

Miao,

Gong

et al. 2023

Materials

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“…Although higher fatigue strength was reported in the DP steel with increasing martensite content [ 29 , 30 , 31 ], lower fatigue strength of DP1000/1.3-DP1000/1.3 weldment than DP800/1.3-DP800/1.3 weldment was found in this work, which could be a result of different surface defects as oxide particles appearing on the weld surface. In addition, the weld concavity can initiate formation of fatigue cracks [ 32 , 33 ]. The lower fatigue strength of DP800/2.1-DP800/2.1 weldment compared with DP800/1.3-DP800/1.3 weldment can be related to the presence of the weld concavity.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Laser-Welded DP Steels Used in the Automotive Industry

Forouzan

Volpp

et al. 2021

Materials

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The aim of this work was to investigate the microstructure and the mechanical properties of laser-welded joints combined of Dual Phase DP800 and DP1000 high strength thin steel sheets. Microstructural and hardness measurements as well as tensile and fatigue tests have been carried out. The welded joints (WJ) comprised of similar/dissimilar steels with similar/dissimilar thickness were consisted of different zones and exhibited similar microstructural characteristics. The trend of microhardness for all WJs was consistent, characterized by the highest value at hardening zone (HZ) and lowest at softening zone (SZ). The degree of softening was 20 and 8% for the DP1000 and DP800 WJ, respectively, and the size of SZ was wider in the WJ combinations of DP1000 than DP800. The tensile test fractures were located at the base material (BM) for all DP800 weldments, while the fractures occurred at the fusion zone (FZ) for the weldments with DP1000 and those with dissimilar sheet thicknesses. The DP800-DP1000 weldment presented similar yield strength (YS, 747 MPa) and ultimate tensile strength (UTS, 858 MPa) values but lower elongation (EI, 5.1%) in comparison with the DP800-DP800 weldment (YS 701 MPa, UTS 868 MPa, EI 7.9%), which showed similar strength properties as the BM of DP800. However, the EI of DP1000-DP1000 weldment was 1.9%, much lower in comparison with the BM of DP1000. The DP800-DP1000 weldment with dissimilar thicknesses showed the highest YS (955 MPa) and UTS (1075 MPa) values compared with the other weldments, but with the lowest EI (1.2%). The fatigue fractures occurred at the WJ for all types of weldments. The DP800-DP800 weldment had the highest fatigue limit (348 MPa) and DP800-DP1000 with dissimilar thicknesses had the lowest fatigue limit (<200 MPa). The fatigue crack initiated from the weld surface.

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“…Welding is the most preferred combining process in automotive industry. In general, there are several welding methods in the automotive industries, for example, ultrasonic spot welding, 9 friction stir spot welding (FSSW), 10 pinless FSSW, 11 laser spot welding, 12 and resistance spot welding (RSW). 13 RSW is the most preferred welding method for performing these combinations.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of different welding parameters on tensile properties and failure modes of non-alloyed steel produced by powder metallurgy

Elitaş

Erden

2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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Resistance spot welding was implemented to unalloyed steel produced by powder metallurgy method at different welding parameters in this study. Other welding parameters are constant, but electrode force values are 0.21–0.28–0.35 kN and welding current values are 9–10–11 kA. The effects of different welding parameters on microhardness, nugget diameter, tensile shear force, and failure mode were investigated. Consequently, the tensile shear force increased as welding current and electrode force up to a certain value increased. When critical electrode force value was exceeded, tensile shear force decreased, although nugget diameter increased. Compared to the base material, a decrease in tensile shear force has occurred in resistance spot welded joints. Except for values higher than the critical electrode force value, a linear relationship was determined between the nugget diameter, tensile shear force, and microhardness. Two different failure modes were observed, namely sheet transverse failure and partial interfacial failure.

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Effect of the laser power on the mechanical performance of the laser spot welds in dual phase steels

Cited by 26 publications

References 24 publications

Enhanced Toughness and Ductility of Friction Stir Welded SA516 Gr.70 Steel Joint via Post-Welding Annealing

Enhanced Toughness and Ductility of Friction Stir Welded SA516 Gr.70 Steel Joint via Post-Welding Annealing

Microstructure and Mechanical Properties of Laser-Welded DP Steels Used in the Automotive Industry

Investigation of the effect of different welding parameters on tensile properties and failure modes of non-alloyed steel produced by powder metallurgy

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