Laser Dissimilar Welding of AISI 430F and AISI 304 Stainless Steels

Pańcikiewicz, Krzysztof; Świerczyńska, Aleksandra; Hućko, Paulina; Tumidajewicz, M.

doi:10.3390/ma13204540

Cited by 57 publications

(38 citation statements)

References 36 publications

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“…5a). These effects are consistent with the observations of Kadoi [40]. In the heat affected zone, unlike the base material, no slip-bands are observed, and the number of twin-crystals is much smaller.…”

Section: Examination Of Test Jointssupporting

confidence: 91%

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Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Janiczak

Pańcikiewicz

2021

Weld World

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The production of a ferrofluid container, intended for use in the KRAKsat (CubeSat type) satellite in space conditions, is presented. Mechanized laser beam welding for AISI 316L stainless steel test joint and container prototype was developed and tested. The welded test joints were examined by non-destructive visual, penetration and radiographic testing and destructive testing by macro- and microscopic examination, static tensile test, static bending test, and hardness measurements. The welded container prototype was examined by leak test, temperature-vacuum test and vibration test. Test joints’ evaluation showed a proper selection of welding parameters and expected quality of joints. Austenitic microstructure with small δ-ferrite content in base materials, heat-affected zones, and welds guarantees sufficient mechanical properties for this part geometry. The tensile strength range of test joints was 687–729 MPa, hardness range was 140–200 HV3, and the bending angle was 180°. Welding of the prototype container and testing of tightness, resistance to temperature changes, and vibration were successful. Compliance with flywheel design and manufacturing requirements will enable the launch of a research satellite into orbit with such a wheel.

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Section: Examination Of Test Jointssupporting

confidence: 91%

“…5b (to the right). Observations showed the presence of equiaxed, twin-crystal structure austenite grains with locally visible slip-bands, described, e.g., by Hernández-Trujillo et al [39] and Pańcikiewicz et al [40]. The very small heataffected zone is characteristic for laser beam welding.…”

Section: Examination Of Test Jointsmentioning

confidence: 72%

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Janiczak

Pańcikiewicz

2021

Weld World

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“…Starting from the historical works of Schaeffler and DeLong, David et al [8] investigated the effects of cooling rate, Siewert et al [9] proposed a new ferrite diagram (WRC 1988) that shows, in the austenite/ferrite zone, the ferrite percentages, or ferrite number (FN); then the diagram was modified by Kotecki and Siewert [10] by the inclusion of the solidification mode boundaries (WRC 1992), obtaining a very useful tool to predict weld microstructure on the base of the grade of dilution. This kind of diagram is still attractive for phase evaluations based on the fused zone composition, especially in the case of dissimilar welds [11,12]. Other than composition, cooling rate [13] is a non-negligible parameter in determining the solidification modalities, which in turn results from the welding conditions.…”

Section: Introductionmentioning

confidence: 99%

Weld Metal Microstructure Prediction in Laser Beam Welding of Austenitic Stainless Steel

Giudice

Sili

2021

Applied Sciences

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In the present work an approach to weld metal microstructure prediction is proposed, based on an analytical method that allows the evaluation of the thermal fields generated during the laser beam travel on thick plates. Reference is made to AISI 304L austenitic steel as a base material, with the aim to predict the molten zone microstructure and verify the best condition to avoid hot cracking formation, which is a typical issue in austenitic steel welding. The “keyhole” full penetration welding mode, characteristic of high-power laser beam, was simulated considering the phenomenological laws of conduction by the superimposition of a line thermal source along the whole thickness and two point sources located, respectively, on the surface and at the position of the beam focus inside the joint. This model was fitted on the basis of the fusion zone profile, which was experimentally detected on a weld seam obtained by means of a CO2 laser beam, in a single pass on two squared edged AISI 304L plates, that were butt-positioned. Then the model was applied to evaluate the thermal fields and cooling rates, the fusion zone composition and the solidification mode.

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“…The appearance of the new phases produces the differences between the base material (BM) and the joint, which can significantly affect the overall properties of the welded material, e.g., poor mechanical strength and fatigue [ 8 , 9 ]. Additional challenges may occur when welding the dissimilar materials because of the different physical and chemical properties of the BMs, such as thermal expansion coefficients, melting points, and mechanical properties, as well as the formation of intermetallic compounds [ 10 , 11 , 12 ]. The thermal cycles of welding processes cause changes in the microstructures of DP steels, leading to the formation of a fusion zone (FZ) and a heat-affected zone (HAZ) in the welded joint (WJ).…”

Section: Introductionmentioning

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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Laser Dissimilar Welding of AISI 430F and AISI 304 Stainless Steels

Cited by 57 publications

References 36 publications

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Laser welding of austenitic ferrofluid container for the KRAKsat satellite

Weld Metal Microstructure Prediction in Laser Beam Welding of Austenitic Stainless Steel

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

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