Laser welding of ultra-high strength steel with different oscillating modes

Chen, Cong; Zhou, Haipeng; Wang, Changjian; Liu, Lili; Zhang, Yuhui; Zhang, Ke

doi:10.1016/j.jmapro.2021.06.004

Cited by 38 publications

(4 citation statements)

References 22 publications

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“…A refinement of the grain size through the use of a superimposed oscillation of the laser beam corresponds to the findings for the laser welding of high-strength steel. [32] At the time the microstructure was analyzed, however, the grain sizes could not be determined quantitatively due to sample preparation or image evaluation difficulties.…”

Section: ½2mentioning

confidence: 99%

“…So far, the effect of the superposition of an oscillating movement of the laser beam transverse to the welding direction has not been investigated for laser welding of Ni-Ti materials to the knowledge of the authors. For the laser welding of high-strength steel Chen et al [32] found that the laser beam oscillation was beneficial to improve the microstructure compared to welding without oscillation. The latter led to mainly coarse columnar grains while superimposed oscillation resulted in refined columnar grains with equiaxed grains in the weld center and higher tensile strengths of the weld.…”

Section: Introductionmentioning

confidence: 99%

“…The latter led to mainly coarse columnar grains while superimposed oscillation resulted in refined columnar grains with equiaxed grains in the weld center and higher tensile strengths of the weld. [32] The effect of a S-curve laser power for power distribution control on laser oscillating welding of an aluminum alloy was investigated by Tan et al [33] With this strategy, a refined grain structure, a narrowed columnar region, and improved mechanical properties of the joints were achieved, with the S-curve power providing higher tensile strengths compared to the process with constant power. [33] Wang et al [34] observed that an oscillation increases the stirring effect of the molten metal pool and found that oscillation mitigates macrosegregation of the weld for the laser-arc hybrid welding of aluminum.…”

Section: Introductionmentioning

confidence: 99%

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Laser Welding of Nitinol Thin Foils: Mechanical Properties and Microstructure Depending on Process Parameters

Katrakova-Krüger

Pegoraro

Salmaso

et al. 2023

Metall Mater Trans A

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Ni–Ti alloys are used as functional materials in numerous sectors such as aerospace, automotive engineering, medical technology, and consumer goods. Their properties in terms of shape memory effect and superelasticity offer a great potential for innovative smart products. However, forming and machining of these alloys into concrete products is challenging. Assembling plain structures by laser welding to complex product shapes offers an economical alternative in many cases, but can be associated with negative effects, such as reduction of strength, development of brittle intermetallic compounds, alteration of transformation temperatures, and modification of shape memory effects and superelastic behavior. Against this background, investigations on laser welding of Ni55/Ti45 foil with a thickness of 125 µm by a fiber laser were conducted. Supported by methods of design of experiments, optimal parameters were determined with respect to laser power, welding speed, focus position, and beam oscillation, and the welding results were analyzed concerning the microstructure and mechanical characteristics of the welded joints. The effect of laser beam oscillation was investigated for the first time for the welding of this alloy. Due to the very low thickness, the preparation of the foils for the microstructure characterization is quite demanding. Best results were obtained by ion milling. Fracture surfaces and the influence of the welding were also investigated.

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Section: ½2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser Welding of Nitinol Thin Foils: Mechanical Properties and Microstructure Depending on Process Parameters

Katrakova-Krüger

Pegoraro

Salmaso

et al. 2023

Metall Mater Trans A

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“…In addition to the above studies, many scholars also applied vibration directly to the arc to achieve the so-called laser oscillation welding, which produced good welding effects [12,13]. The different properties of a weld can be improved by using the laser beams in different oscillation modes to stir the weld pool.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Ultrasonic Power on the Properties of RHA Steel Welded Joints

Yin

Pan

et al. 2022

Materials

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Based on the changes of microhardness, tensile strength, and impact resistance caused by the difference of macroscopic morphology and microstructure of welded joints, this paper studied the effect of different ultrasonic power on the properties of welded joints during the welding of homogeneous armor steel. It is experimentally found that the macroscopic morphology of those joints is very different. Compared with conventional welding, ultrasonic welding can increase the weld depth and the width of the heat-affected zone (HAZ) on either side of the weld. However, only the ultrasonic wave at an appropriate power level can increase the weld width. In addition, appropriate ultrasonic power can significantly improve the grain state of the weld. With the increase of ultrasonic power, the grain size in HAZ will decrease. The microhardness of the weld will first increase and then decrease, while the microhardness of the HAZ will increase. This is basically consistent with the changing trend of impact resistance. An ultrasonic wave can also increase the tensile strength of a welded joint up to 802 MPa, 12.4% higher than that in conventional welding. However, a high-power ultrasonic wave will bring down the tensile strength. This study provides guidance for the selection of ultrasonic-assisted regulation power to achieve the different properties of homogeneous armor steel joints.

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