Pulsed Laser Welding

Chmelíčková, Hana; Šebestová, Hana

doi:10.5772/36414

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…It has been reported in the literature that the pulse overlap reduces with an increase in the welding speed, at a constant pulse frequency owing to the relatively low heat input. 30,42 In this study, only the average power was varied from 360 W to 440 W, while the welding speed, frequency and pulse width were kept constant, as presented in Table 2. The dimensions of the spots ( S ′ and S ) are shown in Figure 2 (f), which were used to calculate the pulse overlap using equation (1) and it can be concluded that with the increase in average power from 360 W to 440 W, pulse overlap increased from ∼54% to ∼72% as shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Influence of pulsed Nd:YAG laser welding power on the microstructures and nano creep behaviour of Ti5Al2.5Sn beads

Asif

Khan

Shehbaz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Pulsed Nd:YAG laser beam welding was performed at five different power levels (360 W, 380 W, 400 W, 420 W and 440 W), and the relationship between microstructure and nano creep behaviour was investigated for Ti5Al2.5Sn alloy. Microstructural analysis indicated a reduction in grain size in fusion zone, with an increase in the average laser power. In the fusion zone (FZ) of all the beads, acicular α and ά martensite were observed and confirmed by SEM analysis. Due to the formation of the α and ά phases during welding, the microhardness and nanohardness in the FZ increased by ∼71% and ∼58%, respectively, above that of the base alloy. Nano creep analysis suggested diffusional creep as the deformation mechanism in all the beads, except the one performed at an average power of 440 W since its stress exponent was less than 2.

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Section: Resultsmentioning

confidence: 99%

Influence of pulsed Nd:YAG laser welding power on the microstructures and nano creep behaviour of Ti5Al2.5Sn beads

Asif

Khan

Shehbaz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…For a given spot size, interaction on the surface material also known as PPD can be calculated using the equation in Eq. 1 [24]. Barea resembles the laser beam spot area in this equation.…”

Section: High Power Diode Lasermentioning

confidence: 99%

“…The upper layer of the metal absorbs partially of the radiation which causes it to raise its melting point [23]. LBW's main process parameters are laser beam properties such as peak power, beam quality, and diameter, laser wavelength radiated, focal length, welding conditions such as focus to the material surface, workpiece movement to the laser spot, weld type, processing gas, and physical properties of welded material [24]. Parameters and combinations in LBW where the heat input is determined should be selected correctly for superb weld quality [25].…”

Section: Laser Weldingmentioning

confidence: 99%

An Overview of Laser Welding of High Strength Steels for Automotive Application

Manoharan¹,

Quazi²,

Bashir³

et al. 2020

Int. j. technol. eng. stud.

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The current study investigates the effect of processing parameters Advance High Strength Stainless steel (AHSS) in terms of weld geometry by using the Pulse Wave (PW) mode of the fibre laser. The mechanical characteristics and microstructure are discussed and studied based on the literature. This study conducted an extensive literature review and highlighted various types of steel important for automotive applications. After that, laser welding of steel and the corresponding effect of parameters and their effect on weld geometry are discussed. It can be concluded that the variation of laser welding parameters can cause high thermal distortion and greatly affect the joint's mechanical performance. Hence, an optimum parameter value should be investigated to obtain a strong joint. This study also highlighted several avenues that researchers in future must explore.

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