Nanosecond pulsed laser welding of high carbon steels

Ascari, Alessandro; Fortunato, Alessandro

doi:10.1016/j.optlastec.2013.07.016

Cited by 20 publications

(6 citation statements)

References 25 publications

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“…Presently, high-carbon steels are mainly welded by friction welding [ 22 , 23 ], friction stir welding [ 19 , 24 , 25 , 26 ], or laser welding [ 27 ]. Arc welding is not applied for this purpose because of the cracking of the welded joints.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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The purpose of the research was to obtain an arc welded joint of a preliminary quenched high-carbon wear resistant steel without losing the structure that is previously obtained by heat treatment. 120Mn3Si2 steel was chosen for experiments due to its good resistance to mechanical wear. The fast cooling of welding joints in water was carried out right after welding. The major conclusion is that the soft austenitic layer appears in the vicinity of the fusion line as a result of the fast cooling of the welding joint. The microstructure of the heat affected zone of quenched 120Mn3Si2 steel after welding with rapid cooling in water consists of several subzones. The first one is a purely austenitic subzone, followed by austenite + martensite microstructure, and finally, an almost fully martensitic subzone. The rest of the heat affected zone is tempered material that is heated during welding below A1 critical temperature. ISO 4136 tensile tests were carried out for the welded joints of 120Mn3Si2 steel and 09Mn2Si low carbon steel (ASTM A516, DIN13Mn6 equivalent) after welding with fast cooling in water. The tests showed that welded joints are stronger than the quenched 120Mn3Si2 steel itself. The results of work can be used in industries where the severe mechanical wear of machine parts is a challenge.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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“…In advance, PW mode can also be applied by using low power laser source to achieve similar penetration of several kilowatts of CW mode laser power. The study of PW welding mode by using low power Fibre laser has been conducted by Ascari and Fortunato [37]. Similar to the finding from Tadamalle et al [36], the high PP and PPD values led to the ablation phenomena and ejection of molten metal from the molten pool.…”

Section: Introductionmentioning

confidence: 67%

The effect of pulse welding parameters on weld geometry of boron steel using low power fibre laser

Yaakob¹,

Ishak²,

Idris³

2017

J. MECH. ENG. SCI.

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Demands of tailored weld blank application on press hardened materials such as boron steel have given interest in the process parameter study of laser welding. The pulse wave mode of laser welding produces high peak power, replacing the continuous wave mode which could lead to wider applications. Due to complications on the process parameter of PW mode, the study of parameter effect is needed. In this paper, the effect of PW welding parameters on weld geometry of boron steel using Fibre laser is presented. Pulse overlap (PO), peak power (PP), pulse duration (PD) and pulse repetition rate are the common process parameters for PW mode used in this study. The bead on plate welding was conducted on uncoated boron steel and observation on width and depth of penetration was done. Based on the results, the higher PO produced deeper penetration and also a bad weld appearance. The effective pulse energy and effective peak power density were the result of the actual condition in pulse seam weld related with overlapping index generated from PO condition. The PP and PD were the related parameters that affected the energy of the beam, giving a significant effect on weld width and penetration. The energy of the beam showed the significance on weld geometry in low peak power laser application and the value will increase with the increase of PD. In contrast, PRR had no significant effect on weld geometry. The constant pulse overlap parameter produced constant energy applied for each pulse which led to no effect on weld geometry.

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“…From literature, the ablation fluence threshold values suitable for machining 304L, Al 2 O 3 , and silicon, could be found. The fluence threshold for ablation for a pulse duration of the order of nanoseconds is about 0.25 J/cm for 304L [34], and around 30 J/cm 2 for silicion [35], and up to 22 J/cm 2 for Al 2 O 3 . [36].…”

Section: Fiber Laser Designmentioning

confidence: 97%

Photomechanical Ablation of 304L Stainless Steel, Aluminum Oxide (Al<sub>2</sub>O<sub>3</sub>) Thin Film, and Pure Silicon

Rosa-Santana¹,

Álvarez-Chávez²,

Morano-Okuno³

et al. 2016

OPJ

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Recently, a number of studies have focused on micro-manufacturing processes, which find use in a variety of applications, including the production of microelectromechanical systems (MEMS). The process of ablation in materials is mainly governed by the laser source and scanning speed. The rate of material ablation is influenced by chemical and physical properties. In this work, the energy from a CO 2 laser was used to ablate three different materials, namely, stainless steel 304L, a thin film of amorphous aluminum oxide (Al 2 O 3), and pure silicon, due to their wide use in MEMS technology. The laser parameters used were an average power of 18 W and a spot size of 200 µm. The maximum depth during the photomechanical ablation process was 72 µm in the case of 304L steel and 77 µm in the case of the Al 2 O 3 thin film for a scan rate of 24 mm/min. However, at the same scan rate, silicon did not exhibit any penetration. As expected, while increasing scanning speed the ablation depth decreases due to reduced interaction time between laser and material. The theoretical ytterbium fiber laser shown in this study can thus be employed in the manufacturing of a wide variety of materials used in the production of MEMS as well as those used in clean energy technologies.

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Nanosecond pulsed laser welding of high carbon steels

Cited by 20 publications

References 25 publications

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

The effect of pulse welding parameters on weld geometry of boron steel using low power fibre laser

Photomechanical Ablation of 304L Stainless Steel, Aluminum Oxide (Al<sub>2</sub>O<sub>3</sub>) Thin Film, and Pure Silicon

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Nanosecond pulsed laser welding of high carbon steels

Cited by 20 publications

References 25 publications

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

The effect of pulse welding parameters on weld geometry of boron steel using low power fibre laser

Photomechanical Ablation of 304L Stainless Steel, Aluminum Oxide (Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) Thin Film, and Pure Silicon

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Photomechanical Ablation of 304L Stainless Steel, Aluminum Oxide (Al<sub>2</sub>O<sub>3</sub>) Thin Film, and Pure Silicon