Flexible scanner-based laser surface treatment

Klocke, Fritz; Brecher, Christian; Heinen, Daniel; Rosen, Chris-Jörg; Breitbach, Tobias

doi:10.1016/j.phpro.2010.08.169

Cited by 20 publications

(10 citation statements)

References 2 publications

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“…In addition to the latter, when dealing with already manufactured parts, LC is often used to enhance the wear or corrosion resistance of diverse surfaces and as a way of repairing damaged surfaces. Elements such as tools and dies are able to achieve longer life-times thanks to the addition of functional layers on their surface [9], by coating cheaper bulk materials with more expensive and mechanically better materials, and thus achieving enhanced surface properties.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Process Parameter Influence in Laser Cladding of 316L Stainless Steel

Alvarez

Montealegre²,

Pulido-Jiménez

et al. 2018

JMMP

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Laser Cladding is one of the leading processes within Additive Manufacturing technologies, which has concentrated a considerable amount of effort on its development. In regard to the latter, the current study aims to summarize the influence of the most relevant process parameters in the laser cladding processing of single and compound volumes (solid forms) made from AISI 316L stainless steel powders and using a coaxial nozzle for their deposition. Process speed, applied laser power and powder flow are considered to be the main variables affecting the laser cladding in single clads, whereas overlap percentage and overlapping strategy also become relevant when dealing with multiple clads. By setting appropriate values for each process parameter, the main goal of this paper is to develop a processing window in which a good metallurgical bond between the delivered powder and the substrate is obtained, trying simultaneously to maintain processing times at their lowest value possible. Conventional metallography techniques were performed on the cross sections of the laser tracks to measure the effective dimensions of clads, height and width, as well as the resulting dilution value. Besides the influence of the overlap between contiguous clads and layers, physical defects such as porosity and cracks were also evaluated. Optimum process parameters to maximize productivity were defined as 13 mm/s, 2500 W, 30% of overlap and a 25 g/min powder feed rate.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Process Parameter Influence in Laser Cladding of 316L Stainless Steel

Alvarez

Montealegre²,

Pulido-Jiménez

et al. 2018

JMMP

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“…4,5 The interest toward using scanning optics in laser cladding and other surface modification processes has risen in recent years. Klocke et al 6 show in their study that scanner optics can be used to increase the flexibility of laser cladding process. In terms of laser cladding, flexibility mainly means numerical adjustment of the size of laser beam material interaction zone (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1) and modification of energy input. The numerical adjustment of scanning amplitude enables the width adjustment of the laser beam material interaction zone, [4][5][6] and energy input modification can be achieved by using the power adjustment feature of the scanner. 4 Power adjustment in turn enables laser power adjustment across the clad bead when cross-section shape of the clad bead can be modified.…”

Section: Introductionmentioning

confidence: 99%

Laser cladding with scanning optics: Effect of scanning frequency and laser beam power density on cladding process

Pekkarinen

Salminen

Kujanpää

2014

Journal of Laser Applications

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Scanning optics is an effective way to manipulate a laser beam for laser cladding. The numerical adjustment of the scanner gives a great deal of flexibility to the cladding process. However, the effect of the scanned beam on the cladding process itself has not been studied very thoroughly so far. This study concentrates on explaining how the scanning frequency and power density of the laser beam affect the stability of the cladding process. The results showed that both of these factors significantly influence the process stability and the outcome of the cladding process. If the local specific energy input was over 2.46 J/mm2, the process was noticed to be unstable. This limit was cross when scanning frequency was under 40 Hz. Power density's limit value for stable process was found to be 191 kW/cm2 and higher power densities than this was found to produce unstable process. If the cladding process was found to be unstable, dilution increased significantly and process started to resemble more laser alloying.

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“…2 Even though both cladding with pneumatic powered delivery and cladding using scanning optics are relatively old techniques, their combination is relatively unstudied. [4][5][6] In these studies, scanning optics has been used mainly as an optical tool to spread out the energy of laser beam and not focusing on how scanning optics changes the process or what kind of opportunities it creates. 3 However, in recent years, interest toward using scanning optics in laser cladding has been growing, and there have been some studies concerning this mater.…”

Section: Introductionmentioning

confidence: 99%

“…Difference between these two cladding methods can be found in guiding of laser light. 4,10,11 Figure 1 shows the principle of cladding with scanning optics. Clad material is fed to this melt pool, when laser beam is moved forward; clad bead is formed from molten material, when it is solidified.…”

Section: Introductionmentioning

confidence: 99%

Laser cladding with scanning optics: Effect of power adjustment

Pekkarinen

Kujanpää

Salminen

2012

Journal of Laser Applications

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Articles you may be interested inLaser cladding with scanning optics: Effect of scanning frequency and laser beam power density on cladding process J. Laser Appl. 26, 032002 (2014); 10.2351/1.4868895 High-sensitive scanning laser magneto-optical imaging system Rev. Sci. Instrum. 81, 013701 (2010); 10.1063/1.3276710 Laser powered heating stage in a scanning electron microscope for microstructural investigations at elevated temperatures Rev. Sci. Instrum. 79, 043902 (2008);Laser cladding with fiber laser using scanning optics is a relatively new way of laser cladding. Modern oscillating scanners enable laser power adjustment according to scanning direction. This is a versatile tool for making process more stable as well as modifying the shape of clad bead. Laser cladding was made using 5 kW IPG fiber laser with ILV-oscillating scanner, using 316L powder as clad material and S355 mild steel plate as substrate material. These tests showed that power adjustment is necessary for cladding process stability when sinusoidal scanning is used. Power adjustment can be used also for adjusting the geometry of clad bead and for constructing simple geometries. The oscillating scanner enables flexibility for controlling the geometry of clad bead and process stability compared to the conventional laser cladding with static optics. V C 2012 Laser Institute of America.

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Flexible scanner-based laser surface treatment

Cited by 20 publications

References 2 publications

Analysis of the Process Parameter Influence in Laser Cladding of 316L Stainless Steel

Analysis of the Process Parameter Influence in Laser Cladding of 316L Stainless Steel

Laser cladding with scanning optics: Effect of scanning frequency and laser beam power density on cladding process

Laser cladding with scanning optics: Effect of power adjustment

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