Journal ArticleDOI
CO2 laser butt-welding of steel sandwich sheet composites
Konstantinos Salonitis,Konstantinos Salonitis,Panagiotis Stavropoulos,Apostolos Fysikopoulos,George Chryssolouris +4 more
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TLDR
In this article, a theoretical model of the laser welding process is developed for the investigation of laser beam impact on both the core and the outer steel layers of the sandwich material, which is based on a novel idea for the simulation of the heat source through finite element analysis for the estimation of the temperature distribution.Abstract:
Steel sandwich sheets compared with conventional steel exhibit significant performance improvements such as lower density, higher specific flexural stiffness, and better sound and vibration damping characteristics. However, the main challenge for the broad industrial use is that the joining and assembling methods be used in such a way so as not to alter significantly these characteristics. In the present paper, a laser welding of steel sandwich is examined. The feasibility study of the laser butt-welding of sandwich steel sheets with a CO2 laser beam has revealed that such an approach is possible. A theoretical model of the laser welding process is developed for the investigation of the laser beam impact on both the core and the outer steel layers of the sandwich material. The model presented is based on a novel idea for the simulation of the heat source through the finite element analysis for the estimation of the temperature distribution. Additionally, the effect on the quality of the weld, the strength of the welded sheet, and its damping characteristics are also experimentally investigated and prove that laser welding can be considered as an alternative joining process.read more
Citations
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Journal ArticleDOI
Joining of dissimilar materials
TL;DR: Current and emerging joining technologies are reviewed according to the mechanisms of joint formation, i.e.; mechanical, chemical, thermal, or hybrid processes.
Journal ArticleDOI
Real-time penetration state monitoring using convolutional neural network for laser welding of tailor rolled blanks
TL;DR: An innovative monitoring system capable of diagnosing the penetration state during the laser welding process is introduced, which consists of a coaxial visual monitoring platform and a penetration state diagnosis unit based on a convolution neural network.
Journal ArticleDOI
Additive Manufactured Sandwich Composite/ABS Parts for Unmanned Aerial Vehicle Applications.
TL;DR: The fabrication process of low-density acrylonitrile butadiene styrenecarbon with carbon fibre reinforced polymer (CFRP) sandwich layers for UAV structure is proposed to improve the poor mechanical strength and elastic modulus of printed ABS.
Journal ArticleDOI
An integrated modeling of process-structure-property relationship in laser additive manufacturing of duplex titanium alloy
TL;DR: In this paper, a heat source model is proposed for the simulation of the temperature rises in the laser deposition melting additive manufacturing process, which can be used to predict the microstructural evolutions in a multiscale strategy including the grain cluster scale and single grain scale in Monte Carlo model.
Journal ArticleDOI
The systematic parameter optimization in the Nd:YAG laser beam welding of Inconel 625
TL;DR: In this article, the effect of laser parameters such as laser power (LP), spot size (SS), and welding speed (WS) on weld strength and microhardness of the welds has been investigated using the response surface methodology (RSM).
References
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Journal ArticleDOI
A new finite element model for welding heat sources
TL;DR: In this article, a double ellipsoidal geometry is proposed to model both shallow penetration arc welding processes and the deeper penetration laser and electron beam processes, which can be easily changed to handle non-axisymmetric cases such as strip electrodes or dissimilar metal joining.
Journal ArticleDOI
Heat transfer model for cw laser material processing
J. Mazumder,W. M. Steen +1 more
TL;DR: In this paper, a three-dimensional heat transfer model for laser material processing with a moving Gaussian heat source is developed using finite difference numerical techniques, which is physically defined as follows: a laser beam, having a defined power distribution, strikes the surface of an opaque substrate of infinite length but finite width and depth moving with a uniform velocity in the positive x direction.
Journal ArticleDOI
Characterisation of dissimilar joints in laser welding of steel–kovar, copper–steel and copper–aluminium
T.A. Mai,A.C. Spowage +1 more
TL;DR: In this article, the results of an investigation into laser welding of dissimilar metals without filler materials using a 350 W pulsed Nd:YAG laser are presented, where the mixing behavior of the materials in the fusion zone, the microstructure, the presence of defects, hardness and residual stress of the joints were all investigated.
Book
Laser Machining: Theory and Practice
TL;DR: In this article, the authors present a detailed overview of the laser mining process and its application in the field of laser mining applications, including heat transfer and fluid mechanics for laser machining.
Journal ArticleDOI
Dissimilar welding of AISI 310 austenitic stainless steel to nickel-based alloy Inconel 657
TL;DR: In this paper, the authors compared welding of AISI 310 austenitic stainless steel to Inconel 657 nickel-chromium superalloy and showed that Inconels A showed the least susceptibility to hot cracking.
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