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Title: Process parameter optimization of lap joint fillet weld based on FEM–RSM–GA integration technique

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Advances in Engineering Software
Additional Journal Information:
Journal Volume: 79; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-04 16:12:58; Journal ID: ISSN 0965-9978
Country of Publication:
United Kingdom

Citation Formats

Islam, M., Buijk, A., Rais-Rohani, M., and Motoyama, K. Process parameter optimization of lap joint fillet weld based on FEM–RSM–GA integration technique. United Kingdom: N. p., 2015. Web. doi:10.1016/j.advengsoft.2014.09.007.
Islam, M., Buijk, A., Rais-Rohani, M., & Motoyama, K. Process parameter optimization of lap joint fillet weld based on FEM–RSM–GA integration technique. United Kingdom. doi:10.1016/j.advengsoft.2014.09.007.
Islam, M., Buijk, A., Rais-Rohani, M., and Motoyama, K. 2015. "Process parameter optimization of lap joint fillet weld based on FEM–RSM–GA integration technique". United Kingdom. doi:10.1016/j.advengsoft.2014.09.007.
title = {Process parameter optimization of lap joint fillet weld based on FEM–RSM–GA integration technique},
author = {Islam, M. and Buijk, A. and Rais-Rohani, M. and Motoyama, K.},
abstractNote = {},
doi = {10.1016/j.advengsoft.2014.09.007},
journal = {Advances in Engineering Software},
number = C,
volume = 79,
place = {United Kingdom},
year = 2015,
month = 1

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.advengsoft.2014.09.007

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Cited by: 11works
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  • This study is aimed at evaluating the effect of incomplete penetration on the fatigue behavior of fillet welded assemblies subjected to tension and bending. Its purpose is to evaluate more precisely the conditions of slow extension of microcracks during the initiation stage. The preferred sites for crack initiation at the weld root or the weld toe were determined by using the finite element method. The experimental program, including 120 fatigue tests, was conducted on 10 mm and 30 mm thick E-36-4 steel plates welded with gas metal arc welding (GMAW) and shielded metal arc welding (SMAW) processes. The results evidencedmore » a propagation phase of short cracks, which may represent 30 to 90% of the fatigue life, and the existence of a critical size of incomplete joint penetration had no significant effect on the fatigue life of fillet welded assemblies subjected to tension and bending. The numerical calculations, made with the finite element method, have permitted the modeling of the crack propagation paths as a function of the size of incomplete penetration and the determination of the relations Kl = f(a/t) for each zone of failure of the fillet weld.« less
  • Weld joint penetration monitoring and control are fundamental issues in automated welding. A skilled human operator can determine the weld penetration from the geometrical appearance of the weld pool. To emulate this using machine vision, a high-shutter-speed camera assisted with pulsed laser illumination is used to capture the clear image of the weld pool.d The pool boundary is extracted by the developed real-time image processing algorithm. In order to emphasize the emulation of the human operator, general terms, i.e., size, shape and geometrical appearance, are used for the conceptual discussion, whereas more specific terms such as length, width, and rearmore » angles are used in the detailed analysis. In particular, the size will be specified by the pool width and length, and the shape will be defined using the proposed rear angle of the weld pool. The geometrical appearance is described by a combination of the size and shape parameters. To investigate the relationships, which could be complicated, between the weld penetration and different parameters, neural networks are used because of their capability for modeling complicated nonlinear functions. Extensive experiments have been developed to measure the weld penetration from the captured image in 200 ms using the neural network and real-time image processing.« less
  • In the present investigation, an in-situ multi-component reinforced aluminum based metal matrix composite was fabricated by the combination of self-propagating high-temperature synthesis and direct metal laser sintering process. The different mixtures of Al, TiO{sub 2} and B{sub 4}C powders were used to initiate and maintain the self-propagating high-temperature synthesis by laser during the sintering process. It was found from the X-ray diffraction analysis and scanning electron microscopy that the reinforcements like Al{sub 2}O{sub 3}, TiC, and TiB{sub 2} were formed in the composite. The scanning electron microscopy revealed the distribution of the reinforcement phases in the composite and phase identities.more » The variable parameters such as powder layer thickness, laser power, scanning speed, hatching distance and composition of the powder mixture were optimized for higher density, lower porosity and higher microhardness using Taguchi method. Experimental investigation shows that the density of the specimen mainly depends upon the hatching distance, composition and layer thickness. On the other hand, hatching distance, layer thickness and laser power are the significant parameters which influence the porosity. The composition, laser power and layer thickness are the key influencing parameters for microhardness. - Highlights: • The reinforcements such as Al{sub 2}O{sub 3}, TiC, and TiB{sub 2} were produced in Al-MMC through SHS. • The density is mainly influenced by the material composition and hatching distance. • Hatching distance is the major influencing parameter on porosity. • The material composition is the significant parameter to enhance the microhardness. • The SEM micrographs reveal the distribution of TiC, TiB{sub 2} and Al{sub 2}O{sub 3} in the composite.« less
  • Multiscale plastic deformation in the heat affected zone (HAZ) of a Ni-based single crystal superalloy has been characterized using white microbeam synchrotron diffraction measurements together with OIM imaging, electron and optical microscopy. Characteristic length scales on the macro, meso and nano scale are determined. Dissolution of the gamma' - phase particles during heating and secondary precipitation of gamma' during cooling is found, as well as formation and multiplication of dislocations. This process is more intense as one approaches the fusion line (FL). In the regions immediately neighboring the FL, gamma' - phase particles dissolve completely and re-precipitate from the solidmore » solution in the form of very small (10-20nm) particles. In the immediate vicinity of the FL, the temperature gradient and the rate of it's change reaches maximal values and causes the formation of large amounts of dislocations. Dislocations are concentrated in the gamma matrix of the single crystal superalloy. X-ray Laue diffraction (both conventional and microbeam) and electron microscopy show that alternating dislocations slip systems dominate in the HAZ with Burgers vector b=[110] and dislocation lines [1-12] and [1-1-2] ; or b=[-110], dislocation lines [112] and [11-2] . Each of these two dislocation groups forms two Z-shaped dislocation lines fluctuating around two cubic directions [100] and [010]. Local lattice rotations in different zones of the weld joint are linking with the microslip events in different zones of the weld.« less