Journal ArticleDOI
Understanding the process parameter interactions in multiple-pass ultra-narrow-gap laser welding of thick-section stainless steels
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TLDR
In this article, the effects of laser power, wire feed rate, and welding speed on the weld homogeneity, integrity, bead shape, gap bridgability and surface oxidation were studied.Abstract:
In laser welding, typical welding penetration depths are in the order of 1–2 mm/kW laser power. The multipass laser welding technique, based on the narrow-gap approach, is an emerging welding technology that can be applied to thick-section welds by using relatively low laser power, but the process is more complicated since it is necessary to introduce filler wire to narrow-gap weld configurations. The aim of this work was to understand significant process parameters and their interactions in order to control the weld quality in ultra-narrow-gap (1.5 mm gap width) laser welding of AISI grade 316L stainless steel. A 1-kW IPG single-mode fiber laser was used for welding plates that were 5 to 20 mm in thickness using the multiple-pass narrow-gap approach. Design of experiments and statistical modelling techniques were employed to understand and optimise the processing parameters. The effects of laser power, wire feed rate, and welding speed on the weld homogeneity, integrity, bead shape, gap bridgability and surface oxidation were studied. The results were evaluated under different optimising constraints. The results show that the models developed in this work can effectively predict the responses within the factors domain.read more
Citations
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Journal ArticleDOI
Identification and analysis of reverse logistics barriers using fuzzy Delphi method and AHP
TL;DR: In this paper, an eleven-step research methodology is proposed to identify and evaluate the barriers for reverse logistics (RL) implementation in the Brazilian context, and a compilation of the RL barriers from a systematic literature review process, a list of most common RL barriers accepted by Brazilian organizations and a priority ranking of RL barriers for the electrical-electronic industry sector in Brazil.
Journal ArticleDOI
An iterated greedy algorithm with optimization of partial solutions for the makespan permutation flowshop problem
TL;DR: The possibility of re-optimizing partial solutions obtained after the solution destruction step of the iterated greedy algorithm is explored and it is shown that with this extension, the performance of the state-of-the-art algorithm for the PFSP under makespan criterion can be significantly improved.
Journal ArticleDOI
A comparison of residual stresses in multi pass narrow gap laser welds and gas-tungsten arc welds in AISI 316L stainless steel
TL;DR: In this paper, a preliminary investigation of the through-thickness 2D residual stresses distributions, distortions, and plastic strain characteristics, for the narrow gap laser welding (NGLW) process using material thicknesses up to 20mm.
Journal ArticleDOI
Welded joints integrity analysis and optimization for fiber laser welding of dissimilar materials
TL;DR: In this article, an optimization method by taking the integrity of the weld bead and weld area into consideration is proposed for FLW of dissimilar materials, the low carbon steel and stainless steel.
Journal ArticleDOI
Power factor model for selection of welding parameters in CW laser welding
TL;DR: In this article, an empirical model for laser welding is presented, which enables achievement of a particular depth of penetration independent of the beam diameter, where the user selects a weld shape which meets a certain quality requirements and the depth of welding that has to be accommodated.
References
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Book ChapterDOI
On the Experimental Attainment of Optimum Conditions
George E. P. Box,K. B. Wilson +1 more
TL;DR: The work described in this article is the result of a study extending over the past few years by a chemist and a statistician, which has come about mainly in answer to problems of determining optimum conditions in chemical investigations, but they believe that the methods will be of value in other fields where experimentation is sequential and the error fairly small.
Journal ArticleDOI
Optimization of different welding processes using statistical and numerical approaches - A reference guide
TL;DR: A comprehensive literature review of the application of evolutionary algorithms, evolutionary algorithms and computational network in the area of welding has been introduced herein and was classified according to the output features of the welding, i.e. bead geometry and mechanical properties of the welds.
Journal ArticleDOI
Effect of laser welding parameters on the heat input and weld-bead profile
TL;DR: In this paper, the effect of laser power (1.2-1.43kW), welding speed (30-70 cm/min) and focal point position (−2.5 to 0mm) on the heat input and the weld-bead geometry (i.e. penetration, welded zone width, and heat affected zone width (W HAZ )) was investigated using response surface methodology (RSM).
Journal ArticleDOI
Using Taguchi method to optimize welding pool of dissimilar laser-welded components
E. M. Anawa,Abdul Ghani Olabi +1 more
TL;DR: In this paper, a CO 2 continuous laser welding process was successfully applied and optimized for joining a dissimilar AISI 316 stainless-steel and low carbon steel plates with the objective of producing welded joint with complete penetration, minimum fusion zone size and acceptable welding profile.
Journal ArticleDOI
Effects of MIG process parameters on the geometry of the bead in the automatic surfacing of stainless steel
N. Murugan,R.S. Parmar +1 more
TL;DR: In this article, the development of mathematical equations using a four-factor 5-level factorial technique to predict the geometry of the weld bead in the deposition of 316L stainless steel onto structural steel IS 2062 is presented.