Journal ArticleDOI
Online monitoring of cold metal transfer (CMT) process using infrared thermography
K. Renil Thomas,Sreedhar Unnikrishnakurup,P. V. Nithin,Krishnan Balasubramaniam,Prabhu Rajagopal,K. V. Phani Prabhakar,G. Padmanabham,Frank Riedel,Markus Puschmann +8 more
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TLDR
In this paper, an online (passive) thermographic inspection of overlap joints of aluminum and zinc coated steel sheets made by cold metal transfer weld brazing process was explored.Abstract:
Online (passive) thermographic inspection of overlap joints of aluminium and zinc coated steel sheets made by cold metal transfer weld brazing process was explored Different experimental trials were conducted for demonstrating the feasibility of thermographic inspection to detect the porosities, improper weld bead and to differentiate the pre weld temperature The whole process was monitored using infrared cameras in different wavelength region Image analysis algorithms were developed to reconstruct the thermal images that contain the signatures of the weld defects and to extract the pre weld temperature and its evolution with distance from the centre of the weld torch Post-weld radiography lends strong support to the observationsread more
Citations
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Journal ArticleDOI
Three-Dimensional Reconstruction of Welding Pool Surface by Binocular Vision
Gu Zunan,Ji Chen,Chuansong Wu +2 more
TL;DR: In this paper, a preset coordinate system was utilized for camera calibration instead of Zhang's calibration to accelerate the reconstruction speed of welding pool surfaces and a mismatch-elimination algorithm was developed to increase the accuracy of image-matching algorithms.
Dissertation
Prototypage rapide de pièces en acier : étude du dépôt de matière et d'énergie lors de la fusion à l'arc d'un fil par le procédé MIG-CMT
TL;DR: In this article, the authors propose an approach based on the Cold Metal Transfer (CMT) technology for additive fabrication of metal eprouvettes, in which a source of soudage a l’arc appelee CMT is used to assurer the fusion controlee d'un fil metallique and le depot de gouttelettes de metal liquide.
Journal ArticleDOI
FEM-Based Thermogram Correction for Inconel 625 Joint Hardness Clustering
TL;DR: In this article , a temperature measurement credibility increase method is described and evaluated, which is used to reduce the influence of the reflected temperature of the hot torch and the arc on the temperature distribution observed on the surface of the welded joint using an infrared camera.
Journal ArticleDOI
Enhancement of Imperfection Detection Capabilities in TIG Welding of the Infrared Monitoring System
Jacek Górka,Wojciech Jamrozik +1 more
TL;DR: In this article, a reflected temperature correction method was proposed to reduce the uncertainty of absolute temperature measurement with a thermographic camera, which was applied to detect several imperfection types, such as lack of or incomplete penetration as well as incorrect weld shape and size (including burnouts).
Journal ArticleDOI
Thermocouple positioning through capacitive discharge for temperature monitoring in laser welding
Luiz Eduardo dos Santos Paes,Claudio Abilio da Silveira,Milton Pereira,Elisan dos Santos Magalhães,Louriel Oliveira Vilarinho +4 more
TL;DR: In this paper, a Capacitive Discharge Welding device was developed for thermocouple fixing and assessing possible temperature acquisition positions in keyhole laser welding, where the maximum distance at 3.5mm based on an interpolation map was found to correspond to the envisaged austenitization microstructure correlation.
References
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Journal ArticleDOI
Recent development in aluminium alloys for the automotive industry
TL;DR: In this paper, the authors present a review of recent developments in aluminium alloys to improve formability, surface quality in both 5000 and 6000 alloys, and the bake hardening response of 6500 alloys.
Journal ArticleDOI
The CMT short-circuiting metal transfer process and its use in thin aluminium sheets welding
Jicai Feng,Hongtao Zhang,Peng He +2 more
TL;DR: In this article, the wave control characteristics and its droplet transfer process were analyzed by sensing and image method, and the results show that it can realize no-spatter welding and low heat input during welding process.
Journal ArticleDOI
Evaluation of cold metal transfer (CMT) process for welding aluminium alloy
C. G. Pickin,Ken Young +1 more
TL;DR: The cold metal transfer (CMT) is an automated welding process based on dip transfer welding, characterised by controlled material deposition during the short circuit of the wire electrode to the workpiece as mentioned in this paper.
Journal ArticleDOI
The arc characteristics and metal transfer behaviour of cold metal transfer and its use in joining aluminium to zinc-coated steel
TL;DR: In this article, a modified metal inert gas welding process based on short-circuiting the transfer process, characterised by low heat input and no-spatter welding, was used to join aluminium to zinc-coated steel.
Journal ArticleDOI
Suppression of intermetallic reaction layer formation by controlling heat flow in dissimilar joining of steel and aluminum alloy
TL;DR: In this article, the effect of the backing block on the formation of intermetallic reaction layer during laser welding of steel and aluminum alloy dissimilar materials has been investigated, and it was concluded that the thickness of the reaction layer could be suppressed by using a backing block (as a heat sink) for controlling heat flow in welding region.
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