TY - JOUR A1 - Unnikrishnakurup, Sreedhar A1 - Kidangan, R. T. A1 - P. Vengara, N. A1 - Balasubramaniam, Krishnan A1 - Rajagopal, P. A1 - Phani Prabhakar, K. V. A1 - Padmanabham, G. T1 - Application of infrared thermography technique for the monitoring of cold metal transfer (CMT) joining of aluminium to galvanized steel N2 - In this study, the feasibility of using non-contact Infrared thermography as a potential tool to monitor the CMT welding process is explored. The presence of internal defects such as porosity, lack of filler material deposition and formation of improper weld bead produce perturbations in the surface temperature which can be identified using an Infrared thermography technique. We present recent results obtained from online monitoring of the the dissimilar joining using CMT weld brazing of Aluminum and Steel using a transmission mode measurement approach. The effect of loss of zinc coating on the weldability of the cold metal transfer joining of aluminum to galvanised steel was investigated. A correlation between measured online thermal indications with the weld anomalies is successfully attempted and the results are compared with the conventional post-weld NDT inspection methods. T2 - 19th World Conference on Non-Destructive Testing (WCNDT 2016) CY - Munich, Germany DA - 13 June 2016 KW - Infrared thermography KW - CMT welding KW - Weld defects KW - Online monitoring PY - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-389155 UR - http://ndt.net/?id=19475 SN - 1435-4934 VL - 21 IS - 7 SP - 1 EP - 8 PB - NDT.net CY - Kirchwald AN - OPUS4-38915 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kidangan, R. T. A1 - Unnikrishnakurup, Sreedhar A1 - P. Vengara, N. A1 - Balasubramaniam, Krishnan A1 - Rajagopal, P. A1 - Phani Prabhakar, K. V. A1 - Padmanabham, G. A1 - Riedel, F. A1 - Puschmann, M. T1 - Online monitoring of cold metal transfer (CMT) process using infrared thermography N2 - 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 ist evolution with distance from the centre of the weld torch. Post-weld radiography lends strong Support to the observations. KW - Infrared thermography KW - Dissimilar joints KW - Online monitoring KW - Cold metal transfer process PY - 2016 U6 - https://doi.org/10.1080/17686733.2016.1229330 SN - 1768-6733 SN - 2116-7176 VL - 14 IS - 1 SP - 68 EP - 78 PB - Taylor & Francis AN - OPUS4-38910 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Unnikrishnakurup, Sreedhar A1 - Thomas, R. A1 - Balasubramaniam, Krishnan A1 - Narayanan, L. A1 - Phanikumar, G. T1 - Dissimilar metal joint quality measurement using infrared thermography: Experimental and numerical approach for the application to CMT welding N2 - Joining of dissimilar material has become highly popular research subject in the automobile industry due to the reduced weight and thereby increasing the fuel efficiency. Infrared thermography can be used as a natural tool to measure the temperature near the welding region and correlate the distribution of temperature to the weld quality. In the present work the quality of the dissimilar welded sample is identified using the temperature distribution in the vicinity of the weld pool region. A numerical model for CMT continues welding process has been modeled and simulated for the first time and compared with the experimental measurement. T2 - The 13th International Conference on Quantitative Infrared Thermography - QIRT 2016 CY - Gdansk, Poland DA - 04.07.2016 KW - Online monitoring KW - CMT welding KW - Dissimilar joint KW - FEM PY - 2016 UR - https://www.ndt.net/?id=20704 U6 - https://doi.org/10.21611/qirt.2016.056 SP - 389 EP - 390 PB - Gdansk University of Technology CY - Gdansk AN - OPUS4-39078 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -