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Abstract:
Mainly in developing countries the root pass in pipe welding is still performed predominantly by means of stick electrodes. This weld critically influences the speed in which a pipeline is constructed. In order to achieve increase in the overall productivity, short-circuiting MIG/MAG welding processes with current control have been being developed and applied to this operation. These semi-mechaniz These semi-mechanized, slag free processes yield welds of satisfactory properties with higher productivity, avoiding inconveniences of the conventional MIG/MAG by means of current waveform control. The applied software methods provide arc and weld pool stability and permit low welder training time. One of these systems was developed by the Welding Laboratory of the Federal University of Santa Cata One of these systems was developed by the Welding Laboratory of the Federal University of Santa Catarina, Brazil (LABSOLDA / UFSC). To enable the development of the software based controlled short-circuiting MIG/MAG welding process, called CCC, process evaluation methods were needed, since monitoring systems for conventional MIG/MAG welding do not apply. Hence, computational tools were designed an Hence, computational tools were designed and implemented specifically for the analysis of the CCC. They are based on oscillographic and statistical information obtained from welding data acquisition, showing influences of parameter adjustment over the achieved results. This allows an adequate iterative optimization of the process and procedures.
Referência:
SILVA, R. H. G. ; Dutra, J. C. . Controlled short-circuiting MIG/MAG welding (CCC) - Process analysis tools. Welding and Cutting, No. 3, p. 162-167, 2009.