This diploma thesis is focused on overall research of the quality of joining steel and aluminum alloy using the CMT welding process. The theoretical part describes the principle and the technology of the welding system that allows joining dissimilar materials by an electric arc. Attention is also given to other modes such as CMT Advanced, CMT Pulse and CMT Advanced Pulse, which further improve the innovative process. These modifications include an efficient tandem method CMT Twin that uses two electric arcs in various combinations. The main aim of the experiment is assessment of the quality of created CMT joints. Individual tests are conducted to evaluate the corrosion resistance in an aggressive environment (salt fog). The testing subsequently evaluates mechanical properties by a destructive tensile test to determine the tensile strength. Part of the quality assessment is metallographic analysis including determining the elemental composition of the weld
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