Abstract
Compared to MAG welding, the main advantage of MIG arc brazing of zinc-coated steel sheets with copper-based filler metal is the resistance of the joint to atmospheric corrosion. However, evaporation of zinc coating can occur in the heat affected zone if an incorrect temperature cycle for brazing is chosen and the joined construction can thus lose its corrosion resistance as a whole. This paper introduces a model which, using finite element method, allows simulation of temperature field progress in the heat affected zone and optimization of MIG brazing parameters for lapped joints. The model was verified by a series of experiments with zinc coated steel sheet FeP05GZ100MB (EN 10 142/90) with thickness of 1.5 mm and filler metal of CuSi3 type.

Key words
simulation of heat affected zone, finite element method (FEM), zinc coated steel sheet, arc brazing

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