In this work were calculated and compared the welding costs for each of the tests performed to determine operational parameters and economically feasible for welding with GMAW process in a short circuiting transfer mode, aiming at a correct weld overlay with nickel alloy on a substrate of C-Mn steel. The number of tests to be performed was determined by using the Taguchi method that divided the tests into two L9 orthogonal arrays resulting in a total of 18 experiments. To compare the costs incurred in each of the tests we used the total direct cost of welding a layer with dimensions of 55 x 190 mm, using an overlap of 50%. Based on the results of the tests were pre-selected four tests (R7, R11, R12 and RC4), among which the test R11 has the lowest cost. But it is noteworthy that the four pre-selected test alloy 625 was used as filler metal, because the electrode wire of this alloy has a much lower cost compared to other alloys (C-276 and 686). Thus the selection of the filler metal for weld overlay was restricted only to alloy 625.
Welding Costs; Weld Overlay; Nickel alloys; GMAW; Short circuiting
