EVALUATION OF CORROSION RESISTANCE OF MIG BRAZED STEEL SHEETS
Abstract
The paper presents the results of quality evaluation of brazed joints made by Gas Metal Arc Brazing (GMAB) method. The influence of brazing direction and brazing current on the quality of joints as well as the influence of brazing parameters on the corrosion resistance of joints were evaluated. The brazing was realized on the device CLOOS 303 MC4 with the shielding gas of Argon 4.60. The CuSi3 braze was used as a filler material. A drawing-grade steel sheet DX51D was used as a brazed material. Corrosion resistance of joints was evaluated on the base of accelerated tests in three environments namely wet atmosphere, NaCl solution and atmosphere of SO2. The duration of the test was chosen according to STN EN ISO 3231 standard, with the following number of testing cycles: 1, 2, 3, 7, 14, 21 and 28 days. The using of right-hand method of brazing causes the destruction of zinc coating in the places of joint in a longer distance from braze in comparison to left-handed method. The results were obtained from accelerated corrosion test with the most aggressive environment of SO2.
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