The goal of this work consist of evaluating the sensibility of intergranular corrosion in welded joints of AISI 409 e AISI 439 applied in vehicular exhaustion systems, considering the type of welding process as being manual and automatic. For acquiring the test results were performed in DL-EPR (Reactivation of Duplo Loop Dynamic Potential) with 0,5M of H 2 SO 4 in 25°C, and mass lost according to ASTM A763 (Procedure X) for corrosion intergranular and ASTM G 48 (Method A) for pit corrosion. The results showed that corrosion depends on alloy elements in those steels and the increase of temperature in base metal due to weld wire speed.
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