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The selection of the materials to a specific application in the Industry has a great importance for the success of a project, particularly when there exists the union of two or more parts, by a weld fillet. The mixture of different classes and chemical compositions in stainless steels in high temperature applications can cause the nucleation and early propagation of fatigue failures, decreasing the life of the product. The present article shows a case study, on which the adequation of the chemical and physical compatibility, and consequent thermal dilation in a specific structure, increased the durability of the component. The study consists of chemical analysis, macroscopic and microscopic evaluation tests on variated materials combination on welding fillets.

Acoustics, in a broad sense, is an essential product attribute in the automotive industry, therefore, it is relevant to study and compare theoretical and numerical predictions to experimental acoustic measurements, key elements of many acoustic development processes. The numerical methods used in the industry for acoustic predictions are widely used for exhaust system optimization. However, the numerical and theoretical predictions very often differ from experimental results, due to modeling simplifications, temperature variations (which have high influence on speed of sound), manufacturing variations in prototype parts among others. This article aims to demonstrate the relevant steps for acoustics development applied in automotive exhaust systems and present a comparative study between experimental tests and computer simulations results for each process. The exhaust system chosen for this development was intended for a popular car 4-cylinder 1.0-liter engine.