Análise de deformações e empenamentos em peças de aço carbono para cilindros hidráulicos

Abstract

Changes in the concept of tractor manufacturing led to changes in cylinder production processes and increased complexity of welding processes, leading to increased distortion and warping. Distortions and / or bends in hydraulic cylinder components are not easily detectable until assembled. Components already have a high added value and rework becomes more difficult and parts scrapping is often more advantageous. In this study, we analyzed 5 alternative welding methods to the current one, performed on 18 samples. It was observed through measurements and destructive testing, variations on ovalization, tube flexion in directions 0° and 90° and penetration of welds. Ovalization increased in all processes, except for the method that used the current parameter with modified sequence and post heat, which showed results similar to the current method. There was a reduction in bending distortion in the 0° direction of 0.03 mm using the heat input reduction method. In the 90° direction, the method that used the current parameter with modified sequence and post heat, presented average distortions less than 0.03 mm, obtaining the best results in this direction. T-test variance analysis method showed that only for the point D in the heat input reduction method at the 0° direction, a significant difference was obtained compared to the current method. We concluded that none of the methods used were efficient in reducing the total distortion by welding of the parts (sic).