Abstract
The application of high strength steels is strongly diff used in the engineering industry, especially in applications where weight reduction is important, such as the industry of agricultural machines and trailers industry. This investigation aims at conducting a comparative analysis on the mechanical behavior (micro hardness profile and tensile test) of welded joint by GMAW – Gas Metal Arc Welding – using different values of current power and voltage. The welding process was made using robotic system to maintain homogeneity along the joint, the right distance and position during the total weld joint length. The mechanical behaviors were performed with the optical microscope, micro hardness profiles analysis and tensile test. The results showed that the mechanical properties between the base metal and the weld in a structural steel welded joint have a primary importance in the final test results. Keywords: welding, micro hardness profile, tensile test, high strength low alloy steel.
Highlights
A preocupação crescente com o meio ambiente e a redução do consumo de combustível tem motivado os fabricantes de automóveis a utilizar materiais mais leves, com maior resistência mecânica e elevada ductilidade
Micro-hardness profiles related to the samples – (a) 700MPa, (b) 1,000MPa
Os ensaios de tração indicaram resultados positivos no comportamento mecânico das amostras do material 700MPa quando comparado ao 1.000Mpa com a utilização de um metal de solda com melhores propriedades mecânicas - respeitado o valor mínimo especificado para resistência a tração do metal base de 700MPa. Fator não constatado nas amostras do material de 1.000MPa, pois as mesmas tiveram um decréscimo de aproximadamente 20% resistência mecânica
Summary
As juntas soldadas foram confeccionadas utilizando-se como material base chapas de aço de alta resistência de 1.000MPa com 2mm de espessura e 700MPa com 3mm de espessura. Os valores típicos de composição química e propriedades mecânicas conforme especificações dos fornecedores estão descritos nas Tabelas 1 a 3
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