A study on mechanical properties and microstructure of microalloyed steels in the case of arc welding process

Abstract

This research aims to study the mechanical properties and microstructure of micro-alloy from arc-welding process. The study provides results comparing non-welded micro-alloy with micro-alloy welding by E8018 and E7018 welding electrodes. The results come from mechanical tests and microstructure examinations. The mechanical tests include the Brinell hardness test, impact test and tensile test. Microstructure, chemical components and Grain size are analyzed by 1) examination with a scanning electron microscope for microstructure and Grain size, 2) X-ray signal detection for chemical components. After running examinations and analyzing the results following mechanical procedure, the research shows that micro- alloy welded by ferrite-based E7018 electrode provided the highest factor for impact test, while welding by pearlite- based E8018 electrode provided the best result in both tensile and hardness tests.