Microstructure of the Weld Metal in CK45 Carbon Steel

In recent years, the process of gas metal arc welding (GMAW) has received much attention and has been progressively applied in various industries, such as automobile manufacturing and shipbuilding. The arc voltage, welding current, and welding speed are three important and independent variables of this process. On the other hand, the microstructure of the weld metal is an important metallurgical characterization that may strongly affect its physical and mechanical properties. Therefore, we focus our attention on the microstructural evolutions of the weld metal in CK45 carbon steel welded by the robotic GMAW process.