Microstructure and Properties of Copper and 5754 Aluminum Alloy Joints by Friction Stir Welding

Abstract

Welding dissimilar materials aluminum and copper by FSW are of great interest because Al and Cu are two most common engineering materials widely used in many industries. The paper analyzes the microstructure and mechanical properties obtained by butt of dissimilar material Cu - Al alloys (EN-AW-5754) by FSW. The joining by FSW process of the two samples (5 mm thickness) was performed with the pin of the tool tangential to copper plate. The values of the process parameters were the same in both cases: the rotation speed of the pin 1200 [rpm] and feed rate 60 [mm / min]. The microstructure was examined in 6 zones covering the whole thickness of the plates, Vickers microhardness was measured along a perpendicular line to the nugget and residual stresses.

Corrosion of Welded Metal Structures of Mining Equipment

“…An analysis of the research on the relationship between granule size and resistance to corrosion for a number of light metals (Mg, Al and Ti) and transition metals (Fe / Steel, Co, Ni, Cu and Zn) has made it possible to identify a number of critical factors such as the environment, texture, rezidual stress, the segregation of impurities to be considered to assess whether and how the variation in the size of the crystalline grains can affects the electrochemical behavior of a specific alloy in a given environment [10][11][12][13].Metallic structures of mining equipment operate at temperatures between -30 0 C ÷ + 40 0 C. Thus, certain conditions are created for the occurrence of the creep phenomenon. In these circumstances, the results are useful for determining, for example, the load capacity of a structure under fire conditions and predicting regarding the length of its life.The chemical composition of low-alloy steels influences their welding behavior [14]. Thus, the best mechanical properties of welded joints were obtained for two steels having 1.92 % Mn and 0.02 % Ti respectively 1.40 % Mn si 0.08 % Ti.…”

“…The chemical composition of low-alloy steels influences their welding behavior [14]. Thus, the best mechanical properties of welded joints were obtained for two steels having 1.92 % Mn and 0.02 % Ti respectively 1.40 % Mn si 0.08 % Ti.…”