Strength and hardness studies of C44300 tube to AA7075-T651 tube plate threaded and unthreaded dissimilar joints fabricated by friction welding process

• Main Authors: E. Radhakrishnan, L.A. Kumaraswamidhas, K. Palanikumar, D. Muruganandam
• Format: Article
• Language: English
• Published: Elsevier 2019-07-01
• Series: Journal of Materials Research and Technology
• Online Access: http://www.sciencedirect.com/science/article/pii/S2238785418313358

Friction welding is an important process used nowadays especially for joining dissimilar metals in engineering and allied industries. The joining of dissimilar materials is different from the conventional materials and needs proper care and technology advancement. The objective of the present research is to investigate the strength of friction welded joints in the absence of backing block. Two conditions of tube and tube plates with thread pair and without thread pairs are considered for the experimentation. The effect of process parameters on the strength has been arrived. Microstructure at the weld joint interface indicates the high level of refinement at the weld zone. Scanning Electron Microscopic (SEM) images are used for investigating the intermolecular bonding of the tube and tube plate. Micro cracks are observed at the interface. Absence of backing block is the cause for the defect. Energy Dispersive Analysis (EDX) and X-Ray Diffraction (XRD) test are used for analyzing the material properties and quantification of crystalline phases. Keywords: Dissimilar joints, Admiralty brass (C44300), Aluminum alloy (AA7075–T651) friction welding, Compressive strength, Microstructure, Micro hardness