Interface shape and microstructure controlled dissimilar friction stir lap welded steels. (May 2013)

• Record Type: Journal Article
• Authors: Fujii, H; Chung, Y D; Sun, Y F; Tanigawa, H
• Is Part Of: Science and technology of welding & joining. Volume 18:Number 4(2013:May)
• Page Start: 279
• Page End: 286
• Publication Date: 2013-05
• Subjects: Interface shape -- Dissimilar friction stir lap welding -- Yield strength -- Microstructure; Welding -- Periodicals; Joints (Engineering) -- Periodicals; Surfaces (Technology) -- Periodicals; 671.52
• DOI: 10.1179/1362171812Y.0000000104
• Languages: English
• ISSNs: 1743-2936

Abstract

Abstract : When fusion welding is conducted on the dissimilar materials between a reduced activation ferritic/martensitic steel F82H steel and an austenite stainless steel SUS 316 steel, δ ferrite is generally formed and inevitably deteriorates the weld properties. In this study, dissimilar welding of F82H to SUS 316 steel was successfully achieved by friction stir lap welding technique. It revealed that the shape and microstructure of the joint interface can be controlled by controlling the welding temperature, in another word, by changing the applied load. By controlling the welding temperature at ∼710°C, a sound dissimilar joint can be obtained with a smooth joint interface and no mixed microstructure, despite the relative overlapping position of the steel plates. All the dissimilar joints showed high shear tensile strength and fracture in the base metal of F82H steel plate, which has lower strength than the SUS 316 steel plate at room temperature.