Effect of weld faying part groove shape on reduction of inner flash in steel pipe joints fabricated by friction welding

• 来源期刊: 先进制造进展（英文版）
• 关键词: Friction welding Steel pipe Inner flash Groove shape Taper Joint strength Fracture
• 年，卷（期）: 2019,（4）
• 页码范围: 411-422
• 页数: 12页
• 语种: 英文

摘要

The groove shape of the weld faying part was investigated to obtain an ideal pipe friction-welded joint th,at had a fracture in the base metal and no inner flash of it.The steel pipe had inner and outer diameters of 8.0 mm and 13.5 mm,respectively,and the weld faying surface was of a basic flat shape(butt)type.Moreover,stepped and tapered groove shapes were prepared.Pipe groove shapes were welded with a friction speed of 27.5 s-1 and a friction load of 2.79 kN.Joining phenomena during the welding process were observed,and the tensile strength of joints was evaluated.The joints,that fabricated with flat or step groove shapes,made with a friction time at which the friction torque reached the initial peak did not have the tensile strength of the base metal nor a fracture in the base metal.However,the joints fabricated with a friction time that reached past the initial peak had a large ftash,and they contained a fracture in the base metal.In contrast,when joints were made with a gently tapered groove shape with a friction time reaching the time of the initial peak,they achieved a fracture in the base metal,despite having an extremely small inner ftash.Therefore,the shape at the weld faying Part was capable of reducing the ftash exhausted from the weld interface.