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RESEARCH PAPERS

Experimental and Numerical Study of Multi-Pass Welding Process of Pipe-Flange Joints

[+] Author and Article Information
L. Troive

Department of Mechanical Engineering, Dalarna University, S 781 88, Borlänge, Sweden

M. Näsström, M. Jonsson

Division of Computer Aided Design, Luleå University of Technology, S 971 87 Luleå, Sweden

J. Pressure Vessel Technol 120(3), 244-251 (Aug 01, 1998) (8 pages) doi:10.1115/1.2842053 History: Received February 04, 1997; Revised February 26, 1998; Online February 11, 2008

Abstract

Residual deformations of pipe-flange joints due to thermal strains caused by the multi-pass welding procedure in a manufacturing process are investigated both experimentally and numerically (FEM). To avoid any risk of leakage between two mounted pipes using flange joints, geometrical distortions (twisting) of the flange must be prevented. How the flange is distorted depends both on the groove shape and the weld sequence used. However, to be spared from machine work after the welding process, the distortions have to be minimized. A casting-technique has been developed in order to measure the twisting of the flange after each weld pass. Also, measurements of the residual radial deflection of the pipe have been performed.

Copyright © 1998 by The American Society of Mechanical Engineers
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