Development of process to control residual stress distribution of butt weld joint of cylinder

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:205398

Nayama, Michisuke; Sakamoto, Naruo; Akitomo, Norio ^[1]; Toyoda, Masao ^[2]

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1. Mitsubishi Heavy Industries Ltd., Takasago, Hyogo (Japan). Takasago R and D Center
2. Osaka Univ., Suita, Osaka (Japan)

The authors develop new process to control residual stress distribution of butt weld joint of cylinder. This process, which is heating circularly at both side of butt weld joint and letting cool, can reduce tensile residual stress on inner surface near weld joint by operation from only outside of cylinder and its required temperature rise of this process is lower than ordinary PWHT (Post Weld Heat Treatment) process. This paper describes the procedure and conditions of the process named ``both side heating`` by authors. The appropriate range of process conditions to get sufficient effect is confirmed by FEM stress history analysis and experiment in this paper. Experiments show that the inner residual stress near weld is reduced to compression from over yield stress at as weld condition in austenitic stainless steel pipe to pipe joints, pipe to elbow joints and pipe to valve joint after application of the process.

• OSTI ID: 205398
• Report Number(s): CONF-950695--; ISBN 0-7918-1309-6
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CALCULATION METHODS
OFFSHORE PLATFORMS
STRESS ANALYSIS
TENSILE PROPERTIES
WELDED JOINTS