Induction heating method and apparatus for relieving residual stress in welded joint between main and branch pipes
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United States of America Patent
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Sep 15, 1987
Grant Date -
N/A
app pub date -
May 29, 1985
filing date -
May 31, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heating method and heating apparatus for uniformly or substantially uniformly heating a predetermined portion of main and branch pipes including a welded joint therebetween of a main-and-branch-pipe assembly, thereby relieving the residual stress in the welded joint between the main and branch pipes. The defects and problems encountered in the conventional residual-stress-relief treatment processes can be substantially overcome such as complication in winding fabrication at the branch pipe which results in bad control of temperature; a mock-up test being needed for fabrication of an inductor; and existence of a non-heated zone resulting in unbalance of the stresses so that the effects of the residual stress-relief treatment are reduced.
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