发明名称 |
METHOD FOR IMPROVING RESIDUAL STRESS IN PIPE AND APPARATUS |
摘要 |
An method for converting tensile residual stress on an inner surface of a welded part of a pipe to compressive residual stress with use of ice plugs formed by cooling the pipe from the outer surface, comprises the steps of: placing refrigerant containers for forming the ice plugs in the upstream and downstream of a butt-welded part; cooling the outer surface of the pipe to form the ice plugs; and then cooling the outer surface of the pipe with use of at least one refrigerant container for expanding the pipe arranged between the refrigerant containers for forming the ice plugs. When the method is applied to a pipe with a large inside diameter, the method comprises forming the ice plugs at a curved pipe, an elbow or a branch pipe in the upstream and downstream of the butt-welded part.
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申请公布号 |
US2011073219(A1) |
申请公布日期 |
2011.03.31 |
申请号 |
US20100960677 |
申请日期 |
2010.12.06 |
申请人 |
AOIKE SATORU;HISATSUNE MASAKAZU |
发明人 |
AOIKE SATORU;HISATSUNE MASAKAZU |
分类号 |
C21D1/00;B21C37/08;B21D26/02;B21D26/033;B23K31/00;B23K101/06;C21D11/00 |
主分类号 |
C21D1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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