发明名称 |
Method of detecting a pinhole at a welded portion of an article |
摘要 |
Suction is applied to a pipe of an article. Then, the interior of the pipe is maintained under vacuum conditions for a period of several seconds. This is checked or monitored by a pressure switch. If the pressure in the pipe is raised from the predetermined level, then a pinhole is formed at a welded portion of the pipe to be examined.
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申请公布号 |
US5235845(A) |
申请公布日期 |
1993.08.17 |
申请号 |
US19920947948 |
申请日期 |
1992.09.21 |
申请人 |
SUMITOMO METAL MINING CO., LTD. |
发明人 |
ITO, SENTARO;SHIMIZU, TOSHINORI |
分类号 |
G01M3/28;G01M3/34 |
主分类号 |
G01M3/28 |
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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