Device for forming a closed chamber inside two metal pipes to be connected together by arc welding under a protective gas
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United States of America Patent
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Jun 5, 1990
Grant Date -
N/A
app pub date -
Mar 30, 1989
filing date -
Mar 31, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for forming a closed chamber inside a set of two metal pieces of pipework (1) to be interconnected by arc welding under a protective gas, the device comprising a first hollow element made of elastomer disposed inside the first piece of pipework and a second hollow element made of elastomer disposed inside the second piece of pipework, both hollow elements being inflatable to close the corresponding piece of pipework. Each of the hollow elastomer elements comprises a toroidal inflatable tube (2) having a disk (3) fixed to the internal equatorial meridian thereof by gluing, said disk withstanding the pressure difference between the ambient atmosphere and the desired internal pressure inside the closed chamber, said disk being of a proper diameter necessary to cause the zone of the inflatable tube adjacent to said internal equatorial meridian to be concave.
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