WELDING METHOD OF A FIRST TO A SECOND TUBULAR, THE TUBULARS COMPRISING A CORROSION RESISTANT ALLOY ON AN INTERNAL FACE THEREOF
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United States of America Patent
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Issued Date -
May 30, 2013
app pub date -
Apr 26, 2011
filing date -
Apr 26, 2010
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Abstract
A method of butt welding a first and second tubular to join them together, the tubulars being suitable for use in an underwater environment and normally being made from carbon steel and having a corrosion resistant alloy (CRA) provided on an internal face thereof, the method comprising: depositing from an external side of the first and second tubulars, a weld-filler material onto a butt joint between the first and second tubulars. Preferably the weld filler on the external side is a carbon steel weld filler and for the internal side is a CRA weld filler. In this manner sufficiently strong circumferential welds may be provided especially for CRA clad tubulars. A method of deploying the tubulars underwater and an apparatus comprising tubulars welded together is also disclosed.
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