Pipe welding process using a metallic insert for improved corrosion resistance of the welded zone
First Claim
1. A process to improve corrosion resistance of a welded bead area created by the welding of two tubings by providing an improved corrosion resistance of the welded zone against corrosive fluids, said tubings being made of stainless steel comprising manganese, wherein said process comprises the steps of providing an insert body made of manganese poor corrosion resistant metal, introducing said insert body partially into the end of each tubing to be welded and welding said tubings in order to provide an internal layer of corrosion resistant material between the two tubings and reduce the manganese fumes emission from the stainless steel tubes to be welded.
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Accused Products
Abstract
Avoidance of the corrosion initiation sites consisting of Mn particles deposited on the TiG welded inner tube surface is achieved through suppression of emission of manganese fumes by addition of a protective non corrosive metallic layer. The latter melts during the welding and arises in a non-corrosive internal metallic coating of the welded zone.
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Citations
11 Claims
- 1. A process to improve corrosion resistance of a welded bead area created by the welding of two tubings by providing an improved corrosion resistance of the welded zone against corrosive fluids, said tubings being made of stainless steel comprising manganese, wherein said process comprises the steps of providing an insert body made of manganese poor corrosion resistant metal, introducing said insert body partially into the end of each tubing to be welded and welding said tubings in order to provide an internal layer of corrosion resistant material between the two tubings and reduce the manganese fumes emission from the stainless steel tubes to be welded.
Specification