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US 2009/0212023 A1Published application
Welding Processes
AssigneeFluor Technologies Corporation
InventorsBarry Messer, Shawn Seitz, Kenneth E. Armstrong, Charles Patrick
Life of this patent
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Abstract
Contemplated methods for welding stainless steel substantially improve welding speed and quality. Most typically, such attributes are achieved by welding a root pass using GMAW-Sm to thereby depositing a root, welding a hot pass using GMAW-P to thereby deposit additional weld metal onto the root, and by welding at least one of a fill pass and a cap pass using at least one of GMAW-P and FCAW.
Claims17
A method of welding austenitic steel pipes, comprising:
- welding a root pass using GMAW-Sm to thereby depositing a root;
- welding a hot pass onto the root using GMAW-P to thereby deposit additional weld metal onto the root;
- and
- welding at least one of a fill pass and a cap pass using at least one of GMAW-P and FCAW.
1 more element
A method of welding stainless steel, comprising the steps of:
- depositing a root without backing gas to provide a chemically stabilized weld using a high-frequency current-controlled power supply in short circuiting welding mode;
- depositing a filler metal onto the root using a heat input of less than 0.85 kJ/mm;
- and
- depositing additional metal onto the filler metal using at least one of GMAW-P and FCAW.
1 more element
Dependencies are inferred from the claim text.