METHOD AND SYSTEM FOR WELDING CONDUITS

摘要

A method for welding two or more conduits includes aligning end portions thereof in an abutting relationship to define a gap. The method includes performing a spatter free root weld along the gap to configure a root layer while the inner circumferential surface side is unobstructed. After the root weld is complete, an outward thrust is applied along the inner circumferential surfaces of the conduits. During the application of the outward thrust, a filler weld is performed along the gap to fill the gap and to facilitate shrinkage of the filler and root weld materials longitudinally and radially outward while preventing pressing out of the filler and root weld materials radially inward of the inner circumferential surface.

主权项

1. A method for welding two or more conduit members, the method comprising:
aligning two or more end portions of the two or more conduit members in an abutting relationship to define a gap, the conduit members having an outer circumferential surface side and an inner circumferential surface side; having the inner circumferential surface side unobstructed; performing a root weld along the gap from the outer circumferential surface side to configure a root layer while the inner circumferential surface side is unobstructed, the root weld being performed in a manner that prevents spattering of the root weld material along the inner circumferential surface side; after the root weld is complete, applying an outward thrust along the inner circumferential surface side; and during application of the outward thrust, performing a filler weld along the gap from the outer circumferential surface side thereof to fill the gap so as to facilitate shrinkage of the filler and root weld materials longitudinally and radially outwardly while preventing pressing out of the filler and root weld materials radially inwardly of the inner circumferential surface side.