Abstract:
A purge dam assembly confines a volume within an assembly of pipes, including a distal pipe and a proximal pipe together arranged for butt welding at a seam. A distal disk is covered at its periphery with a distal bootie including gasketing material. A proximal disk is covered at its periphery with a proximal bootie including the gasketing material. The each disk is sized such that the bootie contacts but does not completely seal against an inner surface of one of the tubes or pipes permitting a purging flow of gas from the volume and past each disk. A cross-member having a proximal and a distal end, the proximal end is affixed to the proximal disk and the distal end is affixed to the distal disk to preserve the spatial separation between the proximal disk and distal disks and to maintain the proximal and distal disks in coaxial alignment.
Abstract:
The example methods and apparatus reduce and/or eliminate adverse effects of welding work pieces having dissimilar compositions. An example method includes depositing a first weld layer (106) on a first end of a first work piece (102). The first work piece has a first content of a metallic element and the first weld layer has a second content of the metallic element higher than the first content. The example method includes depositing a second weld layer (108) between the first weld layer and a second end of a second work piece (104) to couple the first work piece to the second work piece. The second weld layer has a third content of the metallic element higher than the second content, and the second work piece has a fourth content of the metallic element higher than the first content.
Abstract:
The present disclosure generally relates to methods for additive manufacturing (AM) that utilize support leading edge structures (210) in the process of building objects (200), as well as novel leading edge support structures (210) to be used within these AM processes. The support structure (210) is positioned adjacent the object between the object and a first side of the powder bed. The support structure (210) has a shape that tapers outward in the direction from the first side to the object
Abstract:
The invention relates to an alignment means (60) for a profiling line. The alignment means (60) is structured for aligning two edges of the item (P) on which a welding must be performed by welding means (4).