| 20090230109 | EQUIPMENT AND PROCESS FOR APPLYING AN EXTERNAL STRUCTURAL WELD TO PIPING AND SIMILARLY SHAPED PRESSURE BOUNDARY COMPONENTS - An apparatus and/or process for applying a weld overlay to a nozzle or piping spool of complex configuration is disclosed. In an exemplary embodiment, the welding apparatus comprises a mounting assembly having a plurality of magnetic foot pads, a tension support rod attached at one end to one of the magnetic foot pads, an upper attachment pad at the opposite end of the rod, and a bottom attachment pad attached to at least one other magnetic foot pad; a travel guide, the travel guide attached to the upper attachment pad at one end and the bottom attachment pad at the other end; and a head assembly attached to the travel guide, the head assembly having: i) a track ring assembly having an inner ring and an outer ring, ii) at least two opposed weld heads attached to the inner track ring, iii) at least one movable wire feed drive mechanism on the track ring, and iv) a drive mechanism located on the outer ring of the track ring, the drive mechanism adapted to permit rotation of the inner ring and the weld heads around the component to be welded. | 09-17-2009 |
| 20080230155 | PROCESS AND METHOD TO INCREASE THE HARDNESS OF Fe-Cr-C WELD OVERLAY ALLOY - A method of preparing a mechanical component with an Fe—Cr—C hardfacing weld overlay alloy for improving the resistance of the mechanical component to abrasion, erosion or erosion/corrosion for use in very abrasive, erosion or erosive/corrosive environments by significantly increasing the hardness of the weld overlay is disclosed. To improve the resistance to abrasion, erosion or corrosion, a weld overlay of a Fe—Cr—C hardfacing alloy is applied onto the surface of a metallic component, such as tubes, pipes, or vessels. Welding and cladding methods including gas-metal-arc welding (GMAW), gas-tungsten-arc welding (GTAW), and laser cladding may be utilized. Then, the component is heat-treated at elevated temperatures for a sufficient time, resulting in additional hardening and thus further increasing the weld overlay's resistance to abrasion, erosion, or erosion/corrosion. | 09-25-2008 |
