| 摘要 |
A multiple-filler-material guide nozzle assembly (12A) for feeding multiple fusible filler metal wires (10a, 10b) or other metal forms into reduced-width, high-aspect-ratio (ratio of depth to width) metallic joints (2) with control and stability of the filler metal position as it enters the molten pool area. The multiple filler materials are fed concurrently at the same or different feed rates. To control the aiming consistency for each of the multiple fillers even with substantial amounts of "cast" in the filler shape (after being unwound from a spool), the nozzle holes can be curved to match the curvature of the "cast" filler wire. This forces the curved filler wire to consistently follow the predetermined orientation of the curved shape of the nozzle. The multiple nozzles can be used to compensate for weld dilution effects by alloying to generate more favorable uniform, gradient or stepped compositions in joints or cladding. These various composition configurations can be achieved by feeding variable rates of two or more different alloys into the joint. The multiple nozzles can also be used to deliver additives to the weld pool, such as powders for alloying effects including in-situ alloying with noble metal catalytic elements (e.g, palladium) or enrichment with SCC-resistant elements (e.g., chromium). <IMAGE> |
