Preparation of filler-metal weld rod by injection molding of powder

Inactive Publication Date: 2006-02-02
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] The present approach provides a convenient and economical approach to producing filler-metal weld rod. Filler-metal weld rod of any composition that is available in powder form may be made, even of difficult-to-draw metals such as high-gamma prime nickel-base superalloys and intermetallics. Compositional control of the weld rod is highly precise

Problems solved by technology

Otherwise, some alloying is required during the processing or the use of the weld rod in a welding procedure, and t

Method used

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  • Preparation of filler-metal weld rod by injection molding of powder
  • Preparation of filler-metal weld rod by injection molding of powder
  • Preparation of filler-metal weld rod by injection molding of powder

Examples

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Example

[0020]FIG. 1 depicts the steps in a method for preparing a filler-metal weld rod of a filler-metal composition. A mass of metallic powders is provided, step 20. The mass of metallic powders taken together have the filler-metal composition. The metallic powders are preferably prealloyed. That is, each powder particle has the net filler-metal composition as to metallic elements. Prealloyed metallic powders for compositions of interest are available commercially, or can be prepared specially by known techniques. The metallic powder particles may instead be of different compositions, but selected so that the net composition of all of the metallic powder particles taken together is the filler-metal composition of interest.

[0021] The present approach is operable to produce any of a wide range of filler-metal compositions. As long as prealloyed powders or powders who compositions can be combined to define a composition of interest are available, the present approach may be utilized. Howev...

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Abstract

A filler-metal weld rod of a filler-metal composition is prepared by providing a mass of metallic powders, mixing the metallic powders with a temporary thermoplastic binder to form an injection-moldable mixture, and thereafter injection molding the injection-moldable mixture at an injection-molding temperature above the thermoplastic temperature of the thermoplastic binder to form an injection-molded rod. Any excess thermoplastic binder is removed from the injection-molded rod, and the injection-molded rod is thereafter sintered to form a filler-metal weld rod, with the temporary thermoplastic binder removed in the step of sintering.

Description

[0001] This invention relates to the preparation of filler-metal weld rod and, more particularly, to the preparation of weld rod of difficult-to-deform alloys. SUMMARY OF THE INVENTION [0002] In a form of welding, a metallic article to be welded is locally melted, and the melted metal is mixed with a second metal. The temperature is thereafter reduced so that the melted mixture solidifies. In one approach, the second metal is another article, so that the two articles are joined together. In another approach, the second metal is an overlay deposit that is also melted during the welding process, with the result that the first article is overlaid with the second metal. [0003] A filler metal may be used in either of these approaches. In the joining of two articles by welding, the filler metal may be added into the melted zone to fill the space between the two articles. In the overlay process, the filler metal may form substantially the entire overlay. The filler metal may be the same as...

Claims

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Application Information

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IPC IPC(8): B22F3/10
CPCB22F3/225B22F2998/00B22F2998/10B23K35/3033B23K35/304B23K35/3086B23K35/325B23K35/40B22F1/0003B22F3/1021B22F3/15B22F1/00
Inventor KELLY, THOMAS JOSEPH
Owner GENERAL ELECTRIC CO
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