process for energy beam solid-state metallurgical bonding of wires having two or more flat surfaces

• US 20100155374A1
• Filed: 11/04/2009
• Published: 06/24/2010
• Est. Priority Date: 11/04/2008
• Status: Active Grant

• Current Assignee: Joshua E. Rabinovich
• Original Assignee: Joshua E. Rabinovich
• Inventors: Rabinovich, Joshua E.
• Granted Patent: US 8,334,475 B2
• Time in Patent Office: Days
• US Class Current: 219/121.140
• CPC Class Codes: B23K 15/0086 welding for purposes other than joining, e.g. built-up welding
• CPC Class Codes: B23K 26/0622 by shaping pulses
• CPC Class Codes: B23K 26/34 Laser welding for purposes other than joining
• CPC Class Codes: B23K 26/342 Build-up welding
• CPC Class Codes: B23K 35/0227 Rods, wires B23K35/0244 takes precedence
• CPC Class Codes: B23K 35/0244 Powders, particles or spheres; Preforms made therefrom
• CPC Class Codes: B23K 35/0255 for use in welding B23K35/0205 takes precedence
• CPC Class Codes: B23K 35/0261 Rods, electrodes, wires
• CPC Class Codes: B23K 35/0272 with more than one layer of coating or sheathing material
• CPC Class Codes: B23K 35/325 Ti as the principal constituent
• CPC Class Codes: B23K 35/38 Selection of media, e.g. special atmospheres for surrounding the working area
• CPC Class Codes: B23K 35/383 mainly containing noble gases or nitrogen
• CPC Class Codes: B33Y 30/00 Apparatus for additive manufacturing; Details thereof or accessories therefor

Abstract

An energy beam assisted solid-state welding welds a wire material to a substrate. A wire of coating or repairing material is placed in contact with a surface or surfaces of a substrate. A beam is directed into an outer flat surface of the wire, which heats the wire through flat outer surface of the wire with beam energy. Beam energy produces compression stress-waves that drive molecules of the material flat wire into a surface of the substrate, joining the material and the substrate with strong wave shaped interfaces.

Claims

1. A process and apparatus for energy beam assisted solid-state metallurgical bonding of a wire, having two or more flat surfaces, to a substrate, for the purpose of substrate coating, 3-Dimensional component buildup, restoration and component surface improvement, and comprising the steps of:

applying of a continuously fed wire to a substrate such that the bottom of the wire flat surface(s) are tangential to the substrate such that the contact of the wire with the substrate constitute substantially a surface(s);

an energy beam (for example Laser or Electron Beam) is simultaneously applied to the wire, with a magnitude controlled to be sufficient to produce a sudden compressive shock wave and heat at the surface of the wire to propagate through the wire and the top surface of the substrate;

whilst some material particles of the wire are carried with the shock wave and are penetrating (forged-in) into the substrate, producing a strong metallurgical bond without substantial liquefaction of the substrate (solid-state bonding)

2. The process and apparatus of claim 1 further including a means of controlling energy beam and its energy and power densities to achieve various magnitudes of the compressive shock wave at the top surface of the wire.

5. The process and apparatus of claim 1 further including a wire delivery means to continuously delivering the wire onto the substrate such that the contact of the wire with the substrate constitute substantially a surface(s) to provide a good coupling of wire and substrate for an effective transportation of thermal-wave and the shock-wave carrying the wire particles into the substrate.

6. The process and apparatus of claim 1 further including a means for adjusting the energy beam size appropriate to the wire width or to the desired fraction of the wire width.

7. The process and apparatus of claim 1 further including a means for scanning energy beam across the wire width for the purposes of wire deposition and cutting.

8. The process and apparatus of claim 1 further including a means of delivery of inert gas into the area of energy beam impingement with the wire to prevent the bonding from being effected or contaminated by the surrounding atmosphere. The process can be also conducted in a vacuum.

9. The process and apparatus of claim 1 further including a means for a flat or 3-Dimensional component manipulation in 3-Dimensional space pivoted about the point, which belongs to the normal to the component'"'"'s surface at the meeting point of the energy beam and the wire with the component'"'"'s surface.

10. The process and apparatus of claim 1 wherein the wire material can be of any metal material available (or can be made available) in the desired wire form, and non metal material in the strip or tow form.

11. The process and apparatus of claim 1 wherein the substrate material can be of any metal material and non metal material.

12. The process and apparatus of claim 1 wherein plurality of combinations of similar or dissimilar materials of wire and substrate can be used.

13. A component produced, built-up or coated with a layer or layers of materials in accordance with the process and apparatus of claim 1.

3. The process and apparatus of clam 1 further including a means of controlling energy beam and its energy and power densities and pulse duration to achieve various temperature gradients through the wire material and the top layer of the substrate material to produce the desired amount of penetration of wire material into (forge-in depth) the substrate material.

4. The process and apparatus of clam 1, further including a means of controlling energy beam'"'"'s power and energy densities and pulse time duration to achieve the required temperature gradient through the wire. It is controlled such that, while the part of the top surface of the flat wire is liquefied, the surface of the wire adjacent to the substrate can be maintained in a solid or semisolid state at the temperatures below the liquefaction temperature of the substrate material.