Process for bonding workpieces

• US 6,291,806 B1
• Filed: 09/30/1999
• Issued: 09/18/2001
• Est. Priority Date: 10/01/1998
• Status: Expired due to Fees

• Current Assignee: USF Filtration and Separations Group, Inc. (Siemens AG)
• Original Assignee: USF Filtration and Separations Group, Inc. (Siemens AG)
• Inventors: Li, Tao, Quick, Nathaniel R., Malanga, Robert
• Primary Examiner(s): Leung, Philip H.
• Application Number:
  US09/408,749
• Time in Patent Office: 719 Days
• Field of Search: 219/633, 219/603, 219/634, 219/635, 219/78.01, 219/85.12, 228/121, 228/122.1, 228/175, 228/190, 228/193, 228/227, 228/228, 228/229, 228/230, 228/124.6, 210/493.5, 210/493.2, 419/2, 419/4, 419/48, 392/417, 392/418
• US Class Current: 219/633
• CPC Class Codes: B01D 29/012 Making filtering elements making bag, cage, hose, tube, sleeve or like filtering elements B01D29/111
• CPC Class Codes: B01D 29/05 supported
• CPC Class Codes: B01D 39/2048 otherwise bonded
• CPC Class Codes: B23K 20/023 Thermo-compression bonding

Abstract

The process of bonding a first workpiece to a second workpiece is disclosed comprising the steps of fabricating a sintered bonding pad formed from a matrix of randomly oriented metallic fibers. The bonding pad is interposed between the first and the second workpiece and the first and second workpieces are biased into engagement with the bonding pad. Heat is applied to the first workpiece to the second workpiece for transforming substantially all of the metallic fibers into a liquid for bonding the first workpiece to the second workpiece.

Claims

1. The process of bonding a first workpiece to a second workpiece, comprising the steps of:

fabricating a porous bonding pad from a matrix of randomly oriented metallic fibers;

sintering the porous bonding pad for affixing each of the metallic fibers to adjacent metallic fibers;

interposing the bonding pad between the first and the second workpiece;

biasing the first and second workpieces into engagement with the bonding pad; and

applying heat to the first workpiece to the second workpiece for transforming substantially all of the metallic fibers into a liquid for bonding the first workpiece to the second workpiece.

2. The process of bonding a first workpiece to a second workpiece as set forth in claim 1, wherein the step of fabricating the bonding pad comprises drawing metallic fibers in a wire drawing process to provide a uniform diameter thereof;

and

forming a matrix of randomly oriented metallic fibers to provide the porous bonding pad.

3. The process of bonding a first workpiece to a second workpiece as set forth in claim 1, wherein the step of applying heat includes directing heat between the first and second workpiece.

4. The process of bonding a first workpiece to a second workpiece as set forth in claim 1, wherein the step of applying heat includes concentrating heat between the first and second workpiece.

5. The process of bonding a first workpiece to a second workpiece as set forth in claim 1, wherein the step of applying heat includes directing infrared radiation between the first and second workpiece.

6. The process of bonding a first workpiece to a second workpiece as set forth in claim 1, wherein the step of applying heat includes applying heat in a hydrogen atmosphere for melting at least the surface of each of the metallic bonding fibers.

7. The process of bonding a first workpiece to a second workpiece, comprising the steps of:

fabricating a porous bonding pad from a matrix of randomly oriented metallic fibers;

sintering the porous bonding pad for affixing each of the metallic fibers to adjacent metallic fibers;

interposing the bonding pad between the first and the second workpiece;

biasing the first and second workpieces into engagement with the bonding pad; and

applying heat to the first workpiece to the second workpiece for transforming substantially all of the metallic fibers into a liquid for bonding the first workpiece to the second workpiece upon solidification of the liquefied metallic fibers.

8. The process of bonding a first workpiece to a second workpiece as set forth in claim 7, wherein the step of fabricating the porous bonding pad includes drawing a metallic wire to provide a metallic fiber having a cylindrical diameter less than 50 micrometers;

and

fabricating the porous bonding pad from a matrix of randomly oriented metallic fibers.

9. The process of bonding a first workpiece to a second workpiece as set forth in claim 7, wherein the step of fabricating the porous bonding pad includes drawing a metallic wire to provide a metallic fiber having a cylindrical diameter less than 50 micrometers;

and

fabricating the porous bonding pad from a matrix of randomly oriented metallic fibers to provide a resilient bonding pad.

10. The process of bonding a first workpiece to a second workpiece as set forth in claim 7, wherein the step of applying heat includes directing heat between the first and second workpiece.

11. The process of bonding a first workpiece to a second workpiece as set forth in claim 7, wherein the step of applying heat includes concentrating heat between the first and second workpiece.

12. The process of bonding a first workpiece to a second workpiece as set forth in claim 7, wherein the step of applying heat includes directing infrared radiation between the first and second workpiece.

13. The process of bonding a first workpiece to a second workpiece as set forth in claim 7, wherein the step of applying heat includes applying heat in a hydrogen atmosphere for melting at least the surface of each of the metallic bonding fibers.