David H Workman

US Patent:

6545244, Apr 8, 2003

Filed:

Aug 27, 2001

Appl. No.:

09/940390

Inventors:

Jerry E. Gould - Columbus OH
Lawrence R. Lehman - Columbus OH
David P. Workman - Dublin OH

Assignee:

Edison Welding Institute - Columbus OH

International Classification:

B23K 1106

US Classification:

219118, 219119, 219 82, 219 83

Abstract:

A welding arrangement comprises first and second parts to be welded with an edge portion of the first part and an edge portion of the second part juxtaposed to form a weld zone. An electrically-conductive sheet(s) with a higher melting temperature than a melting temperature of the first and second parts are placed over the weld zone and a force application device is used to apply a lateral compressive force to the weld zone. First and second electrodes are placed in contact with the electrically conductive sheet(s) which are resistively heated and in turn conductively heat the weld zone.

US Patent:

7126076, Oct 24, 2006

Filed:

Feb 5, 2004

Appl. No.:

10/772701

Inventors:

David P. Workman - Dublin OH, US
Timothy J. Trapp - Upper Arlington OH, US
Jerry E. Gould - Grandview Heights OH, US

Assignee:

Edison Welding Institute, Inc. - Columbus OH

International Classification:

B23K 11/00

US Classification:

2191171, 228119

Abstract:

A method for repairing defects in a metallic substrate including the steps of placing a consumable filler slug in contact with the substrate in the vicinity of the defect; bringing a first electrode and a second electrode in contact with the consumable slug and applying a pressure to the consumable slug; and transmitting electrical current between the electrodes for a period, thereby resistively heating the consumable slug and the metallic substrate resulting in coalescence in a substantially liquid pool that fills the defect. The pool is then cooled to solidification under the pressure of the electrodes. The electrodes are then removed from contact with the consumable slug and excess material may be removed. The consumable slug may be formed as a single unit or multiple sections, and may incorporate sacrificial retainers to add additional defect filling material, retain the pool, and seal the pool from atmosphere.

US Patent:

7141754, Nov 28, 2006

Filed:

Nov 5, 2004

Appl. No.:

10/983154

Inventors:

David Page Workman - Dublin OH, US
Timothy Joseph Trapp - Upper Arlington OH, US
Jerry Ellison Gould - Grandview Heights OH, US

Assignee:

Edison Welding Institute, Inc. - Columbus OH

International Classification:

B23K 11/00

US Classification:

2191171, 228119

Abstract:

A method for repairing defects in a substrate including the steps of placing a consumable filler slug in contact with the substrate in the vicinity of the defect; placing at least one electrically conductive cover sheet in contact with a portion of the consumable filler slug; bringing a first electrode and a second electrode in contact with the at least one cover sheet and applying a force; and transmitting electrical current between the electrodes, thereby resistively heating the at least one cover sheet and conductively heating the consumable slug and a portion of the substrate resulting in coalescence in a substantially liquid pool that fills the defect. The pool is then cooled to solidification under pressure. Alternative embodiments eliminate the need for the conductive cover sheet(s) by utilizing electrodes having increased electrical and thermal resistance. The consumable slug may be formed as a single unit or multiple sections, and may incorporate sacrificial retainers.

US Patent:

7467741, Dec 23, 2008

Filed:

Oct 21, 2003

Appl. No.:

10/689771

Inventors:

David P. Workman - Dublin OH, US

Assignee:

Cabot Corporation - Boston MA

International Classification:

C23C 14/34
B23K 20/12

US Classification:

228114, 2281121, 228115, 228116, 228136, 228164, 228166, 228167, 228168, 228171, 2281732, 228165, 228193, 228194, 228195, 20429812, 20419813

Abstract:

A method of forming a sputtering target assembly and the sputtering target assembly made therefrom are described. The method includes bonding a sputtering target to a backing plate at a low temperature. Also described is a method of forming a sputtering target assembly such that a gap is formed between the sputtering target and the backing plate. Also described is a method of forming a sputtering target assembly providing a mechanism to prevent unintended sputtering into the backing plate.

US Patent:

20090250439, Oct 8, 2009

Filed:

Mar 27, 2009

Appl. No.:

12/412685

Inventors:

DAVID WORKMAN - Dublin OH, US
Fabian Orth - Hilliard OH, US
Timothy Stotler - Columbus OH, US

International Classification:

B23K 11/00

US Classification:

219 7802, 2191171

Abstract:

A method for forming a clad structure utilizing a moving resistance energy source. The method forms a metallurgical bond between a cladding layer and a primary layer such that at least 2% of a cladding layer surface is metallurgically fusion bonded to a primary layer surface. The fusion bond does not extend all the way through the primary layer or the cladding layer. Either, or both, of the layers may incorporate surface texturing to reduce the contact area between the layers, and melting point suppressants may be incorporated into the method.

US Patent:

20140061282, Mar 6, 2014

Filed:

Jan 3, 2013

Appl. No.:

13/733273

Inventors:

David P. Workman - Dublin OH, US

Assignee:

EDISON WELDING INSTITUTE, INC. - Columbus OH

International Classification:

B23K 20/12

US Classification:

228 21

Abstract:

A system for joining materials such as metal alloys that includes a first component, wherein the first component includes a first alloy having a known austenization temperature below which martensite forms when the component is heated and then cooled at a predetermined rate of cooling; a second component, wherein the second component includes a second alloy; and a welding apparatus operative to create a weld between the first and second components without crossing the austenization temperature of the first alloy.

US Patent:

62814672, Aug 28, 2001

Filed:

Mar 14, 2000

Appl. No.:

9/508708

Inventors:

Jerry E. Gould - Columbus OH
Lawrence R. Lehman - Columbus OH
David P. Workman - Dublin OH

Assignee:

Edison Welding Institute - Columbus OH

International Classification:

B23K 1106
B23K 1130
B23K 1136

US Classification:

219118

Abstract:

A welding arrangement (10) consists of first and second parts to be welded (4a, 4b) with a portion of the first part and a portion of the second part juxtaposed to form a weld zone (8a, 8b). An electrically-conductive sheet (2) with a higher melting temperature than a melting temperature of the first part (4a) and a melting temperature of the second part (4b) is placed over the weld zone (8a, 8b). A first electrode (12) is placed in contact with the electrically conductive sheet material (2) and a second electrode (14) is positioned and aligned with the first electrode (12) to heat conducively the weld zone (8a, 8b) with an electrical current. For the butt weld configuration (10), a second electrically conductive sheet (6) is placed between the second electrode (14) and the weld zone (8a, 8b).

US Patent:

20200108468, Apr 9, 2020

Filed:

Oct 7, 2019

Appl. No.:

16/594904

Inventors:

- Columbus OH, US
Tim Frech - Columbus OH, US
Matthew A. Short - Wilmington OH, US
Jerry Gould - Grandview Heights OH, US
David Workman - Dublin OH, US
Lindsey Lindamood - Grandview Heights OH, US

International Classification:

B23K 28/02
B23K 20/10
B23K 11/11

Abstract:

A hybrid welding system, comprising a first welding system, wherein the first welding system includes an ultrasonic spot-welding system, and wherein the ultrasonic spot-welding system further includes at least one sonotrode for delivering ultrasonic vibration to a predetermined weld location; and a second welding system, wherein the second welding system includes a resistance spot welding system that functions simultaneously with the ultrasonic spot-welding system, and wherein the resistance spot welding system further includes at least one electrode that is configured to direct electrical current into the predetermined weld location.