US3917148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding tip
Assignee: Technical Devices Inc
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Filing: 1973-10-19
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Granted: 1975-11-04
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Expires: 1993-10-19
Abstract
Abstract A weld tip for use is capillary bonding welding for electronic components includes a structural body member having a conically tapered end which forms the welding tip. A bore is provided in axial alignment with the center axis of the body member, the portion of the bore in the region of the tip forming the welding end being frusto-conical in shape, i.e., tapered with respect to the central axis, while the other end of the bonding tip includes a generally cylindrical bore. Positioned between the cylindrical bore and the tapered bore at the tip end is a second tapered bore, the latter being tapered to a greater degree than the bore at the tip end of the tool. The tip is formed by a chemical vapor deposition procedure utilizing an improved mandrel of a predetermined configuration such that preselected openings may be provided in the free end of the welding tip by cutting at preselected points along the axis of the mandrel. Thus, one mandrel may be used to provide welding tips having apertures in the working end thereof of different diameters. Typical materials which may be used as the structural material are tungsten, rhenium, molybdenum, and alloys thereof, tantalum carbide and columbium carbide, the preferred material being an alloy of tungsten and carbon wherein the carbon is present in an amount of between 0.40% and 0.50% by weight.
Inventors
- 👤 Robert C Runyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:28
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/002; B23K20/004; B23K20/005; B23K2101/00; B23K2101/36; H; H10; H10W; H10W72/00; H10W72/071; H10W72/0711; H10W72/07141; H10W72/075; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/5524; H10W72/5525
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
A capillary bonding tip for use as a welding tool for electronic components wherein the tip is subjected to heat during use and wherein a metallic member is advanced through the tip comprising: means forming a body member, said body member terminating in an end face defining the welding surface of said tip, said body member including surface means defining a bore in axial alignment with the center axis of said body member, said bore including a portion extending to the end face of said body member having walls tapered at a predetermined angle to a minimum transverse dimension at said end face, and said bore in the portion of said body member forming said end face being of capillary dimensions.
Claim 2
Dependent Claim
121 words
A capillary bonding tip for use as a welding tool for electronic components wherein the tip is subjected to heat during use and wherein a metallic member is advanced through the tip comprising: means forming a body member, said body member terminating in an end face defining the welding surface of said tip, said body member including surface means defining a bore in axial alignment with the center axis of said body member, said bore including a portion extending to the end face of said body member having walls tapered at a predetermined angle to a minimum transverse dimension at said end face, and said bore in the portion of said body member forming said end face being of capillary dimensions.
Claim 3
Dependent Claim
49 words
A capillary bonding tip as set forth in claim 1 wherein the dimension of the bore at said portion thereof extending to said end face gradually increases from a minimum at the open end thereof at said end face to a maximum at the end opposite said welding surface.
Claim 4
Dependent Claim
63 words
A bonding tip as set forth in claim 1 wherein said bore includes a generally cylindrical bore portion at a portion thereof remove from said end face, said bore including a second tapered portion between said cylindrical portion and said portion extending to said end face, and said second tapered portion having walls that taper at an angle greater than said predetermined angle.
Claim 5
Dependent Claim
29 words
A bonding tip as set forth in claim 1 wherein the bore in the portion of said end face is of a dimension of between 0.0007 and 0.010 inches.
Claim 6
Dependent Claim
21 words
A bonding tip as set forth in claim 1 wherein said body member is of an alloy of tungsten and carbon.
Claim 7
Dependent Claim
39 words
A bonding tip as set forth in claim 1 wherein said predetermined angle is such that for each change axially in the length of 0.001 inches in the welding tip the diameter of the bore changes approximately. .000087 inches.
Claim 8
Dependent Claim
21 words
A bonding tip as set forth in claim 1 wherein said body member is composed of an acid resistant structural material.
Claim 9
Dependent Claim
31 words
A bonding tip as set forth in claim 7 wherein said structural material is selected from the group consisting of tungsten, rhenium, molybdenum, and alloys thereof, tantalum carbide and columbium carbide.
Claim 10
Dependent Claim
17 words
A bonding tip as set forth in claim 8 wherein said structural material is chemically vapor deposited.
Claim 11
Dependent Claim
15 words
A bonding tip as set forth in claim 3 wherein said predetermined angle is 5*.
Claim 12
Dependent Claim
20 words
A bonding tip as set forth in claim 3 wherein the angle of taper of said second portion is 16*.
Claim 13
Dependent Claim
49 words
A capillary bonding tip as set forth in claim 1 wherein said body member is formed of a material having a Vickers hardness of at least 1,800, a transverse rupture (bend) strength of at least about 500,000 psi and a compressive yield of at least about 2, 000,000 psi.
Claim 14
Dependent Claim
113 words
A capillary bonding tip for use as a welding tool for electronic components comprising: means forming a structural body member, means in said body member defining a bore in axial alignment with said body member, said body terminating in an end face defining the working face of said tip, the portion of said bore at the working face of said tip having an opening therein of capillary dimensions, said bore tapering in transverse dimension to said working face from a location remoTe therefrom, and said structural body member being a chemically vapor deposited alloy of tungsten and carbon wherein said carbon is present in an amount by weight of between 0.40% and 0.50%.
Claim 15
Dependent Claim
113 words
A capillary bonding tip for use as a welding tool for electronic components comprising: means forming a structural body member, means in said body member defining a bore in axial alignment with said body member, said body terminating in an end face defining the working face of said tip, the portion of said bore at the working face of said tip having an opening therein of capillary dimensions, said bore tapering in transverse dimension to said working face from a location remoTe therefrom, and said structural body member being a chemically vapor deposited alloy of tungsten and carbon wherein said carbon is present in an amount by weight of between 0.40% and 0.50%.
Claim 16
Dependent Claim
26 words
A capillary bonding tip as set forth in claim 13 wherein the portion of said bore adjacent to said working face is generally frusto-conical in cross-section.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |