US4959519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled pressure butt welding process and apparatus for carrying it out
Assignee: Meyer Roth and Pastor Maschinenfabrik GmbH
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Filing: 1989-02-23
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Granted: 1990-09-25
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Expires: 2009-02-23
Abstract
Abstract In a pressure butt welding process, in particular for welding chain link bent from round wire, the influence of disturbing factors on the quality of the welding result is compensated by measuring the welding forces F K exerted on the workpiece by the upsetting dies and setting and welding voltage applied to the workpiece according to the level of the measured forces F K . A control means adjusts the welding voltage via a thyristor control circuit and thereby the effective welding power in such a way that the welding forces F K remain constant.
Inventors
- 👤 Karl-Christoph Exner
- 👤 Franz Reichow
- 👤 Horst Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:01
CPC Classifications
B; B21; B21L; B21L3/00; B21L3/02; B23; B23K; B23K11/00; B23K11/02; B23K11/24; B23K11/241; B23K11/246; B23K11/25; B23K11/252; B23K11/255; B23K2101/00; B23K2101/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A pressure butt welding process for welding chain links bent from round wire, comprising the steps of: pressing together areas of a workpiece to be welded with upsetting dies which are moved in a controlled manner by continuous cam disks; measuring pressure forces exerted on the workpiece areas by the upsetting dies; applying a welding voltage to the workpiece; and continuously adjusting the welding voltage as a function of the measured pressure forces.
Claim 2
Dependent Claim
73 words
A pressure butt welding process for welding chain links bent from round wire, comprising the steps of: pressing together areas of a workpiece to be welded with upsetting dies which are moved in a controlled manner by continuous cam disks; measuring pressure forces exerted on the workpiece areas by the upsetting dies; applying a welding voltage to the workpiece; and continuously adjusting the welding voltage as a function of the measured pressure forces.
Claim 3
Dependent Claim
35 words
A process according to claim 1, wherein the welding voltage is an alternating-current voltage, the adjusting step including adjusting the welding voltage depending on the measured pressure forces according to a phase angle control principle.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein the welding voltage applying step includes applying the welding voltage to the workpiece only when the measured pressure forces exceed a threshold value.
Claim 5
Dependent Claim
30 words
A process according to claim 3, wherein the welding voltage applying step includes a preset heating-up period, the pressing together step starting after the end of the preset heating-up period.
Claim 6
Dependent Claim
30 words
A process according to claim 3, wherein the welding voltage applying step includes a preset heating-up period, the pressing together step starting after the end of the preset heating-up period.
Claim 7
Dependent Claim
40 words
A process according to claim 1, wherein the welding voltage adjusting step includes adjusting the welding voltage by control means so that the pressure forces exerted on the workpiece in its longitudinal direction are kept constant at an intended value.
Claim 8
Independent Claim
175 words
An apparatus for butt welding of chain links bent from round wire, comprising: means for pressing together areas of a workpiece to be welded, said pressing means including a transmission formed of a plurality of levers and driven by a control shaft via a first cam disc, at least two members provided so as to be movable by said transmission so as to apply longitudinal forces to a workpiece, a driven second cam disc having a radius which changes abruptly at a point on its circumference, and a spring loaded lever arranged so as to rest on the circumference of the driven second cam disc; means for measuring pressure forces exerted on the workpiece areas by said pressing means; means for applying a welding voltage to the workpiece when the measured pressure forces exceed a threshold value, said voltage applying means providing a preset heating-up period after which said pressing means presses together the workpiece areas to be welded; and means for continuously adjusting the welding voltage as a function of the measured pressure forces.
Claim 9
Independent Claim
175 words
An apparatus for butt welding of chain links bent from round wire, comprising: means for pressing together areas of a workpiece to be welded, said pressing means including a transmission formed of a plurality of levers and driven by a control shaft via a first cam disc, at least two members provided so as to be movable by said transmission so as to apply longitudinal forces to a workpiece, a driven second cam disc having a radius which changes abruptly at a point on its circumference, and a spring loaded lever arranged so as to rest on the circumference of the driven second cam disc; means for measuring pressure forces exerted on the workpiece areas by said pressing means; means for applying a welding voltage to the workpiece when the measured pressure forces exceed a threshold value, said voltage applying means providing a preset heating-up period after which said pressing means presses together the workpiece areas to be welded; and means for continuously adjusting the welding voltage as a function of the measured pressure forces.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-24 | 1998-03-26 | 1998-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-24 | 2002-03-26 | 2002-09-25 | $7700.00 | Window Closed / Lapsed |