US3866014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of welding laminated cores
Assignee: Advance Transformer Co
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Filing: 1973-05-11
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Granted: 1975-02-11
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Expires: 1993-05-11
Abstract
Abstract A method of welding laminated stacked cores of assembled electromagnetic devices which comprises initially stamping the core laminations so that the outer seams which will be produced on the lamination ends when the stacks are abutted has a central projection with a groove on opposite sides along the length of the seam, approximately half of the projection being formed on each part of the core. The electromagnetic device, fully assembled, is mounted in a jig with its core parts clamped together and is electrically connected to one terminal of the welding apparatus. The other terminal of the welding apparatus which carries the electrode is passed along the projection melting the projection and welding the core parts together on a fused joint that follows the seam.
Inventors
- 👤 Earl C Waller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:14
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233; H01F3/00; H01F3/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
196 words
A method of welding laminated cores of electromagnetic devices in which there are at least two core parts each formed of a separate stack of laminations, such parts having abutting faces forming interior connections having exterior seams, said method comprising stamping the laminations forming such parts with respective notches on opposite lateral edges, such notches each being spaced from the edge of the lamination which is to form a portion of an abutting face whereby to provide, when the laminations are stacked to form said parts, approximately half of a central projection with a contiguous parallel groove on each part at the edges to be abutted, assembling the laminated core by bringing the stacks into engagement with their opposed faces abutted to form a common connection and the part projections joining to form a full projection, the seams being located in the projection and joining after assembly to form a common seam, holding the electromagnetic device in assembly while connected to the ground terminal of welding apparatus, and passing the welding electrode of the welding apparatus along the common projection to cause the electric arc to pass through the projection closing the common seam with weldment.
Claim 2
Independent Claim
196 words
A method of welding laminated cores of electromagnetic devices in which there are at least two core parts each formed of a separate stack of laminations, such parts having abutting faces forming interior connections having exterior seams, said method comprising stamping the laminations forming such parts with respective notches on opposite lateral edges, such notches each being spaced from the edge of the lamination which is to form a portion of an abutting face whereby to provide, when the laminations are stacked to form said parts, approximately half of a central projection with a contiguous parallel groove on each part at the edges to be abutted, assembling the laminated core by bringing the stacks into engagement with their opposed faces abutted to form a common connection and the part projections joining to form a full projection, the seams being located in the projection and joining after assembly to form a common seam, holding the electromagnetic device in assembly while connected to the ground terminal of welding apparatus, and passing the welding electrode of the welding apparatus along the common projection to cause the electric arc to pass through the projection closing the common seam with weldment.
Claim 3
Dependent Claim
14 words
The method as claimed in claim 1 in which the notches are generally rectangular.
Claim 4
Dependent Claim
14 words
The method as claimed in claim 1 in which the notches are generally semicircular.
Claim 5
Dependent Claim
272 words
In a method for connecting two stacks of laminations together in edge abutting relationship along a seam between the two stacks to form an electromagnetically unitary structure and which includes assembling individual laminations into two stacks, said stacks not necessarily having the same configuration but all laminations in a stack being of substantially the same configuration, each lamination having a corner defined by the juncture of one outer lamination edge and one inner lamination edge, all of the aligned outer lamination edges of each stack forming an outer edge face of said stack and all of the aligned inner lamination edges of each stack forming an inner edge face of said stack, the lamination corners of each stack defining a stack corner, bringing an inner edge face of one stack into abutting engagement with the inner edge face of the other stack and with the stack corners juxtaposed to form said seam, and passing an electrical welding arc along said seam in close proximity thereto while tightly maintaining said abutting engagement, the invention herein which comprises: forming a notch at substantially the same location in the outer edge of each lamination spaced slightly from its corner with the notches of the laminations in each stack aligned so as to provide a groove in the outer stack edge face parallel to its stack corner and thereby forming a partial projection extending transversely of the stack at its inner edge face, whereby when the stacks are in abutting engagement the partial projections form a full projection with the seam defined between them so that the welding arc passes along the top of the projection.
Claim 6
Dependent Claim
272 words
In a method for connecting two stacks of laminations together in edge abutting relationship along a seam between the two stacks to form an electromagnetically unitary structure and which includes assembling individual laminations into two stacks, said stacks not necessarily having the same configuration but all laminations in a stack being of substantially the same configuration, each lamination having a corner defined by the juncture of one outer lamination edge and one inner lamination edge, all of the aligned outer lamination edges of each stack forming an outer edge face of said stack and all of the aligned inner lamination edges of each stack forming an inner edge face of said stack, the lamination corners of each stack defining a stack corner, bringing an inner edge face of one stack into abutting engagement with the inner edge face of the other stack and with the stack corners juxtaposed to form said seam, and passing an electrical welding arc along said seam in close proximity thereto while tightly maintaining said abutting engagement, the invention herein which comprises: forming a notch at substantially the same location in the outer edge of each lamination spaced slightly from its corner with the notches of the laminations in each stack aligned so as to provide a groove in the outer stack edge face parallel to its stack corner and thereby forming a partial projection extending transversely of the stack at its inner edge face, whereby when the stacks are in abutting engagement the partial projections form a full projection with the seam defined between them so that the welding arc passes along the top of the projection.
Claim 7
Dependent Claim
29 words
The method as claimed in claim 4 in which the groove and part projection of each stack are formed by providing a notch in each lamination prior to stacking.
Claim 8
Dependent Claim
24 words
The method as claimed in claim 4 in which the groove and part projection of each stack are formed after the laminations are stacked.
Claim 9
Dependent Claim
14 words
The method as claimed in claim 6 in which each groove is generally rectangular.
Claim 10
Dependent Claim
14 words
The method as claimed in claim 6 in which each groove is generally semicircular.
Claim 11
Dependent Claim
14 words
The method as claimed in claim 5 in which each groove is generally rectangular.
Claim 12
Dependent Claim
14 words
The method as claimed in claim 5 in which each groove is generally semicircular.
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |