US4745257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser welding method
Assignee: Mitsubishi Electric Corp
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Filing: 1987-04-14
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Granted: 1988-05-17
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Expires: 2007-04-14
Abstract
Abstract A laser welding method and apparatus for welding stacked coated members in which voids in the welds are positively eliminated. A spacer is disposed between the two members to be welded. This provides a path for discharging gas formed by heating the coating material. The method and apparatus of the invention are useful for the laser welding of base members coated with metals having a lower melting point than the metal of the base, paints and oils. Preferably, the width of the gap is in a range of 0.1 mm to 0.5 mm.
Inventors
- 👤 Naotake Rito
- 👤 Masao Ohta
- 👤 Tsugio Yamada
- 👤 Junichi Gotoh
- 👤 Tsutomu Kitagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/20; B23K26/21; B23K26/02; B23K26/035; B23K26/037; B23K26/16; B23K26/24; B23K26/244; B23K2101/00; B23K2101/34; B23K2103/00; B23K2103/02; B23K2103/04; B23K2103/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A laser welding method comprising the following steps: covering materials to be welded with coating material having a lower melting point than the base metal thereof; stacking said materials to be welded one on top of another while positioning a spacer therebetween to provide a continuous predetermined air gap in the joints therebetween; and applying a laser beam to said materials to be welded to lap weld the latter, said continuous predetermined air gap forming a path for discharge of gas formed by heating said coating material during application of said laser beam.
Claim 2
Dependent Claim
93 words
A laser welding method comprising the following steps: covering materials to be welded with coating material having a lower melting point than the base metal thereof; stacking said materials to be welded one on top of another while positioning a spacer therebetween to provide a continuous predetermined air gap in the joints therebetween; and applying a laser beam to said materials to be welded to lap weld the latter, said continuous predetermined air gap forming a path for discharge of gas formed by heating said coating material during application of said laser beam.
Claim 3
Dependent Claim
16 words
The laser welding method as claimed in claim 1, wherein said coating material is a paint.
Claim 4
Dependent Claim
16 words
The laser welding method as claimed in claim 1, wherein said coating material is an oil.
Claim 5
Dependent Claim
31 words
The laser welding method as claimed in claim 1, wherein said air gap between said materials to be welded has a width in a range of 0.1 mm to 0.5 mm.
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |