US4306139A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for welding hard metal
Assignee: IHI Corp
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Filing: 1979-12-26
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Granted: 1981-12-15
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Expires: 1999-12-26
Abstract
Abstract Disclosed is a method for welding wear-resisting hard metals directly to iron base members which are slide or wear members of machinery. Hard metals comprising a tungsten carbide and a binder consisting of 15 to 30% by weight of Ni and/or Co is employed as said hard metals. A Ni alloy metal containing no Cr is used as a filler metal.
Inventors
- 👤 Yukio Shinozaki
- 👤 Katsutoshi Naruse
- 👤 Teruo Harada
- 👤 Sadao Ohishibashi
- 👤 Susumu Yamaya
- 👤 Akira Fukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:33
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3033; B23K31/00; B23K31/02; B23K31/025; B23K9/00; B23K9/23; B23K9/232
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A method of welding a hard metal member to an iron base metal member wherein said hard metal member is made of a hard metal comprising mainly tungsten carbides and 15 to 30% by weight of a binder consisting of Ni and/or Co, said hard metal member being directly welded to said iron base metal member with a nickel alloy filler metal containing no Cr, and having more than 40% by weight of Ni.
Claim 2
Independent Claim
74 words
A method of welding a hard metal member to an iron base metal member wherein said hard metal member is made of a hard metal comprising mainly tungsten carbides and 15 to 30% by weight of a binder consisting of Ni and/or Co, said hard metal member being directly welded to said iron base metal member with a nickel alloy filler metal containing no Cr, and having more than 40% by weight of Ni.
Claim 3
Dependent Claim
30 words
A welding method as set forth in claim 1 wherein said tungsten carbides of the hard metal have a particle size ranging from 4 to 8 μm after being sintered.
References Cited (Backward Citations)
US1901654A
Cited
GB1076524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |