Patent US4162389A successfully refreshed from Google Patents.
US4162389A
Expired / Lapsed
US
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Welding apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1977-04-29
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Granted: 1979-07-24
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Expires: 1997-04-29
Abstract
Abstract In a welding apparatus for overlaying on a base metal, a reverse polarity soft plasma arc is formed between an electrode and the base metal and a welding rod is fed into the arc to weld the base metal by melting the welding rod and the feeding speed of the welding rod is controlled corresponding to the arc current to form a bead having low penetration.
Inventors
- 👤 Wataru Shimdada
- 👤 Kazumichi Machida
- 👤 Susumu Hoshinouchi
- 👤 Seigo Hiramoto
- 👤 Masaru Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:17
CPC Classifications
B; B23; B23K; B23K10/00; B23K10/02; B23K9/00; B23K9/04; B23K9/12; B23K9/124
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A welding apparatus for welding a base metal which comprises: a reverse polarity soft plasma arc source; means for supplying shield gas connected to said arc source; welding rod feeding means disposed adjacent to said arc source; means for supplying arc current, in reverse polarity, to said arc source operably connected to said arc source and said base metal; means for controlling feeding speed of said welding rod corresponding to said arc current; and means for imparting a transverse oscillation to said arc source at a predetermined speed and for incorporating an active gas at a predetermined rate in said shield gas wherein said predetermined rate of incorporating active gas is automatically controlled correspondingly to said transverse oscillating speed of said arc source.
Claim 2
Dependent Claim
123 words
A welding apparatus for welding a base metal which comprises: a reverse polarity soft plasma arc source; means for supplying shield gas connected to said arc source; welding rod feeding means disposed adjacent to said arc source; means for supplying arc current, in reverse polarity, to said arc source operably connected to said arc source and said base metal; means for controlling feeding speed of said welding rod corresponding to said arc current; and means for imparting a transverse oscillation to said arc source at a predetermined speed and for incorporating an active gas at a predetermined rate in said shield gas wherein said predetermined rate of incorporating active gas is automatically controlled correspondingly to said transverse oscillating speed of said arc source.
Claim 3
Dependent Claim
14 words
A welding apparatus according to claim 1, wherein the arc-source is a non-consumable electrode.
Claim 4
Dependent Claim
26 words
A welding apparatus according to claim 2, wherein the shield gas is an inert gas and the active gas is CO 2 or O 2 .
Claim 5
Dependent Claim
36 words
A welding apparatus as set forth in claim 3, wherein said predetermined speed of oscillation is 50 to 300 cycles per minute and said predetermined rate of incorporating gas is 0.05 to 1.00 liters per minute.
Claim 6
Dependent Claim
31 words
A welding apparatus as set forth in claim 4, wherein said arc current is 50 to 400 amps and said feeding speed of said welding rod is 0.05 to 6.0 m/minute.
Claim 7
Dependent Claim
31 words
A welding apparatus as set forth in claim 3, wherein said arc current is 50 to 400 amps and said feeding speed of said welding rod is 0.05 to 6.0 m/minute.
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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) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |