US3584181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of arc welding for hard facing
Assignee: Hitachi Ltd
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Filing: 1969-05-29
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Granted: 1971-06-08
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Expires: 1989-05-29
Abstract
Abstract In welding for providing a metallic work with hard facing, in which an electric arc is maintained between a consumable tape electrode and said metallic work, the arc being submerged in powder of flux, while the surface of said metallic work is being gradually coated with the molten electrode material; the improvement comprises the application of a magnetic field during the welding process to eliminate the malignant effect of a circular magnetic field around the electrode caused by the welding current and thereby to obtain a uniformly coated surface.
Inventors
- 👤 Tadashi Nemoto
- 👤 Kiyoshi Watanabe
- 👤 Kazuei Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:28
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/08; B23K9/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
109 words
A method of submerged arc welding for hard facing, in which an electric arc is maintained between a consumable tape electrode and a work to be faced, the arc being submerged in flux material, while the tip portion of said consumable tape electrode is being melted off and the molten metal of said tape electrode is forming the hard facing on the surface of said work, characterized in that an additional magnetic field through said electrode and said work is supplied in the direction from said electrode to said work so as to produce a resultant electromagnetic force which makes the surface of said molten metal even and smooth.
Claim 2
Independent Claim
109 words
A method of submerged arc welding for hard facing, in which an electric arc is maintained between a consumable tape electrode and a work to be faced, the arc being submerged in flux material, while the tip portion of said consumable tape electrode is being melted off and the molten metal of said tape electrode is forming the hard facing on the surface of said work, characterized in that an additional magnetic field through said electrode and said work is supplied in the direction from said electrode to said work so as to produce a resultant electromagnetic force which makes the surface of said molten metal even and smooth.
Claim 3
Dependent Claim
62 words
A welding method as defined in claim 1, wherein said electromagnetic force is produced by an interaction between the welding current in said molten metal and a magnetic field which is a combination of the magnetic field due to the welding current and a magnetic field due to a magnetizing means provided in the vicinity of the path of the welding current.
Claim 4
Dependent Claim
29 words
A welding method as defined in claim 2, wherein said electromagnetic force has at least a component in the direction opposite to that of the proceeding of the welding.
Claim 5
Dependent Claim
42 words
A welding method as defined in claim 2, wherein said magnetizing means comprises a coil of a plurality of turns and the magnetizing force due to said magnetizing means is in a range expressed by (welding current + or - 300) AT/m.
Claim 6
Dependent Claim
29 words
A welding method as defined in claim 2, wherein said consumable tape electrode is not more than 75 mm. in width and not more than 1 mm. in thickness.
Claim 7
Dependent Claim
17 words
A welding method as defined in claim 2, wherein the welding speed is 200 to 350 mm./min.
Claim 8
Dependent Claim
28 words
A welding method as defined in claim 2, wherein the work is preheated at a temperature between 300* C. aNd 400* C. and is annealed after the welding.
Claim 9
Dependent Claim
16 words
A welding method as defined in claim 4, wherein said coil is wound on the work.
Claim 10
Dependent Claim
18 words
A welding method as defined in claim 4, wherein said coil is wound on said consumable tape electrode.
Claim 11
Dependent Claim
20 words
A welding method as defined in claim 1, which is adapted to a work having a flat or curved surface.
Claim 12
Independent Claim
165 words
A method of submerged arc welding for providing a metallic work with a hard facing, comprising the steps of: providing a work to be faced and a consumable tape electrode therefor, said electrode being fed in a direction substantially perpendicular to the portion of the surface of said work to be welded; establishing and maintaining an electric arc between said consumable tape electrode and said work, said work having a circular magnetic field established therein by the welding current applied thereto and said arc being submerged in flux material, while the tip portion of said consumable tape electrode is being melted off and the molten metal of said tape electrode is forming a hard facing on the surface of said work; and applying through said electrode and said work, a magnetic field in addition to said circular magnetic field, in a direction from said electrode toward said work, thereby providing a resultant electromagnetic force which makes the surface of said molten metal even and smooth.
Claim 13
Independent Claim
165 words
A method of submerged arc welding for providing a metallic work with a hard facing, comprising the steps of: providing a work to be faced and a consumable tape electrode therefor, said electrode being fed in a direction substantially perpendicular to the portion of the surface of said work to be welded; establishing and maintaining an electric arc between said consumable tape electrode and said work, said work having a circular magnetic field established therein by the welding current applied thereto and said arc being submerged in flux material, while the tip portion of said consumable tape electrode is being melted off and the molten metal of said tape electrode is forming a hard facing on the surface of said work; and applying through said electrode and said work, a magnetic field in addition to said circular magnetic field, in a direction from said electrode toward said work, thereby providing a resultant electromagnetic force which makes the surface of said molten metal even and smooth.
Claim 14
Dependent Claim
20 words
A method according to claim 11, further including the step of rotating said work with respect to said tape electrode.
Claim 15
Dependent Claim
23 words
A method according to claim 12, wherein said step of rotating includes rotating said work at a speed of 200 to 350 mm./min.
Claim 16
Dependent Claim
23 words
A method according to claim 13, further including the step of preheating said work to a temperature between 300* C. and 400* c.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |