US3679866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed arc spray welding in a narrow groove
Assignee: Kobe Steel Ltd
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Filing: 1970-06-09
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Granted: 1972-07-25
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Expires: 1990-06-09
Abstract
Abstract A process for multi-layered spray arc welding using a gas shielded consumable electrode which comprises: preparing the welding edge of each of a pair of plate members such that when said members are placed into welding alignment, the combination of their prepared edges will together form an I-shaped or Vshaped welding line groove between said members, placing said plate members into welding alignment so as to form said welding line groove, and spray arc welding said plate members along said welding line groove with consumable electrode in the presence of a shielding gas by passing a welding current having a rectangular waveform through said electrode to said welding line, such that at recurring intervals, a welding arc having a current density of from 100 to 300 amp/mm2 is established between the tip of said consumable electrode and said welding line groove for a period of time of from 0.3 to 5 seconds, and extinguished for a period of time of from 0.2 to 3 seconds, such that when said arc is established, molten metal droplets are transferred to said groove, and when said arc is extinguished, the transfer of molten metal droplets is interrupted.
Inventors
- 👤 Masayasu Arikawa
- 👤 Tomokazu Godai
- 👤 Toshio Arai
- 👤 Hironosuke Kada
- 👤 Akihiko Iochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:58
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/16; B23K9/173
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
225 words
A process for multi-layered spray arc welding using a consumable electrode which comprises: preparing the welding edge of each of a pair of plate members having a thickness of at least 12 mm. such that when said members are placed into welding alignment, the combination of their prepared edges will together form a narrow welding line groove between said members, placing said plate members into welding alignment so as to form said welding groove, and spray arc welding said plate members along said welding line groove with a consumable electrode by passing a welding current having a rectangular wave-form through said electrode to said welding line, such that at recurring intervals, a gas shielded welding arc having a current density of from 100 to 300 amp/mm2 is established between the tip of said consumable electrode and said welding line groove for a period of time of from 0.3 to 5 seconds, and extinguished for a period of time of from 0.2 to 3 seconds, such that when said arc is established, molten metal droplets are transferred to said groove, and when said arc is extinguished, the transfer of molten metal droplets is interrupted, and moving said electrode at a rate such that for each interval of arcing time a deposit will be formed which will partially overlap the deposit formed during the preceding arcing interval.
Claim 2
Dependent Claim
225 words
A process for multi-layered spray arc welding using a consumable electrode which comprises: preparing the welding edge of each of a pair of plate members having a thickness of at least 12 mm. such that when said members are placed into welding alignment, the combination of their prepared edges will together form a narrow welding line groove between said members, placing said plate members into welding alignment so as to form said welding groove, and spray arc welding said plate members along said welding line groove with a consumable electrode by passing a welding current having a rectangular wave-form through said electrode to said welding line, such that at recurring intervals, a gas shielded welding arc having a current density of from 100 to 300 amp/mm2 is established between the tip of said consumable electrode and said welding line groove for a period of time of from 0.3 to 5 seconds, and extinguished for a period of time of from 0.2 to 3 seconds, such that when said arc is established, molten metal droplets are transferred to said groove, and when said arc is extinguished, the transfer of molten metal droplets is interrupted, and moving said electrode at a rate such that for each interval of arcing time a deposit will be formed which will partially overlap the deposit formed during the preceding arcing interval.
Claim 3
Dependent Claim
23 words
The process of claim 1, wherein said plate members are characterized by a thickness of at least 12 mm. at their welding edges.
Claim 4
Dependent Claim
15 words
The process of claim 1, wherein said plate members are welded in an overhead position.
Claim 5
Dependent Claim
88 words
The process of claim 1, wherein during the period in which the welding arc is extinguished, the welding voltage and the welding current are reduced to a value of less than the maximum voltage in current occurring during the period in which the welding arc was established, so as to establish a pilot arc between the tip of the consumable electrode and the welding line groove for the purpose of facilitating the re-establishment of the welding arc when the amperage and voltage are returned to their maximum values.
Claim 6
Dependent Claim
16 words
The process of claim 1, wherein said plate members are composed of high tensile strength steel.
Claim 7
Dependent Claim
26 words
The process of claim 1, wherein during the period in which the arc is extinguished, the welding voltage and the welding current are reduced to zero.
Claim 8
Dependent Claim
55 words
The process of claim 6, wherein a high frequency voltage is synchronously superimposed over said rectangular wave-form welding current during the period in which said welding arc is extinguished and said welding curreNt is at its zero value, so as to provide a high frequency arc discharge prior to the re-establishment of the welding arc.
Claim 9
Dependent Claim
12 words
The process of claim 1, wherein said welding line gRoove is I-shaped.
Claim 10
Dependent Claim
26 words
The process of claim 8, wherein said plate members are aligned such that the width of said welding line groove is from 4 to 15 millimeters.
Claim 11
Dependent Claim
12 words
The process of claim 1, wherein said welding line groove is V-shaped.
Claim 12
Dependent Claim
39 words
The process of claim 10, wherein said plate members are aligned such that the width of said welding line groove is 0 to 15 mm. at its narrowest point and from 4 to 15 mm. at its widest point.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |