US4556777A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for welding line tracer control
Assignee: Hitachi Industrial Equipment Systems Co Ltd
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Filing: 1983-12-23
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Granted: 1985-12-03
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Expires: 2003-12-23
Abstract
Abstract In welding effected by weaving an electrode, welding current or voltage is applied to a frequency analyzer, for deriving a frequency component having the same period as a weaving period and a doubled frequency component having a period which is half the weaving frequency. The center of weaving motion is corrected in relation to the two frequency components to thereby effect tracer control for the electrode.
Inventors
- 👤 Shinichi Sarugaku
- 👤 Akira Tsuchihashi
- 👤 Masao Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/12; B23K9/127
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
121 words
A method for welding line tracer control in which, during welding effected by weaving an electrode, changes in welding current flowing through the electrode are detected to tracer-control a welding torch along a welding line, wherein a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period are derived from a detected change in welding current, and a control output is produced to control means for controlling the center position of weaving motion of said torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 2
Independent Claim
121 words
A method for welding line tracer control in which, during welding effected by weaving an electrode, changes in welding current flowing through the electrode are detected to tracer-control a welding torch along a welding line, wherein a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period are derived from a detected change in welding current, and a control output is produced to control means for controlling the center position of weaving motion of said torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 3
Dependent Claim
43 words
A method for welding line tracer control according to claim 1 wherein the control output for controlling the center position of the weaving motion is delivered out when a waveform indicative of the swinging of the weaving motion comes into a specified state.
Claim 4
Dependent Claim
98 words
A method for welding line tracer control according to claim 2 wherein the waveform indicative of the swinging of the weaving motion is a sine wave having a given amplitude A and when the swinging frequency component and the doubled swinging frequency component, both derived from the waveform indicative of the change of welding current in response to the weaving motion, have an amplitude D 1 represented by a complex number and an amplitude D 2 represented by a complex number, respectively, the control output is delivered out in accordance with ##EQU18## where j represents the imaginary unit.
Claim 5
Dependent Claim
32 words
A method for welding line tracer control according to claim 3 wherein said swinging waveform of weaving motion is a composite sine wave containing two or more sine waves of different periods.
Claim 6
Dependent Claim
98 words
A method for welding line tracer control according to claim 1 wherein a waveform indicative of the swinging of the weaving motion is a sine wave having a given amplitude A and when the swinging frequency component and the doubled swinging frequency component, both derived from the waveform indicative of the change of welding current in response to the weaving motion, have an amplitude D 1 represented by a complex number and an amplitude D 2 represented by a complex number, respectively, the control output is delivered out in accordance with ##EQU19## where j represents the imaginary unit.
Claim 7
Dependent Claim
32 words
A method for welding line tracer control according to claim 5 wherein said swinging waveform of weaving motion is a composite sine wave containing two or more sine waves of different periods.
Claim 8
Independent Claim
165 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding current flowing through the consumptive electrode; Fourier function transform means for deriving, from a change in welding current detected by said detection means, a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period; and control means for controlling the center position of weaving motion of said welding torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 9
Independent Claim
165 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding current flowing through the consumptive electrode; Fourier function transform means for deriving, from a change in welding current detected by said detection means, a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period; and control means for controlling the center position of weaving motion of said welding torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 10
Independent Claim
117 words
A method for welding line tracer control in which, during welding effected by weaving an electrode, changes in welding voltage are detected to tracer-control a welding torch along a welding line, wherein a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period are derived from a detected change in welding voltage, and a control output is produced to control means for controlling the center position of weaving motion of said torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 11
Independent Claim
117 words
A method for welding line tracer control in which, during welding effected by weaving an electrode, changes in welding voltage are detected to tracer-control a welding torch along a welding line, wherein a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period are derived from a detected change in welding voltage, and a control output is produced to control means for controlling the center position of weaving motion of said torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 12
Dependent Claim
43 words
A method for welding line tracer control according to claim 8 wherein the control output for controlling the center position of the weaving motion is delivered out where a waveform indicative of the swinging of the weaving motion comes into a specified state.
Claim 13
Dependent Claim
98 words
A method for welding line tracer control according to claim 9 wherein a waveform indicative of the swinging of the weaving motion is a sine wave having a given amplitude A and when the swinging frequency component and the doubled swinging frequency component, both derived from the waveform indicative of the change of welding voltage in response to the weaving motion, have an amplitude D 1 represented by complex number and an amplitude D 2 , represented by a complex number respectively, the control output is delivered out in accordance with ##EQU20## where j represents the imaginary unit.
Claim 14
Dependent Claim
32 words
A method for welding line tracer control according to claim 10 wherein said swinging waveform of weaving motion is a composite sine wave containing two or more since waves of different periods.
Claim 15
Dependent Claim
97 words
A method for welding line tracer control according to claim 8 wherein a waveform indicative of the swinging of the weaving motion is a sine wave having a given amplitude A and when the swinging frequency component and the doubled swinging frequency component, both derived from the waveform indicative of the change of welding voltage in response to the weaving motion, have an amplitude D 1 represented by complex number and an amplitude D 2 represented by a complex number, respectively, the control output is delivered out in accordance with ##EQU21## where j represents the imaginary unit.
Claim 16
Dependent Claim
32 words
A method for welding line tracer control according to claim 12 wherein said swinging waveform of weaving motion is a composite sine wave containing two or more sine waves of different periods.
Claim 17
Independent Claim
160 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding voltage; Fourier function transform means for driving, from a change in welding voltage detected by said detection means, a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period; and control means for controlling the center position of weaving motion of said welding torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 18
Independent Claim
160 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding voltage; Fourier function transform means for driving, from a change in welding voltage detected by said detection means, a swinging frequency component having the same period as a weaving period and a doubled swinging frequency component having a period which is half the weaving period; and control means for controlling the center position of weaving motion of said welding torch to move in a direction perpendicular to said welding line until a ratio between said swinging frequency component and said doubled swinging frequency component corresponds to a predetermined value.
Claim 19
Independent Claim
86 words
A method for controlling a weaving welding torch to trace a welding line, comprising the steps of: detecting changes in welding current flowing through an electrode; deriving a swinging frequency component from the detected changes in the welding current, said swinging frequency component having the same period as a weaving period of said welding torch; and moving the center position of weaving motion of said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 20
Independent Claim
86 words
A method for controlling a weaving welding torch to trace a welding line, comprising the steps of: detecting changes in welding current flowing through an electrode; deriving a swinging frequency component from the detected changes in the welding current, said swinging frequency component having the same period as a weaving period of said welding torch; and moving the center position of weaving motion of said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 21
Dependent Claim
18 words
A method of controlling a weaving welding torch according to claim 15, wherein said predetermined value is zero.
Claim 22
Independent Claim
82 words
A method for controlling a weaving welding torch to trace a welding line, comprising the steps of: detecting changes in welding voltage; deriving a swinging frequency component from the detected change in the welding voltage, said swinging frequency component having the same period as a weaving period of said welding torch; and moving the center position of weaving motion of said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 23
Independent Claim
82 words
A method for controlling a weaving welding torch to trace a welding line, comprising the steps of: detecting changes in welding voltage; deriving a swinging frequency component from the detected change in the welding voltage, said swinging frequency component having the same period as a weaving period of said welding torch; and moving the center position of weaving motion of said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 24
Dependent Claim
18 words
A method for controlling a weaving welding torch according to claim 17, wherein said predetermined value is zero.
Claim 25
Independent Claim
145 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding current flowing through the consumptive electrode; Fourier function transform means for deriving, from a change in welding current detected by said detection means, a swinging frequency component having the same period as a weaving period; and control means for controlling the center position of weaving motion of said welding torch to move said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 26
Independent Claim
145 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding current flowing through the consumptive electrode; Fourier function transform means for deriving, from a change in welding current detected by said detection means, a swinging frequency component having the same period as a weaving period; and control means for controlling the center position of weaving motion of said welding torch to move said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 27
Independent Claim
145 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding voltage flowing through the consumptive electrode; Fourier function transform means for deriving, from a change in welding voltage detected by said detection means, a swinging frequency component having the same period as a weaving period; and control means for controlling the center position of weaving motion of said welding torch to move said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
Claim 28
Independent Claim
145 words
An apparatus for welding line tracer control comprising: a welding torch with a welding wire serving as a consumptive electrode; torch support means movably supporting said welding torch for its movement in at least two directions; swinging means for effecting weaving motion of said torch support means in one direction; means for moving said torch support means in a direction along a welding line; detection means for detecting changes in welding voltage flowing through the consumptive electrode; Fourier function transform means for deriving, from a change in welding voltage detected by said detection means, a swinging frequency component having the same period as a weaving period; and control means for controlling the center position of weaving motion of said welding torch to move said welding torch in a direction perpendicular to said welding line until said detected swinging frequency component corresponds to a predetermined value.
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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) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |