US3717865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stud welding bad weld detection circuit
Assignee: KSM Fastening Systems Inc
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Filing: 1970-06-30
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Granted: 1973-02-20
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Expires: 1990-06-30
Abstract
Abstract Apparatus for use with stud welding equipment employing a stud welding gun, a power supply and a controller for initiating the welding cycle and controlling the discharge of welding energy from the power supply across the stud and workpiece which detects the occurrence of bad welds and operates to generate an alarm signal and/or discontinue further operation of the welding apparatus. A first circuit is employed across the welding power supply and senses the discharge thereof to generate a first signal indicative that a normal weld has occurred. A second circuit connected through the controller generates a second signal upon the weld command to the controller indicating an attempted weld. The first and second signals are fed into a binary counter wherein the first signal indicating a successful weld resets the counter to 0 and the second signal indicating the weld command advances the counter to a count of 1. Upon the occurrence of the first bad weld indicated by the absence of a first signal, the second signal will advance the binary counter to a binary count of 2 upon which a signal light will be turned on. Upon the second successive weld failure, the next appearing second signal indicating a second weld command will advance the binary counter to a count of 3 which functions through circuit relays to disable the welding apparatus from further operation. One bad weld followed by a normal weld will result in the first signal resetting the binary counter to 0 and permitting continued operation.
Inventors
- 👤 J Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:32
CPC Classifications
B; B23; B23Q; B23Q15/00; B23K; B23K9/00; B23K9/095; B23K9/0956; B23K9/20; B23K9/201
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
A weld failure detection control circuit for controlling stud welding apparatus comprising; circuit means responsive to a successful weld for producing a first signal, circuit means responsive to a weld command for producing a second signal, time delay means for delaying the occurrence of the second signal until the occurrence of the first signal, binary counter means responsive upon the receipt of the first signal to reset to 0 and upon the receipt of successive second signals to count in binary code, and means in circuit with the counter and the stud welding apparatus and responsive to a binary 2 count for lighting an indicator light and responsive to a binary 3 count for disabling the stud welding apparatus from further operation.
Claim 2
Dependent Claim
122 words
A weld failure detection control circuit for controlling stud welding apparatus comprising; circuit means responsive to a successful weld for producing a first signal, circuit means responsive to a weld command for producing a second signal, time delay means for delaying the occurrence of the second signal until the occurrence of the first signal, binary counter means responsive upon the receipt of the first signal to reset to 0 and upon the receipt of successive second signals to count in binary code, and means in circuit with the counter and the stud welding apparatus and responsive to a binary 2 count for lighting an indicator light and responsive to a binary 3 count for disabling the stud welding apparatus from further operation.
Claim 3
Dependent Claim
122 words
A weld failure detection control circuit for controlling stud welding apparatus comprising; circuit means responsive to a successful weld for producing a first signal, circuit means responsive to a weld command for producing a second signal, time delay means for delaying the occurrence of the second signal until the occurrence of the first signal, binary counter means responsive upon the receipt of the first signal to reset to 0 and upon the receipt of successive second signals to count in binary code, and means in circuit with the counter and the stud welding apparatus and responsive to a binary 2 count for lighting an indicator light and responsive to a binary 3 count for disabling the stud welding apparatus from further operation.
Claim 4
Dependent Claim
122 words
A weld failure detection control circuit for controlling stud welding apparatus comprising; circuit means responsive to a successful weld for producing a first signal, circuit means responsive to a weld command for producing a second signal, time delay means for delaying the occurrence of the second signal until the occurrence of the first signal, binary counter means responsive upon the receipt of the first signal to reset to 0 and upon the receipt of successive second signals to count in binary code, and means in circuit with the counter and the stud welding apparatus and responsive to a binary 2 count for lighting an indicator light and responsive to a binary 3 count for disabling the stud welding apparatus from further operation.
Claim 5
Dependent Claim
141 words
Stud welding apparatus including a weld failure detection circuit comprising; a stud welding gun, a controller for initiating and controlling the stud welding cycle, a power supply providing the welding energy for the stud welding gun, a counter, first signal generating means connected between the power supply and the counter and generating a first signal responsive to the conduction of the power supply during the welding cycle for producing a first signal indicative of a bad weld, second signal generating means connected between the controller and the counter for generating a second signal indicative of a weld command, said counter being responsive to the occurrence of both said first and second signals to generate a third signal and, control means in circuit between said controller and the counter and responsive to said third signal for discontinuing operation of the welding apparatus.
Claim 6
Dependent Claim
141 words
Stud welding apparatus including a weld failure detection circuit comprising; a stud welding gun, a controller for initiating and controlling the stud welding cycle, a power supply providing the welding energy for the stud welding gun, a counter, first signal generating means connected between the power supply and the counter and generating a first signal responsive to the conduction of the power supply during the welding cycle for producing a first signal indicative of a bad weld, second signal generating means connected between the controller and the counter for generating a second signal indicative of a weld command, said counter being responsive to the occurrence of both said first and second signals to generate a third signal and, control means in circuit between said controller and the counter and responsive to said third signal for discontinuing operation of the welding apparatus.
Claim 7
Dependent Claim
135 words
A weld failure detection circuit for stud welding apparatus employing a stud welding gun, a power supply and a welding controller for controlling the welding cycle comprising; first circuit means in circuit with the power supply for generating a first signal in response to the discharge of the power supply through the welding gun, second circuit means in circuit with the controller for generating a second signal in response to the initiation of the welding cycle, counter means responsive both to the successive presence of second signals indicating attempted welds and to the absence of first signals indicating bad welds to count the omission of the first and second omitted first signals, and means responsive to the registration of a predetermined number of omitted first signals for altering the welding cycle in a desired manner.
Claim 8
Dependent Claim
135 words
A weld failure detection circuit for stud welding apparatus employing a stud welding gun, a power supply and a welding controller for controlling the welding cycle comprising; first circuit means in circuit with the power supply for generating a first signal in response to the discharge of the power supply through the welding gun, second circuit means in circuit with the controller for generating a second signal in response to the initiation of the welding cycle, counter means responsive both to the successive presence of second signals indicating attempted welds and to the absence of first signals indicating bad welds to count the omission of the first and second omitted first signals, and means responsive to the registration of a predetermined number of omitted first signals for altering the welding cycle in a desired manner.
Claim 9
Dependent Claim
77 words
The weld failure detection circuit of claim 3 further including a monitoring board and wherein the means responsive to the registration of omitted first signals includes First means connected between the counter means and monitoring board and responsive to the first counter omitted first signal for lighting a light on the monitoring board and second means connected between the counter and the controller and responsive to the second counted omitted first signal for discontinuing the welding cycle.
Claim 10
Dependent Claim
215 words
A weld failure detection circuit for stud welding apparatus employing a stud welding gun, a power supply and a controller for controlling the welding cycle comprising; a binary counter having set direct and transfer inputs and first and second binary column outputs, first circuit means connected between the power supply and the set direct input of the binary counter and providing a set direct input signal to the binary counter upon the discharge of the power supply through the welding gun, second circuit means connected between the controller and the transfer input of the binary counter and responsive to the initiation of the welding cycle to generate a transfer signal, time delay means in said second circuit means to delay the generation of the transfer signal until the time for the normal occurrence of the set direct signal has passed to result in a one binary count following each normal welding cycle, means connected to the second binary column output and responsive to a count of binary 2 for generating a signal indicating the first bad weld, and means in circuit between the controller and both said first and said second digital outputs and responsive to a binary count of 3 for discontinuing further welding cycles upon the occurrence of the second successive bad weld.
Claim 11
Dependent Claim
215 words
A weld failure detection circuit for stud welding apparatus employing a stud welding gun, a power supply and a controller for controlling the welding cycle comprising; a binary counter having set direct and transfer inputs and first and second binary column outputs, first circuit means connected between the power supply and the set direct input of the binary counter and providing a set direct input signal to the binary counter upon the discharge of the power supply through the welding gun, second circuit means connected between the controller and the transfer input of the binary counter and responsive to the initiation of the welding cycle to generate a transfer signal, time delay means in said second circuit means to delay the generation of the transfer signal until the time for the normal occurrence of the set direct signal has passed to result in a one binary count following each normal welding cycle, means connected to the second binary column output and responsive to a count of binary 2 for generating a signal indicating the first bad weld, and means in circuit between the controller and both said first and said second digital outputs and responsive to a binary count of 3 for discontinuing further welding cycles upon the occurrence of the second successive bad weld.
Claim 12
Dependent Claim
46 words
The weld failure detection circuit of claim 5 further including counter inhibiting means in circuit with said first and second binary column outputs and responsive to a binary count of 3 for preventing the passage of further transfer and set direct signals to the binary counter.
Claim 13
Dependent Claim
142 words
Stud welding apparatus including a weld failure detection circuit comprising, a stud welding gun, a controller for initiating and controlling the stud welding cycle, a power supply providing the welding energy for the stud welding gun, a counter, first signal generating means connected between the power supply and the counter and generating a first signal responsive to the conduction of the power supply during the welding cycle for producing a first signal indicative of a bad weld, second signal generating means connected between the controller and the counter for generating a second signal indicative of a weld command, said counter being responsive to the occurrence of both said first and second signals to generate a third signal and, means in circuit between said controller and the counter and responsive to said third signal for altering the weld cycle in a desired manner.
Claim 14
Dependent Claim
142 words
Stud welding apparatus including a weld failure detection circuit comprising, a stud welding gun, a controller for initiating and controlling the stud welding cycle, a power supply providing the welding energy for the stud welding gun, a counter, first signal generating means connected between the power supply and the counter and generating a first signal responsive to the conduction of the power supply during the welding cycle for producing a first signal indicative of a bad weld, second signal generating means connected between the controller and the counter for generating a second signal indicative of a weld command, said counter being responsive to the occurrence of both said first and second signals to generate a third signal and, means in circuit between said controller and the counter and responsive to said third signal for altering the weld cycle in a desired manner.
Claim 15
Dependent Claim
130 words
A weld failure detection circuit for stud welding apparatus employing a stud welding gun, a power supply and a welding controller for controlling the welding cycle comprising, first circuit means in circuit with the power supply for generating a first signal in response to the discharge of the power supply through the welding gun, second circuit means in circuit with the controller for generating a second signal in response to the initiation of the welding cycle, counter means responsive both to the successive presence of second signals indicating attempted welds and to the absence of first signals indicating bad welds to count the omission of first signals, and, means responsive to the registration of a predetermined number of omitted first signals for altering the welding cycle in a desired manner.
Claim 16
Dependent Claim
130 words
A weld failure detection circuit for stud welding apparatus employing a stud welding gun, a power supply and a welding controller for controlling the welding cycle comprising, first circuit means in circuit with the power supply for generating a first signal in response to the discharge of the power supply through the welding gun, second circuit means in circuit with the controller for generating a second signal in response to the initiation of the welding cycle, counter means responsive both to the successive presence of second signals indicating attempted welds and to the absence of first signals indicating bad welds to count the omission of first signals, and, means responsive to the registration of a predetermined number of omitted first signals for altering the welding cycle in a desired manner.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |