GB664302A - Improvements in or relating to electric valve converting apparatus especially for resistance welding - Google Patents
Improvements in or relating to electric valve converting apparatus especially for resistance weldingInfo
- Publication number
- GB664302A GB664302A GB18975/49A GB1897549A GB664302A GB 664302 A GB664302 A GB 664302A GB 18975/49 A GB18975/49 A GB 18975/49A GB 1897549 A GB1897549 A GB 1897549A GB 664302 A GB664302 A GB 664302A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thyratron
- valve
- circuit
- condenser
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/248—Electric supplies using discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Abstract
664,302. Converting; supply systems for resistance welding. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. July 19, 1949 [Sept. 30, 1948], No. 18975/49. Classes 38 (ii) and 38 (iv). A system for supplying current from a single phase source to a load, particularly for resistance welding, comprises two pairs of back-to-back discharge valves connected in parallel between the source and load and controlled such that the first valve of each pair are rendered conductive successively at each half-cycle for a predetermined number of half-cycles to supply a unidirectional current of one polarity to the load followed by the successive conduction of the second valve of each pair in a like manner to provide the load with a unidirectional current of opposite polarity. As shown, the two pairs of ignitrons 11, 13 and 15, 17 respectively supply current to the primary winding of the welding transformer 9, the first pair supplying current through the upper portion 7 and the second pair through the lower portion 19. Each ignitron is fired by a thyratron 177, 251, 245, 195, respectively, held off by a bias 179 until a pulse is received from control thyratrons 21, 25, 24, 23, respectively, which are triggered from a frequency control circuit comprising thyratrons 35, 37 and 39, each having included in its anode circuit condensers 127, 227, 211 connected respectively in the cathode grid circuits and thereby control the conduction of associated thyratrons 39, 35, 37, respectively. Thyratron 39 is normally conductive and condenser 211 is charged to hold off thyratron 37 until contact 143 is closed, whereupon thyratron 35 becomes conductive and sends a pulse at each positive half-wave via transformer 149 to thyratron 21. Condenser 127 then becomes charged to cut off thyratron 39, and condenser 211 is discharged over resistance 203 to allow thyratron 37 to become conductive and so provide a pulse at each cycle to thyratron 24 and simultaneously charge 227 to cut off thyratron 35, and allow thyratron 39 to reconduct and so repeat the cycle until relay contact 145 is opened. The number of successive unidirectional pulses provided over transformers 149 and 221 is determined by the discharge times of condensers 211 and 127, respectively. The pulses applied to the grid circuit of valve 21 causes the valve t'o conduct to cause (a) the firing of thyratron 177 over transformer 171, to set off ignitron 11 and (b) also apply a pulse over transformer 171 to valve 23 which in turn sets off via thyratron 195, ignitron 17. Each pulse applied to valve 24 similarly sets off ignitrons 15 and 13. The sequence timing circuit including relay contacts 139 and 145 comprises thyratrons 43, 45, 47, 49 which respectively control the " Squeeze," " Weld," " Hold " and " Off " periods by controlling relays 77, 83, 89, 93, 119. Each thyratron is controlled by a condenser 59 in the gridcathode circuit and which is connected to a line 63 over a relay contact 75, 81, 87, 91, respectively, on a preceding relay, the time interval being determined by the discharge time of condenser 59 through resistance 61 when the relay contact is opened and allow the thyratron to conduct and energize the relay coil in its anode circuit. A connection is made between point 123 in the grid circuit of weld thyratron 45 via the grid circuit of weld thyratron 39 to ensure that the weld is not terminated until thyratron 45 conducts. The sequence of events is initiated by depressing push-button 128, which effects energization of relay 77. To obtain repeat of the sequence of operations the switch 257 is placed in its lower position.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US664302XA | 1948-09-30 | 1948-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB664302A true GB664302A (en) | 1952-01-02 |
Family
ID=22069449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18975/49A Expired GB664302A (en) | 1948-09-30 | 1949-07-19 | Improvements in or relating to electric valve converting apparatus especially for resistance welding |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB664302A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE970768C (en) * | 1953-01-22 | 1958-10-30 | David Sciaky | AC-powered resistance welding machine for welding with direct or alternating current |
-
1949
- 1949-07-19 GB GB18975/49A patent/GB664302A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE970768C (en) * | 1953-01-22 | 1958-10-30 | David Sciaky | AC-powered resistance welding machine for welding with direct or alternating current |
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