GB530238A - Improvements in or relating to the control of electric current by means of dischargeapparatus - Google Patents
Improvements in or relating to the control of electric current by means of dischargeapparatusInfo
- Publication number
- GB530238A GB530238A GB6698/39A GB669839A GB530238A GB 530238 A GB530238 A GB 530238A GB 6698/39 A GB6698/39 A GB 6698/39A GB 669839 A GB669839 A GB 669839A GB 530238 A GB530238 A GB 530238A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- current
- ignitrons
- igniting
- electrodes
- 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
530,238. Control systems for resistance welding; rectifying alternate currents. WESTING- HOUSE ELECTRIC INTERNATIONAL CO. March 1, 1939, Nos. 6698 and 6699. Convention dates, March 5, 1938, and June 16, 1938. [Classes 38 (ii) and 38 (iv)] In apparatus wherein an alternating current is controlled by " ignitrons " the potentials of the starting electrodes of the ignitrons are supplied from the source of the current to be controlled through circuits which do not include rectifying devices or other means for distorting the potential curve. Fig. 1 shows such an arrangement applied to a seam-welding machine. The ignitrons 41, 43 are connected back-to-back across the supply leads 35, 37 in series with the primary 33 of the welding transformer and their igniting electrodes 49 are connected by conductor 91, 93 and a switch 85. The switch 85 is operated by a relay controlled by a commutator 57 driven by a motor 55, so that its circuit is closed for definite periods, each of which comprises several periods of the current. The relation of these periods and the result of the switch being closed at different points of the current-cycle are discussed in the Specification. The igniting- electrode and cathode of each rectifier may be connected by auxiliary circuiting including rectifiers. In a modification the winding 33 may be supplied directly from the mains through a transformer in opposition to the current through the ignitron, and the igniting-electrodes supplied from the tapping secondary of the transformer. In another modification for spot welding the igniting electrodes are connected through a relay arranged to break the circuit after a definite adjustable interval. Fig. 22 shows an arrangement for rectifying and controlling the current. The ignitrons 301, 303 are connected to the secondary of a transformer 299 and the load 297 to a centre tapping on 'the transformer. The igniting- electrodes 309 are supplied from the secondaries 319, 317 of a transformer 321 through windings 323, 325 on the side limb of a reactor 315. The load is connected in series with a winding 313 on the centre limb of the reactor, which is presaturated from a source 329. By regulating the degree of the saturation the point of the cycle at which the ignitrons conduct can be adjusted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US530238XA | 1938-03-05 | 1938-03-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB530238A true GB530238A (en) | 1940-12-09 |
Family
ID=21981428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6698/39A Expired GB530238A (en) | 1938-03-05 | 1939-03-01 | Improvements in or relating to the control of electric current by means of dischargeapparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB530238A (en) |
-
1939
- 1939-03-01 GB GB6698/39A patent/GB530238A/en not_active Expired
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