http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1280727-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1818204c12a8038f48f9513cac2a9158 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B23K9-091 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B23K10-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B23K9-09 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B23K10-02 |
| filingDate | 1969-10-15^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6360647af5f1c1edc08ef1e316a514c9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f2fbc8a5ea2a7d31d43bc15fea5676e8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_441f506908c5cd67e834e66478283012 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7a65b866fc852d593946cb44477b899a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d794fb1e9961e31654f277fb58dd4a74 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_59617f1233421bd11d42c2ff27a3da31 |
| publicationDate | 1972-07-05^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1280727-A |
| titleOfInvention | A method and device for plasma-arc welding |
| abstract | 1280727 Welding by fusion INSTITUT ELEKTROSVARKI IMENI EO PATONA 15 Oct 1969 50626/69 Heading B3R [Also in Division H2] In plasma arc welding of small gauge sheet metals, e.g. of aluminium or its alloys, wherein a constantly burning pilot arc, between a non- consumable electrode 1 and a water-cooled copper nozzle 2, is supplied from a D.C. source 3, alternating voltage pulses (W 1 , W 2 ), respectively positive and negative with respect to the workpiece 4, are supplied respectively to the nozzle 2 to destroy surface oxide films and to the electrode to form the main fusing arc. As shown, the pulses (W 1 , W 2 ) are supplied respectively from a point a and a tap b of the secondary winding of a transformer 5 the primary winding of which is supplied by A.C. through an adjustable choke 9. During the positive voltage half-cycles the pulses (W 1 ) are supplied to the nozzle through a diode 7, a thyristor being arranged to be closed to avoid short-circuiting of the secondary winding part a, b by the pilot arc. At the beginning of the negative voltage half-cycle, a controlling circuit (not described) opens the thyristor 6 so that the pulse (W 2 ) is supplied therethrough to the electrode. The thyristor 6 may operate to provide groups of pulses of adjustable pulse number and group frequency. In Fig. 4 (not shown), the points a, b coincide, and the means 6 may be a non-controllable diode. When using a transformer 11 with a variable falling voltage characteristic (Fig. 5, not shown), the diode 7 is replaced by a thyristor (13) so controlled as to avoid arc-hampering loading of the secondary winding part a, b by the pilot arc when welding reverse polarity current lags. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/AU-784922-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4107507-A |
| priorityDate | 1969-10-15^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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