{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7CUL542T/45954d83-5ac2-41cb-ad6a-1030a0299975/HTML","dcterms:extent":"29 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7CUL542T/3f49923a-114b-4504-8a74-29465257a484/PDF","dcterms:extent":"159 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7CUL542T/d71b1c84-ae16-4cc7-85a8-aaa836c62147/TEXT","dcterms:extent":"28 KB"}],"edm:TimeSpan":{"@rdf:about":"2000-2024","edm:begin":{"@xml:lang":"en","#text":"2000"},"edm:end":{"@xml:lang":"en","#text":"2024"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-7CUL542T","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/urn:nbn:si:spr-ihg6vo21"},{"@xml:lang":"sl","#text":"Materiali in tehnologije"}],"dcterms:issued":"2002","dc:creator":"Tušek, Janez","dc:format":[{"@xml:lang":"sl","#text":"številka:1/2"},{"@xml:lang":"sl","#text":"letnik:36"},{"@xml:lang":"sl","#text":"6 strani"},{"@xml:lang":"sl","#text":"str. 37-42"}],"dc:identifier":["ISSN:1580-2949","COBISSID:5110043","URN:URN:NBN:SI:doc-7CUL542T"],"dc:language":"sl","dc:publisher":{"@xml:lang":"sl","#text":"Inštitut za kovinske materiale in tehnologije"},"dc:subject":[{"@xml:lang":"sl","#text":"elektrode večžične"},{"@xml:lang":"sl","#text":"izkoristek"},{"@xml:lang":"sl","#text":"izkoristki energijski"},{"@xml:lang":"sl","#text":"obločno varjenje"},{"@xml:lang":"sl","#text":"talilno varjenje"},{"@xml:lang":"sl","#text":"učinki talilni"},{"@xml:lang":"sl","#text":"varjenje obločno"},{"@rdf:resource":"http://www.wikidata.org/entity/Q192704"}],"dcterms:temporal":{"@rdf:resource":"2000-2024"},"dc:title":{"@xml:lang":"sl","#text":"Pojavi pri varjenju z večžično elektrodo za povečanje talilnega učinka| Phenomena in arc welding with a multiple-wire electrode increasing energy efficiency|"},"dc:description":[{"@xml:lang":"sl","#text":"Arc welding with a multiple-wire electrode, particularly with a twin-wire electrode, has lately found increasing application in practice. We know submerged-arc and gas-shielded arc welding processes with a twin-wire electrode and submerged arc welding with a multiple-wire (triple wire, quadruple wire) electrode. A unit for multiple-wire welding allows welding and surfacing. A principle of multiple-wire welding is that a single welding current source, a joint wire feed mechanism, and common regulation are used while all the wires travel through the same contact tube. Weld shape can be affected by the arrangement of the wires in the contact tube with regard to the welding direction. The most important advantage of multiple-wire welding, however, is the efficiency of the electrical energy supplied. In this case, and advantage is taken of two physical phenomena, which are related but based on different principles. The first one is based on efficient utilisation of electric current when it is conducted through the wire extension, while the second one is based on a more efficient utilisation of heat energy of the arcs, i.e. more optimized energy input into a welded joint. The paper gives a description of the two physical principles accompanied by figures, theoretical calculations, and experimental results. In multiple-wire welding, welding current intensity in the wire extension varies and is practically never the same in all wires. The average value of the welding current intensity, however, is the same in each wire for the whole duration of welding. But the effective value is, due to variation of current intensity, higher than the average one, which produces a higher efficiency of the welding current. In multiple-wire welding, when the wires are arranged one after another, heat input into the workpiece has not a circular shape but an elliptical one. This increases energy efficiency and reduces heat influence on weld vicinity"},{"@xml:lang":"sl","#text":"Varjenje z večžično elektrodo se je v praksi uveljavilo predvsem kot varjenje z dvožično elektrodo. Danes poznamo varjenje z dvožično elektrodo pod praškom ali v zaščitnem plinu in varjenje z večžično elektrodo pod praškom (trižična, štirižična elektroda itd.). Naprava za varjenje z večžično elektrodo omogoča navarjanje in zvarjanje. Pri varjenju z večžično elektrodo uporabljamo samo en vir varilnega toka, vse žice potujejo skozi skupno kontaktno šobo, imajo enako hitrost in enoten pogonski sistem. Z razporeditvijo žic v skupni kontaktni šobi lahko vplivamo na obliko vara in termični varilni ciklus. Najpomembnejša prednost varjenja z večžično elektrodo je visok izkoristek električne energije, ki jo uporabimo za varjenje. Pri tem se odvijata dva fizikalna pojava, ki ta izkoristek povečata. Prvi temelji na izrabi dovedene električne energije, ki se prevaja skozi proste konce žic, drugi pa na višjem izkoristku obločne toplotne energije oziroma na ustreznejši obliki površine vnosa energije v varjenec. V članku sta oba pojava slikovno predstavljena, teoretično izračunana in z eksperimentalnimi rezultati dokazana. Pri varjenju z večžično elektrodo je količina efektivne toplote, ki se razvije zaradi prevajanja električnega toka v eni sami žici, v prostem koncu žice mnogo višja od tiste, ki se razvije v prostem koncu žice pri varjenju s samo eno žico pri enaki porabi električne energije na eno žico. Pri varjenju z večžično elektrodo, ko žice potujejo ena za drugo v smeri varjenja, se \"oblika\" vnosa energije v varjenec bistveno razlikuje od načina vnosa energije pri varjenju s samo eno žico. V takem primeru vnos energije v varjenec ni v obliki krožne površine kot pri varjenju z eno žico, ampak v obliki eliptične površine. Prav to pa poveča izkoristek dovedene energije in zmanjša toplotne izgube v okolico vara"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-7CUL542T","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-7CUL542T"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7CUL542T/3f49923a-114b-4504-8a74-29465257a484/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Inštitut za kovinske materiale in tehnologije"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-7CUL542T/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-7CUL542T"}}}}