{"id":574,"date":"2019-02-07T22:00:50","date_gmt":"2019-02-07T19:00:50","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=574"},"modified":"2020-11-02T11:40:57","modified_gmt":"2020-11-02T08:40:57","slug":"stykovaya-svarka-oplavleniem","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/saldatura-di-testa-2\/","title":{"rendered":"Saldatura a testa a scintillio"},"content":{"rendered":"<p><strong>Saldatura a testa a scintillio<\/strong> Si tratta di un tipo di saldatura di testa a resistenza, classificata come saldatura a pressione. Questo tipo di saldatura \u00e8 apparso circa 90 anni fa. <strong>Saldatura a testa a scintillio<\/strong> \u00e8 un metodo efficace per unire metalli con una sezione trasversale fino a 100.000 mm<sup>2<\/sup>Viene utilizzato per collegare condotte, rinforzare strutture in cemento armato e unire profilati in acciaio. Questo metodo \u00e8 molto efficace per la produzione di binari ferroviari senza giunzioni e catene di ancoraggio.<\/p>\n<h2>Saldatura a testa a scintillio<\/h2>\n<p><strong>Saldatura a testa a scintillio<\/strong> \u00e8 il seguente:<\/p>\n<ul>\n<li>I pezzi vengono puliti da sporco, macchie d&#039;olio e ossidazione. Le estremit\u00e0 dei pezzi da saldare vengono preparate per un contatto preciso;<\/li>\n<li>le parti da saldare vengono fissate negli elettrodi di saldatura;<\/li>\n<li>dal trasformatore vengono fornite alle parti corrente elevata e bassa tensione;<\/li>\n<li>le superfici di accoppiamento vengono riscaldate fino a raggiungere uno stato plastico;<\/li>\n<li>quindi i pezzi vengono compressi con forza crescente e la corrente viene interrotta fino al completamento della pressatura.<\/li>\n<\/ul>\n<p><strong>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<\/strong><\/p>\n<p><strong>Saldatura a testa a scintillio<\/strong> Permette l&#039;unione dei pezzi a livello atomico. Il processo di cristallizzazione dei metalli crea una saldatura resistente.<\/p>\n<h3>Modalit\u00e0 di saldatura a flash<\/h3>\n<p><strong>Modalit\u00e0 di saldatura a flash<\/strong> Questo metodo presenta le seguenti caratteristiche:<\/p>\n<ul>\n<li>Giunzione esplosiva di parti. Questa \u00e8 causata dall&#039;elevata densit\u00e0 di corrente alle estremit\u00e0 dei pezzi, che li riscalda notevolmente. Durante la giunzione, si verifica un effetto esplosivo. Di conseguenza, parte del calore viene dissipato nell&#039;atmosfera sotto forma di schizzi di metallo, mentre il resto si accumula nel giunto. Questo crea uno strato di metallo liquido. Le parti vengono quindi unite rapidamente. Durante la giunzione, parte del metallo liquido e solido viene espulsa dalla zona di saldatura, creando una bava.<\/li>\n<li>Si realizza mediante fusione continua e intermittente.<\/li>\n<\/ul>\n<p>La caratteristica della fusione continua \u00e8 la graduale convergenza dei pezzi. Le loro estremit\u00e0 si toccano solo in corrispondenza di determinate sporgenze. Questo, tuttavia, \u00e8 sufficiente per un rapido riscaldamento e fusione, causando l&#039;esplosione e la fuoriuscita di parte del metallo. La convergenza continua e nuovi contatti fondono, formando uno strato liquido di metallo. Ora le estremit\u00e0 vengono rapidamente avvicinate con forza e i pezzi vengono saldati.<\/p>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>Il metodo di saldatura a flash intermittente prevede la compressione e la separazione alternate dei pezzi con una forza delicata. Poich\u00e9 questo processo avviene sotto corrente, le estremit\u00e0 dei pezzi vengono riscaldate dalla corrente di saldatura durante la compressione. Durante la separazione, si genera una scarica elettrica tra le estremit\u00e0. Questa scarica fonde la superficie dei metalli. Dopo diverse ripetizioni, il metallo fonde e i pezzi vengono compressi.<\/p>\n<p>Sono disponibili un&#039;ampia variet\u00e0 di macchine per saldatura a lampo e ciascuna ha le sue specifiche e <strong>modalit\u00e0 di saldatura a flash<\/strong>Le macchine MSGU-300 e MSGU-500 hanno specifiche identiche, ma differiscono per potenza. Sono utilizzate per la saldatura di bacchette fino a 70 mm di diametro con flashing continuo e preriscaldamento. La bacchetta viene serrata tramite una pinza pneumo-idraulica. Il meccanismo di ricalcatura \u00e8 azionato idraulicamente e il trasformatore di saldatura \u00e8 dotato di un selettore di fase del contattore.<\/p>\n<p>La MS-2008 salda barre di 60 mm di diametro mediante saldatura a scintillio continuo. La saldatura semiautomatica viene eseguita mediante saldatura a scintillio con riscaldamento. L&#039;azionamento di ricalcatura \u00e8 elettromeccanico, il telaio di serraggio \u00e8 dotato di un dispositivo pneumatico e il trasformatore di saldatura \u00e8 dotato di un interruttore a gradini. La macchina Chaika FBWM-60 esegue la saldatura a scintillio di lame, nastri e lame per seghe a nastro in acciaio ad alto tenore di carbonio e legato, seguita dal trattamento termico. \u00c8 dotata di controllo computerizzato, trattamento termico automatico, un design moderno della pinza e un rapido controllo della qualit\u00e0 della saldatura. Ognuna di queste macchine \u00e8 conforme agli standard <strong>modalit\u00e0 di saldatura a flash<\/strong> Per una giunzione salda dei pezzi. Il risultato \u00e8 una saldatura di alta qualit\u00e0.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-576 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0421\u0442\u044b\u043a\u043e\u0432\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u043e\u043f\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u0435\u043c.gif\" alt=\"Saldatura a testa a scintillio\" width=\"380\" height=\"231\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La saldatura a scintillio \u00e8 uno dei metodi di saldatura a contatto ed \u00e8 classificata come\u2026<\/p>","protected":false},"author":1,"featured_media":575,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-svarka-metallov"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One 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