{"id":212,"date":"2018-01-15T22:57:12","date_gmt":"2018-01-15T19:57:12","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=212"},"modified":"2020-11-02T11:51:16","modified_gmt":"2020-11-02T08:51:16","slug":"stykovaya-svarka-detalej-bez-oplavleniya","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/saldatura-di-testa-di-parti-senza-riscaldamento\/","title":{"rendered":"Saldatura di testa di parti senza fusione"},"content":{"rendered":"<p>Processo di saldatura <strong>senza sciogliersi <\/strong>\u00e8 uno dei metodi di saldatura di testa. Appartiene alla categoria della saldatura a pressione. Il metodo di saldatura si basa su <strong>senza sciogliersi <\/strong>Si sfrutta l&#039;effetto termico della corrente elettrica, basato sulla legge di Joule-Lenz, e la conseguente compressione dei pezzi saldati. La sezione trasversale dei pezzi saldati in questo modo raggiunge i 200 mm.<sup>2<\/sup> e viene utilizzato per unire fili, tubi di acciaio a basso tenore di carbonio di piccola sezione e barre. Questo tipo di saldatura \u00e8 adatto per acciai strutturali bassolegati e acciai a basso tenore di carbonio. Saldatura a contatto <strong>senza sciogliersi <\/strong>Viene utilizzato con successo per le leghe di rame e di alluminio, il che conferisce a questo metodo un&#039;ampia gamma di applicazioni.<\/p>\n<h2>Metodo di saldatura dei giunti di testa<\/h2>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>C diverso<strong>metodo di saldatura dei giunti di testa\u00a0<\/strong>Due metodi consentono il processo tecnologico di saldatura dei metalli resistente e di alta qualit\u00e0. Uno \u00e8 il metodo a fusione, l&#039;altro \u00e8 la saldatura senza fusione. La saldatura senza fusione, nota anche come saldatura a resistenza, prevede il riscaldamento intenso del pezzo e la successiva pressione verso il basso, interrompendo contemporaneamente la corrente. <strong>CON<\/strong><strong>metodo di saldatura dei giunti di testa\u00a0<\/strong>Il metodo di resistenza (senza fusione) prevede fasi sequenziali di preparazione delle parti e di loro unione:<\/p>\n<ul>\n<li>Per garantire una saldatura di successo, la superficie da unire deve essere accuratamente pulita da sporco e ossidazione. Eventuali imperfezioni o rugosit\u00e0 superficiali devono essere rimosse, poich\u00e9 ci\u00f2 impedirebbe un riscaldamento uniforme. La pulizia \u00e8 particolarmente importante se la superficie \u00e8 ampia. Se le estremit\u00e0 non sono sigillate ermeticamente, si verificher\u00e0 l&#039;ossidazione del metallo sulla superficie del giunto.<\/li>\n<li>I pezzi vengono quindi posizionati in morsetti per elettrodi e compressi. La forza di compressione \u00e8 significativamente maggiore rispetto alla saldatura per fusione. Ci\u00f2 garantisce un riscaldamento superficiale ottimale;<\/li>\n<li>Una corrente elettrica viene fatta passare attraverso il metallo, causando una rapida generazione di calore alle estremit\u00e0 dei componenti. Si verifica una deformazione plastica e l&#039;area di contatto elettrico aumenta. Di conseguenza, la resistenza complessiva scende a zero. Il metallo viene riscaldato a una temperatura di 0,8-0,9 T p.l. (T p.l. \u00e8 il punto di fusione del metallo). A questa temperatura, gli ossidi sono presenti sulla superficie del metallo solido. L&#039;estrusione degli ossidi non avviene completamente;<\/li>\n<li>Inizia la compressione attuale, cio\u00e8 il metallo viene espulso dal giunto;<\/li>\n<li>Segue la ricalcatura senza corrente. La pressione pu\u00f2 aumentare o rimanere uguale alla pressione di riscaldamento, a seconda del tipo di metallo. La ricalcatura deve essere di dimensioni ottimali e localizzata nell&#039;area del giunto, consentendo l&#039;espulsione del metallo surriscaldato e degli ossidi. Si forma una bava attorno al giunto.<\/li>\n<\/ul>\n<p><strong>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/strong><\/p>\n<p><strong>Metodo di saldatura dei giunti di testa <\/strong>Si differenziano per il fatto che la pressione \u00e8 il fattore principale nella formazione dei legami metallici in un giunto saldato. Il processo di fusione del metallo favorisce la ricristallizzazione del metallo nel giunto.<\/p>\n<h3>Saldatura di testa a contatto GOST<\/h3>\n<p>La normazione definisce le condizioni per l&#039;esecuzione di lavori di saldatura con il metodo della saldatura di testa a resistenza e a fusione.<strong>Saldatura di testa a contatto OST\u00a0<\/strong>specifica definizioni e termini secondo ISO 15607 e ISO 6520-2. Le specifiche preliminari per il processo di saldatura di testa devono essere sviluppate in conformit\u00e0 con ISO 15609-5.<strong>Saldatura di testa a contatto OST<\/strong>\u00a0ha requisiti specifici per la verifica delle saldature di prova. La certificazione dei dispositivi di saldatura a resistenza \u00e8 conforme alla norma GOST EN 1418. La norma attuale contiene requisiti per il processo di saldatura a resistenza in conformit\u00e0 alla norma ISO 4063. <strong>G<\/strong><strong>Saldatura di testa a contatto OST\u00a0<\/strong>R ISO 15614-13 e GOST R ISO 15614-14 contengono una serie di riferimenti normativi agli standard internazionali per la saldatura di testa.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-214 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/stykovaja.webp\" alt=\"Metodi di saldatura dei giunti di testa\" width=\"500\" height=\"300\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/stykovaja.webp 500w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/stykovaja-300x180.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/stykovaja-254x152.webp 254w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-213 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/1345549438_untitled.fr11-1.webp\" alt=\"Saldatura di testa di parti senza fusione\" width=\"338\" height=\"315\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/1345549438_untitled.fr11-1.webp 338w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/1345549438_untitled.fr11-1-300x280.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/1345549438_untitled.fr11-1-204x190.webp 204w\" sizes=\"auto, (max-width: 338px) 100vw, 338px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La saldatura di testa senza flash \u00e8 un tipo di saldatura di testa a resistenza. \u00c8 classificata come\u2026<\/p>","protected":false},"author":1,"featured_media":214,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-212","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-svarka-metallov"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u0432 \u0441\u0432\u0430\u0440\u043a\u0438 \u0441\u0442\u044b\u043a\u043e\u0432\u044b\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 \u0431\u0435\u0437 \u043e\u043f\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u044f, \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f \u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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