{"id":193,"date":"2018-01-09T22:05:42","date_gmt":"2018-01-09T19:05:42","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=193"},"modified":"2020-11-02T11:55:17","modified_gmt":"2020-11-02T08:55:17","slug":"elektrodugovaya-svarka-neplavyashhimsya-elektrodom","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/saldatura-ad-arco-non-consumabile\/","title":{"rendered":"Saldatura ad arco con elettrodi non consumabili"},"content":{"rendered":"<p><strong>Saldatura ad arco<\/strong> Si tratta di un classico processo di saldatura dei metalli che utilizza un arco elettrico per riscaldare e fondere la superficie metallica. La temperatura dell&#039;arco \u00e8 sufficientemente elevata, fino a 7000 <sup>\u00b0<\/sup> C, da fondere metalli di diversa durezza. Gi\u00e0 nel 1802, gli scienziati scoprirono il fenomeno dell&#039;arco elettrico ad alta temperatura. E nel 1882, lo scienziato N.N. Benardos invent\u00f2 e brevett\u00f2 la saldatura elettrica, utilizzando un elettrodo di carbonio. <strong>Saldatura ad arco<\/strong> Esistono due tipi di saldatura: una con elettrodo consumabile e una con elettrodo non consumabile. Il metodo non consumabile utilizza un materiale resistente alle alte temperature. I materiali adatti a questo scopo includono elettrodi di tungsteno, carbonio o grafite.<\/p>\n<h2>Principi fondamentali della saldatura ad arco elettrico con elettrodo non consumabile<\/h2>\n<p><strong>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<\/strong><\/p>\n<p><strong>Saldatura ad arco con elettrodi non consumabili <\/strong>Ci\u00f2 consente di mantenere un&#039;elevata stabilit\u00e0 dell&#039;arco, indipendentemente dal tipo di corrente. Inoltre, regolando la velocit\u00e0 di avanzamento e l&#039;angolazione dell&#039;elettrodo, e selezionando la qualit\u00e0 del filo d&#039;apporto, \u00e8 possibile modificare la composizione chimica della saldatura e i suoi parametri geometrici. <strong>Saldatura ad arco con elettrodi non consumabili<\/strong> Ha un&#039;ampia gamma di applicazioni per la saldatura di vari metalli. Salda con successo:<\/p>\n<ul>\n<li>acciai al carbonio, bassolegati e altolegati;<\/li>\n<li>acciai e leghe resistenti al calore;<\/li>\n<li>metalli non ferrosi e loro leghe.<\/li>\n<\/ul>\n<p>Le tecnologie di saldatura per diversi tipi di metallo variano nelle loro specifiche, ma i parametri di base sono simili. Ad esempio, la tecnologia per la saldatura di acciai al carbonio e bassolegati:<\/p>\n<ul>\n<li>Il pezzo in lavorazione viene accuratamente pulito da incrostazioni, ruggine e sporco. Ci\u00f2 garantisce un buon contatto tra l&#039;elettrodo e la superficie metallica da saldare;<\/li>\n<li>Vengono selezionati i parametri di corrente. In genere si utilizza corrente continua con polarit\u00e0 diretta. L&#039;elettrodo \u00e8 il terminale negativo e il pezzo in lavorazione \u00e8 il terminale positivo. La tensione viene calcolata per un elettrodo di tungsteno di 1 mm di diametro, con una tensione di 30-35 A. L&#039;arco di saldatura deve essere breve. Questo favorisce una penetrazione profonda.<\/li>\n<li>La saldatura viene eseguita con l&#039;angolo rivolto in avanti. Gli acciai di grado 10 e 20 vengono saldati solo con filo d&#039;apporto, altrimenti la saldatura potrebbe diventare porosa. Per prevenire schizzi di metallo d&#039;apporto e l&#039;ossidazione della punta del filo, evitare movimenti bruschi del filo.<\/li>\n<\/ul>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Elettrodo di carbonio<\/h3>\n<p>Quando si salda con un elettrodo di questo tipo, la combustione e la successiva evaporazione dell&#039;elettrodo creano un ambiente protettivo, creando un&#039;atmosfera unica contenente CO.<sub>2<\/sub>, CO e vapori di carbonio. Tuttavia, per la saldatura di parti critiche, vengono utilizzati mezzi aggiuntivi per migliorare la protezione gassosa del metallo da saldare. La saldatura con elettrodi di carbonio viene utilizzata per il riporto e la saldatura di: acciaio, ghisa, leghe dure e metalli non ferrosi.<\/p>\n<h4>Elettrodo di tungsteno<\/h4>\n<p>Gli elettrodi di tungsteno sono pi\u00f9 comunemente utilizzati rispetto agli elettrodi di carbonio. Sono piuttosto resistenti all&#039;usura. Il consumo di elettrodo \u00e8 di 1-2 cm per ora di arco. Per prevenire la rapida ossidazione dell&#039;elettrodo, operano in un gas di protezione. A questo scopo vengono utilizzati elio e argon; non reagiscono con il tungsteno. Questo elettrodo pu\u00f2 unire efficacemente lamiere fino a 6 mm di spessore, cos\u00ec come lamiere molto sottili (inferiori a 0,1 mm). Il cordone di saldatura \u00e8 pulito. <strong>Saldatura ad arco con elettrodi non consumabili <\/strong>consente la saldatura di alta qualit\u00e0 di parti realizzate in metalli altamente attivi e refrattari.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-195 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/image330.webp\" alt=\"Saldatura ad arco di carbonio\" width=\"280\" height=\"172\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/image330.webp 280w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/image330-254x156.webp 254w\" sizes=\"auto, (max-width: 280px) 100vw, 280px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-194 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/GTAW-ru.webp\" alt=\"Saldatura ad arco con elettrodi non consumabili\" width=\"625\" height=\"350\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/GTAW-ru.webp 625w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/GTAW-ru-300x168.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/GTAW-ru-254x142.webp 254w\" sizes=\"auto, (max-width: 625px) 100vw, 625px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La saldatura ad arco \u00e8 un metodo classico di saldatura dei metalli, che utilizza uno speciale processo chiamato saldatura ad arco per riscaldare la superficie del metallo e fonderla...<\/p>","protected":false},"author":1,"featured_media":194,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-193","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 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