{"id":197,"date":"2018-01-10T22:15:44","date_gmt":"2018-01-10T19:15:44","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=197"},"modified":"2020-11-02T11:54:38","modified_gmt":"2020-11-02T08:54:38","slug":"elektrodugovaya-svarka-metalla","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/saldatura-ad-arco-elettrico-dei-metalli\/","title":{"rendered":"Saldatura ad arco elettrico dei metalli"},"content":{"rendered":"<p><strong>Saldatura ad arco elettrico dei metalli <\/strong>La saldatura ad arco \u00e8 un metodo di saldatura dei metalli che prevede il riscaldamento e la fusione del metallo con un arco elettrico. \u00c8 uno dei metodi di saldatura pi\u00f9 comuni. Fu scoperto per la prima volta dallo scienziato N.G. Slavyanov nel 1888. Utilizzava un elettrodo metallico consumabile. La saldatura avveniva sotto uno strato di flusso. <strong>Saldatura ad arco elettrico dei metalli <\/strong>Viene eseguita utilizzando corrente continua. Il terminale positivo si trova sul pezzo da saldare e il terminale negativo sull&#039;elettrodo. La saldatura elettrica pu\u00f2 essere eseguita con un elettrodo consumabile o non consumabile. Questo metodo di saldatura \u00e8 ampiamente utilizzato in lavori di riparazione, installazione, ingegneria meccanica, edilizia e altri settori.<\/p>\n<h2>Saldatura ad arco elettrico con elettrodo 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 elettrico con elettrodo consumabile <\/strong>Il processo prevede la fusione della superficie metallica e dell&#039;elettrodo. L&#039;elettrodo funge da materiale per la saldatura. Per prevenire l&#039;ossidazione della saldatura, vengono utilizzati gas come elio, argon, anidride carbonica e le loro miscele. Durante la saldatura, questi gas vengono forniti dalla testa di saldatura. Gli elementi facilmente ionizzabili presenti nell&#039;elettrodo rendono l&#039;arco elettrico pi\u00f9 stabile. Tali elementi possono includere sodio, potassio e calcio. Il vantaggio della saldatura a corrente continua \u00e8 che la saldatura \u00e8 pi\u00f9 pulita. Ci\u00f2 \u00e8 dovuto al fatto che la quantit\u00e0 di spruzzi prodotta durante la fusione dell&#039;elettrodo \u00e8 minima. <strong>Saldatura ad arco elettrico del metallo con elettrodo consumabile<\/strong> include:<\/p>\n<ul>\n<li>Preparazione della superficie metallica da saldare. Pulizia da sporco e macchie d&#039;olio;<\/li>\n<li>Per formare un arco di saldatura, la corrente elettrica viene fornita all&#039;elettrodo e al pezzo in lavorazione;<\/li>\n<li>Si forma un arco. Raggiunge i 7000 <sup>0<\/sup>C e inizia a fondere il metallo;<\/li>\n<li>Un bagno di saldatura si forma tra l&#039;elettrodo fuso e la superficie metallica. La scoria risale in superficie e forma una pellicola protettiva. La saldatura si solidifica, formando un giunto saldato.<\/li>\n<\/ul>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>Nella saldatura con elettrodo consumabile in gas di protezione, il filo di saldatura ha una composizione chimica simile a quella del metallo da saldare. Per la saldatura di metalli non ferrosi e delle loro leghe vengono utilizzati gas inerti come elio, argon e le loro miscele.<\/p>\n<p>I parametri della corrente influenzano la profondit\u00e0 di penetrazione. Aumentando la corrente si penetra pi\u00f9 in profondit\u00e0 nel metallo, mentre diminuendola si ottiene l&#039;effetto opposto. L&#039;intensit\u00e0 della corrente non influenza la larghezza della saldatura, ma il tipo di corrente s\u00ec. La saldatura risulta pi\u00f9 stretta quando si utilizza corrente continua.<\/p>\n<p>Anche l&#039;arco di saldatura influisce sulla qualit\u00e0 della saldatura. Pi\u00f9 piccolo \u00e8 l&#039;arco, pi\u00f9 pulita sar\u00e0 la saldatura. Il metallo fonde uniformemente e il numero di gocce metalliche si riduce significativamente. Ci\u00f2 consente una penetrazione pi\u00f9 profonda. <strong>Saldatura ad arco elettrico del metallo con elettrodo consumabile <\/strong>ha i suoi vantaggi:<\/p>\n<ul>\n<li>la capacit\u00e0 di saldare in qualsiasi luogo e in qualsiasi posizione;<\/li>\n<li>\u00c8 possibile saldare un&#039;ampia variet\u00e0 di tipi di acciaio;<\/li>\n<li>La saldatura \u00e8 piuttosto semplice e facile da trasportare.<\/li>\n<\/ul>\n<p>Svantaggi di questo metodo di saldatura:<\/p>\n<ul>\n<li>nocivit\u00e0 dei gas durante il lavoro;<\/li>\n<li>bassa efficienza e, rispetto ad altri tipi di saldatura, bassa produttivit\u00e0;<\/li>\n<\/ul>\n<p>La qualit\u00e0 della saldatura dipende dalle qualifiche del saldatore.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-198 size-full aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2018\/01\/technologiya_svarki_111.webp\" alt=\"Saldatura ad arco elettrico del metallo con elettrodo consumabile\" width=\"522\" height=\"298\" 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