{"id":708,"date":"2019-03-19T20:47:55","date_gmt":"2019-03-19T17:47:55","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=708"},"modified":"2020-11-02T10:11:55","modified_gmt":"2020-11-02T07:11:55","slug":"gazopressovaya-svarka","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/it\/saldatura-a-pressione-di-gas\/","title":{"rendered":"Saldatura a pressione di gas"},"content":{"rendered":"<p><strong>Saldatura a pressione di gas <\/strong>Si riferisce a un tipo di saldatura a pressione in cui le superfici da unire vengono riscaldate con una fiamma ossidrica e poi saldate insieme a forza, senza l&#039;uso di metallo d&#039;apporto. Questo metodo \u00e8 ampiamente utilizzato per unire barre, rotaie e tubi.<\/p>\n<p>Esistono due metodi per effettuare tale saldatura:<\/p>\n<ul>\n<li>Giunto di preriscaldamento e compressione;<\/li>\n<li>Collegamento di uno stato gi\u00e0 plastico con compressione e fusione simultanee.<\/li>\n<\/ul>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>Processo <strong>saldatura a pressione di gas <\/strong>Il processo si svolge come segue: prima della saldatura, le estremit\u00e0 del pezzo devono essere pulite dallo sporco, quindi la superficie deve essere pulita. Il pezzo viene riscaldato intensamente con una torcia ad ugello ad acetilene. Una volta raggiunta la temperatura richiesta, i pezzi vengono pressati insieme e saldati. Il consumo di gas combustibile per il riscaldamento della giunzione di sezioni piene \u00e8 di 1,5 - 2,5 l\/h (mm).<sup>\u00bb<\/sup> per tubi di riscaldamento 1,8 - 2,2 l\/h. mm<sup>\u00bb<\/sup>Le torce riscaldano uniformemente il pezzo saldato e si dividono in a saldare a estremit\u00e0 e a ferro di cavallo, che utilizzano il metodo di fusione. La temperatura di riscaldamento \u00e8 di 1150\u20131250 \u00b0C.<sup>0<\/sup>CON.<\/p>\n<p>Quando <strong>saldatura a pressione di gas <\/strong>Se la saldatura viene eseguita preriscaldando il giunto, si crea prima una fessura tra le parti e si accende la torcia. Il pezzo viene riscaldato fino alla fusione delle estremit\u00e0 e viene applicata una pressione assiale, che ne determina la saldatura. Per garantire la precisione nella saldatura di tubi e barre tonde, questi vengono assemblati per la saldatura.<\/p>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>Anche il minimo disallineamento degli assi influir\u00e0 sulla qualit\u00e0 della saldatura. Nella saldatura in stato plastico, viene applicata una certa pressione ai pezzi pronti per la saldatura e la torcia viene accesa, dopodich\u00e9 i pezzi vengono riscaldati e contemporaneamente compressi. Il segnale per interrompere l&#039;applicazione della pressione \u00e8 la formazione di un ispessimento nel giunto dovuto alla ricalcatura. Un serraggio di alta qualit\u00e0 dei pezzi e la ricalcatura richiedono dispositivi specializzati di varia complessit\u00e0, spesso a controllo idraulico.<\/p>\n<p>Per il processo <strong>saldatura a pressione di gas <\/strong>necessario:<\/p>\n<ul>\n<li>Uno speciale bruciatore multifiamma con decine o addirittura centinaia di fiamme che emanano da canali da 0,5-0,8 mm. Le dimensioni e la configurazione del bruciatore sono personalizzate in base alla forma e alle dimensioni del prodotto;<\/li>\n<li>una miscela infiammabile di acetilene e ossigeno, che produce alte temperature nel metallo, \u00e8 eccellente per questo scopo<\/li>\n<li>dispositivo di serraggio idraulico del pezzo, dispositivi necessari<\/li>\n<\/ul>\n<p>Questo metodo di saldatura viene utilizzato per unire tubi in acciaio per gasdotti e oleodotti con diametri compresi tra 50 e 600 mm. La torcia \u00e8 composta da due semianelli funzionanti in modo indipendente. Il tempo di riscaldamento dipende solo dallo spessore della parete del metallo, non dal suo diametro. Ad esempio, il tempo di riscaldamento per una parete di 6 mm richiede circa 1 minuto, indipendentemente dal suo diametro. Con un processo ben organizzato, un pezzo ben preparato e una calibrazione accurata, il tempo di saldatura pu\u00f2 variare dai 3 ai 5 minuti. Questo metodo consente di ottenere saldature di altissima qualit\u00e0 e precisione, con conseguenti saldature durevoli. Il principale svantaggio di questo metodo di saldatura \u00e8 la natura approssimativa delle caratteristiche (in particolare, il tempo di ricalcatura e la temperatura di riscaldamento sono determinati dall&#039;occhio di un saldatore esperto) e il riscaldamento non uniforme del pezzo. \u00c8 inoltre necessario un ulteriore trattamento termico per conferire le propriet\u00e0 desiderate al metallo in corrispondenza del giunto.<\/p>\n<p>Vantaggi <strong>saldatura a pressione di gas:<\/strong><\/p>\n<ul>\n<li>assenza nel materiale di riempimento;<\/li>\n<li>non c&#039;\u00e8 bisogno di una potente fonte di energia;<\/li>\n<li>la qualit\u00e0 delle cuciture \u00e8 molto alta;<\/li>\n<li>attrezzature poco costose.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-709 aligncenter\" 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(max-width: 337px) 100vw, 337px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La saldatura a pressione di gas \u00e8 un tipo di saldatura a pressione in cui le superfici da unire vengono riscaldate con una fiamma ossidrica,\u2026<\/p>","protected":false},"author":1,"featured_media":710,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-708","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=\"\u0421\u043f\u043e\u0441\u043e\u0431\u044b \u0433\u0430\u0437\u043e\u043f\u0440\u0435\u0441\u0441\u043e\u0432\u043e\u0439 \u0441\u0432\u0430\u0440\u043a\u0438, \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0438 \u043f\u0440\u0435\u043c\u0443\u0449\u0435\u0441\u0442\u0432\u0430 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