{"id":627,"date":"2019-03-03T09:06:46","date_gmt":"2019-03-03T06:06:46","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=627"},"modified":"2020-11-02T10:18:52","modified_gmt":"2020-11-02T07:18:52","slug":"vozdushno-dugovaya-rezka-metalla","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/pt\/corte-de-metal-por-arco-de-ar\/","title":{"rendered":"Corte de metal por arco de ar"},"content":{"rendered":"<p>Princ\u00edpio de funcionamento em <strong>corte a arco de ar <\/strong>Este processo envolve a fus\u00e3o do metal no ponto de corte com um arco el\u00e9trico e a remo\u00e7\u00e3o do metal fundido com ar comprimido sob a a\u00e7\u00e3o do arco de fus\u00e3o. O ar \u00e9 fornecido por meio de um eletrodo n\u00e3o consum\u00edvel fixado em um porta-eletrodo. Os eletrodos utilizados neste processo s\u00e3o normalmente de grafite ou carbono.<\/p>\n<p><strong>Corte a arco de ar com eletrodo de carbono <\/strong>Com di\u00e2metro de 6 a 12 mm, permite o m\u00e1ximo aumento de produtividade, com corrente de soldagem de 300 a 1500 A e tens\u00e3o do arco mantida por corrente cont\u00ednua de polaridade reversa. Durante a opera\u00e7\u00e3o, o arco apresenta baixa estabilidade e interrup\u00e7\u00f5es frequentes. <strong>corte a arco de ar <\/strong>Leva-se em considera\u00e7\u00e3o que quanto menor a taxa de desgaste do eletrodo, mais eficiente \u00e9 o processo de corte. Portanto, \u00e9 mais aconselh\u00e1vel utilizar eletrodos com uma camada protetora e de al\u00edvio de cobre ou uma composi\u00e7\u00e3o \u00e0 base de cobre.<\/p>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>Talvez uma desvantagem significativa <strong>corte a arco de ar <\/strong>A m\u00e1 qualidade da superf\u00edcie de corte \u00e9 um sinal de baixa qualidade. Por exemplo, em bordas com profundidade de 0,1-0,3 mm, observam-se trincas, causadas pelo aumento do teor de carbono. Para reduzir a porcentagem de cementa\u00e7\u00e3o, \u00e9 melhor evitar tocar o metal quente com o eletrodo durante a soldagem, se poss\u00edvel. Ap\u00f3s o corte, certifique-se de limpar bem a superf\u00edcie com uma escova at\u00e9 que adquira um brilho met\u00e1lico e inspecione-a para verificar poss\u00edveis defeitos.<\/p>\n<p><strong>Corte a arco de ar <\/strong>\u00c9 frequentemente utilizado para tratamento de superf\u00edcies, como separa\u00e7\u00e3o de sucata de a\u00e7o, alum\u00ednio, cobre e tit\u00e2nio. Pode cortar a\u00e7os de liga e alta liga, a\u00e7o carbono, ferro fundido e alguns metais n\u00e3o ferrosos, como bronze, lat\u00e3o, alum\u00ednio e ligas. Quando realizado corretamente, o metal fundido \u00e9 completamente removido e a superf\u00edcie met\u00e1lica permanece inalterada em composi\u00e7\u00e3o, gra\u00e7as ao breve per\u00edodo de aquecimento.<\/p>\n<p><strong>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/strong><\/p>\n<p><strong>Corte a arco de ar com eletrodo de carbono <\/strong>Este processo \u00e9 realizado com corrente cont\u00ednua (CC) e \u00e9 utilizado para cortar ferro fundido, metais n\u00e3o ferrosos e a\u00e7o. No entanto, ao trabalhar com este eletrodo, a largura e a qualidade do corte n\u00e3o s\u00e3o muito confi\u00e1veis. O corte tamb\u00e9m pode ser feito com CA, desde que a superf\u00edcie esteja posicionada em um leve \u00e2ngulo em rela\u00e7\u00e3o ao plano horizontal para permitir o escoamento do metal l\u00edquido. Com uma espessura de eletrodo de carbono de 10 mm e uma espessura de metal de 6 mm, a corrente ser\u00e1 de 400 dB e a velocidade de corte ser\u00e1 de 21 m\/h. Com uma espessura de metal de 16 mm, a velocidade ser\u00e1 significativamente menor: 10,5 m\/h.<\/p>\n<p><strong>Equipamentos para soldagem a arco de ar <\/strong>Uma tocha de soldagem consiste em um dispositivo de partida, uma fonte de alimenta\u00e7\u00e3o obrigat\u00f3ria, um cabo de soldagem, uma mangueira de suprimento de ar, uma tocha de corte e um compressor de ar. Em uma oficina, a mangueira de suprimento de ar \u00e9 conectada ao duto de ar local. Na constru\u00e7\u00e3o civil, a tocha de corte RVD (23.7) \u00e9 comumente utilizada. Ela consiste em um pequeno corpo com uma al\u00e7a, uma v\u00e1lvula de ar que se conecta \u00e0 al\u00e7a, um cabo e uma mangueira. Ela tamb\u00e9m possui garras met\u00e1licas m\u00f3veis e fixas que prendem o eletrodo de carbono.<\/p>\n<p><strong><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-629 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0412\u043e\u0437\u0434\u0443\u0448\u043d\u043e-\u0434\u0443\u0433\u043e\u0432\u0430\u044f-\u0440\u0435\u0437\u043a\u0430-\u043c\u0435\u0442\u0430\u043b\u043b\u0430-\u0441\u0445\u0435\u043c\u0430.webp\" alt=\"Diagrama de corte de metal por arco de ar\" width=\"644\" height=\"377\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0412\u043e\u0437\u0434\u0443\u0448\u043d\u043e-\u0434\u0443\u0433\u043e\u0432\u0430\u044f-\u0440\u0435\u0437\u043a\u0430-\u043c\u0435\u0442\u0430\u043b\u043b\u0430-\u0441\u0445\u0435\u043c\u0430.webp 644w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0412\u043e\u0437\u0434\u0443\u0448\u043d\u043e-\u0434\u0443\u0433\u043e\u0432\u0430\u044f-\u0440\u0435\u0437\u043a\u0430-\u043c\u0435\u0442\u0430\u043b\u043b\u0430-\u0441\u0445\u0435\u043c\u0430-300x176.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0412\u043e\u0437\u0434\u0443\u0448\u043d\u043e-\u0434\u0443\u0433\u043e\u0432\u0430\u044f-\u0440\u0435\u0437\u043a\u0430-\u043c\u0435\u0442\u0430\u043b\u043b\u0430-\u0441\u0445\u0435\u043c\u0430-254x149.webp 254w\" sizes=\"auto, (max-width: 644px) 100vw, 644px\" \/><\/strong><\/p>\n<p><b>\u00a0<\/b><\/p>","protected":false},"excerpt":{"rendered":"<p>O princ\u00edpio de opera\u00e7\u00e3o no corte a arco de ar \u00e9 a fus\u00e3o do metal no ponto de corte\u2026<\/p>","protected":false},"author":1,"featured_media":628,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-rezka-metallov"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e\u0437\u0434\u0443\u0448\u043d\u043e-\u0434\u0443\u0433\u043e\u0432\u0430\u044f \u0440\u0435\u0437\u043a\u0430 \u043c\u0435\u0442\u0430\u043b\u043b\u0430, \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430, \u0435\u0433\u043e \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0445 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a \u0438 \u0443\u0441\u043b\u043e\u0432\u0438\u0439 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