{"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\/pt\/soldagem-a-pressao-de-gas\/","title":{"rendered":"Soldagem a press\u00e3o de g\u00e1s"},"content":{"rendered":"<p><strong>Soldagem a press\u00e3o de g\u00e1s <\/strong>Trata-se de um tipo de soldagem por press\u00e3o em que as superf\u00edcies a serem unidas s\u00e3o aquecidas com uma chama de oxicombust\u00edvel e, em seguida, soldadas \u00e0 for\u00e7a, sem o uso de metal de adi\u00e7\u00e3o. Este m\u00e9todo \u00e9 amplamente utilizado para unir barras, trilhos e tubos.<\/p>\n<p>Existem dois m\u00e9todos de soldagem:<\/p>\n<ul>\n<li>Pr\u00e9-aquecimento e compress\u00e3o da junta;<\/li>\n<li>A conex\u00e3o de um estado j\u00e1 pl\u00e1stico com compress\u00e3o e fus\u00e3o simult\u00e2neas.<\/li>\n<\/ul>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>Processo <strong>soldagem a press\u00e3o de g\u00e1s <\/strong>O processo ocorre da seguinte forma: antes da soldagem, as extremidades da pe\u00e7a devem ser limpas de sujeira e, em seguida, a superf\u00edcie deve ser limpa. A pe\u00e7a \u00e9 aquecida fortemente com um ma\u00e7arico com bico de acetileno. Uma vez atingida a temperatura desejada, as pe\u00e7as s\u00e3o prensadas e soldadas. O consumo de g\u00e1s combust\u00edvel para aquecer a junta de se\u00e7\u00f5es s\u00f3lidas \u00e9 de 1,5 a 2,5 l\/h (mm).<sup>\u00bb<\/sup> para tubos de aquecimento 1,8 - 2,2 l\/h. mm<sup>\u00bb<\/sup>As tochas aquecem uniformemente a pe\u00e7a soldada e s\u00e3o divididas em tipo ponta e tipo ferradura, que utilizam o m\u00e9todo de fus\u00e3o. A temperatura de aquecimento \u00e9 de 1150\u20131250 \u00b0C.<sup>0<\/sup>COM.<\/p>\n<p>Quando <strong>soldagem a press\u00e3o de g\u00e1s <\/strong>Se a soldagem for realizada por pr\u00e9-aquecimento da junta, primeiro \u00e9 criada uma folga entre as pe\u00e7as e a tocha \u00e9 acesa. A pe\u00e7a de trabalho \u00e9 aquecida at\u00e9 que as extremidades derretam e a press\u00e3o axial \u00e9 aplicada, causando a soldagem. Para garantir a precis\u00e3o na soldagem de tubos e barras redondas, eles s\u00e3o montados para soldagem.<\/p>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>Mesmo o menor desalinhamento dos eixos afetar\u00e1 a qualidade da solda. Ao soldar em estado pl\u00e1stico, uma certa press\u00e3o \u00e9 aplicada \u00e0s pe\u00e7as prontas para soldagem e a tocha \u00e9 acesa, ap\u00f3s o que as pe\u00e7as s\u00e3o aquecidas e simultaneamente comprimidas. O sinal para interromper a aplica\u00e7\u00e3o de press\u00e3o \u00e9 a forma\u00e7\u00e3o de um espessamento na junta devido ao recalque. A fixa\u00e7\u00e3o e o recalque de alta qualidade das pe\u00e7as exigem dispositivos especializados de complexidade vari\u00e1vel, frequentemente controlados hidraulicamente.<\/p>\n<p>Para o processo <strong>soldagem a press\u00e3o de g\u00e1s <\/strong>necess\u00e1rio:<\/p>\n<ul>\n<li>Um queimador multichamas especial com dezenas ou at\u00e9 centenas de chamas emanadas de canais de 0,5 a 0,8 mm. O tamanho e a configura\u00e7\u00e3o do queimador s\u00e3o adaptados ao formato e ao tamanho do produto;<\/li>\n<li>uma mistura inflam\u00e1vel de acetileno e oxig\u00eanio, que produz altas temperaturas no metal, \u00e9 excelente para esse prop\u00f3sito<\/li>\n<li>dispositivo de fixa\u00e7\u00e3o de pe\u00e7as hidr\u00e1ulicas, dispositivos necess\u00e1rios<\/li>\n<\/ul>\n<p>Este m\u00e9todo de soldagem \u00e9 usado para unir tubos de a\u00e7o para gasodutos e oleodutos com di\u00e2metros de 50 a 600 mm. A tocha consiste em dois meios-an\u00e9is operando independentemente. O tempo de aquecimento depende apenas da espessura da parede do metal, n\u00e3o do seu di\u00e2metro. Por exemplo, o tempo de aquecimento para uma parede de 6 mm leva aproximadamente 1 minuto, independentemente do seu di\u00e2metro. Quando o processo \u00e9 bem organizado, a pe\u00e7a est\u00e1 bem preparada e calibrada com precis\u00e3o, o tempo de soldagem pode variar de 3 a 5 minutos. Este m\u00e9todo permite um trabalho de alt\u00edssima qualidade e precis\u00e3o, resultando em soldas dur\u00e1veis. A principal desvantagem deste m\u00e9todo de soldagem \u00e9 a natureza aproximada das caracter\u00edsticas \u2014 ou seja, o tempo de recalque e a temperatura de aquecimento s\u00e3o determinados pelo olhar de um soldador experiente \u2014 e o aquecimento irregular da pe\u00e7a de trabalho. Tratamento t\u00e9rmico adicional tamb\u00e9m \u00e9 necess\u00e1rio para conferir as propriedades desejadas ao metal na junta.<\/p>\n<p>Vantagens <strong>soldagem a press\u00e3o de g\u00e1s:<\/strong><\/p>\n<ul>\n<li>aus\u00eancia no material de enchimento;<\/li>\n<li>n\u00e3o h\u00e1 necessidade de uma fonte de energia potente;<\/li>\n<li>a qualidade das costuras \u00e9 muito alta;<\/li>\n<li>equipamento barato.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-709 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0433\u0430\u0437\u043e\u043f\u0440\u0435\u0441\u0441\u043e\u0432\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430.webp\" alt=\"Diagrama de soldagem por press\u00e3o de g\u00e1s\" width=\"337\" height=\"149\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0433\u0430\u0437\u043e\u043f\u0440\u0435\u0441\u0441\u043e\u0432\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430.webp 337w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0433\u0430\u0437\u043e\u043f\u0440\u0435\u0441\u0441\u043e\u0432\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430-300x133.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/03\/\u0433\u0430\u0437\u043e\u043f\u0440\u0435\u0441\u0441\u043e\u0432\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430-254x112.webp 254w\" sizes=\"auto, (max-width: 337px) 100vw, 337px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>A soldagem a g\u00e1s sob press\u00e3o refere-se a um tipo de soldagem a press\u00e3o na qual as superf\u00edcies a serem unidas s\u00e3o aquecidas com uma chama de oxi-combust\u00edvel,\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 \u0441\u0432\u0430\u0440\u043a\u0438.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Dimon@1873\"\/>\n\t<link rel=\"canonical\" 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