{"id":592,"date":"2019-02-18T22:30:55","date_gmt":"2019-02-18T19:30:55","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=592"},"modified":"2020-11-02T11:38:36","modified_gmt":"2020-11-02T08:38:36","slug":"tochechnaya-svarka","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/pt\/soldagem-a-ponto\/","title":{"rendered":"Soldagem a ponto"},"content":{"rendered":"<p><strong>Soldagem a ponto<\/strong> Trata-se de um processo de uni\u00e3o de metais por meio do aquecimento, da passagem de uma corrente el\u00e9trica e da deforma\u00e7\u00e3o da zona fundida por meio de press\u00e3o. O aquecimento ocorre apenas em um ponto espec\u00edfico. Este tipo de uni\u00e3o \u00e9 classificado como soldagem por press\u00e3o. A primeira men\u00e7\u00e3o a este m\u00e9todo de uni\u00e3o de metais remonta a 1877, quando foi proposto pelo inventor russo N.N. Benardos.<\/p>\n<p><strong>Soldagem a ponto<\/strong> \u2014 tamb\u00e9m \u00e9 um tipo de soldagem por contato. Neste m\u00e9todo, dois eletrodos, localizados em lados opostos, conduzem uma corrente el\u00e9trica de 1-200 kA. Unir metais desta forma \u00e9 muito popular. Aproximadamente 301 soldas TP3T s\u00e3o feitas desta forma, e esta porcentagem est\u00e1 aumentando atualmente. <strong> Soldagem a ponto<\/strong> encontra sua aplica\u00e7\u00e3o na engenharia mec\u00e2nica, na ind\u00fastria da avia\u00e7\u00e3o e na fabrica\u00e7\u00e3o de instrumentos.<\/p>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<h2>Tecnologia de soldagem a ponto<\/h2>\n<p><strong>Tecnologia de soldagem a ponto<\/strong> Incorpora os princ\u00edpios da soldagem por contato. O processo de uni\u00e3o ocorre da seguinte forma:<\/p>\n<ul>\n<li>\u2014 os eletrodos de soldagem est\u00e3o localizados em ambos os lados da pe\u00e7a;<\/li>\n<li>- uma corrente el\u00e9trica passa por eles, causando um efeito t\u00e9rmico de acordo com a lei de Joule-Lenz;<\/li>\n<li>- esse efeito t\u00e9rmico entre os eletrodos aquece fortemente a superf\u00edcie do metal e o derrete;<\/li>\n<li>\u2014 \u00e9 formado um n\u00facleo fundido de um ponto de solda com um di\u00e2metro de 4-12 mm, que \u00e9 fortemente comprimido mecanicamente.<\/li>\n<\/ul>\n<p>Isso resulta em uma conex\u00e3o firme entre as superf\u00edcies met\u00e1licas. <strong>Tecnologia de soldagem a ponto<\/strong> A velocidade de soldagem pode chegar a 600 juntas por minuto. As espessuras dos metais variam de 0,02 \u00b5m a 20 mm. Este tipo de soldagem \u00e9 utilizado na ind\u00fastria eletr\u00f4nica. Uma espessura de 20 mm permite seu uso na engenharia agr\u00edcola.<\/p>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<h2>Tecnologia de soldagem a ponto por resist\u00eancia<\/h2>\n<p><strong>Tecnologia de soldagem a ponto por resist\u00eancia<\/strong> A resist\u00eancia da conex\u00e3o \u00e9 determinada pelo tamanho e pela estrutura do ponto de solda. Isso depende principalmente dos seguintes fatores:<\/p>\n<ul>\n<li>\u2014 o tamanho da superf\u00edcie do eletrodo de soldagem;<\/li>\n<li>\u2014 a intensidade da corrente fornecida;<\/li>\n<li>\u2014 tempo de fluxo atrav\u00e9s da pe\u00e7a de trabalho;<\/li>\n<li>\u2014 o estado da superf\u00edcie da pe\u00e7a de trabalho e a magnitude da for\u00e7a de compress\u00e3o.<\/li>\n<\/ul>\n<p><strong>Tecnologia de soldagem a ponto por resist\u00eancia<\/strong> tem diferentes modos de unir metais.<\/p>\n<p>1. Modo suave.<\/p>\n<p>O tempo de soldagem \u00e9 ligeiramente maior. Correntes moderadas aquecem suavemente a superf\u00edcie met\u00e1lica com uma corrente moderada, n\u00e3o excedendo 100 A\/mm na superf\u00edcie de trabalho.<sup>2<\/sup>O fluxo de corrente normalmente dura de 0,5 a 3 segundos. O consumo de energia neste modo \u00e9 muito menor do que no modo r\u00edgido. As m\u00e1quinas de solda s\u00e3o mais baratas porque n\u00e3o requerem uma grande carga el\u00e9trica. A zona de solda n\u00e3o sofre endurecimento significativo, portanto, este modo \u00e9 adequado para soldar a\u00e7os propensos a endurecimento.<\/p>\n<p>2. Modo estrito.<\/p>\n<p>Neste modo, o tempo de soldagem \u00e9 muito menor do que no modo suave. Isso \u00e9 facilitado pela maior corrente utilizada. Sua densidade \u00e9 de 120-300 A\/mm.<sup>2<\/sup> ao soldar a\u00e7o. A press\u00e3o dos eletrodos de soldagem \u00e9 de 3-8 kg\/mm<sup>2<\/sup> A vaz\u00e3o de corrente \u00e9 normalmente de 0,1 a 1,5 segundos. M\u00e1quinas de solda que operam neste modo sofrem uma carga el\u00e9trica significativa, resultando em um consumo de energia significativamente maior. Uma vantagem significativa deste modo \u00e9 o aumento da produtividade e a redu\u00e7\u00e3o do tempo de soldagem. Este m\u00e9todo \u00e9 adequado para unir a\u00e7os de alta liga, pe\u00e7as de espessuras variadas e pe\u00e7as diferentes. Metais com alta condutividade t\u00e9rmica, como alum\u00ednio e cobre, e suas ligas, tamb\u00e9m s\u00e3o excelentes soldadores.<\/p>\n<p>Por isso, <strong>tecnologia de soldagem a ponto por resist\u00eancia<\/strong> permite unir diferentes metais com resist\u00eancia e velocidade de soldagem suficientes.<\/p>\n<p><strong><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-594 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0422\u043e\u0447\u0435\u0447\u043d\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430.webp\" alt=\"Diagrama de soldagem a ponto\" width=\"660\" height=\"398\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0422\u043e\u0447\u0435\u0447\u043d\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430.webp 660w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0422\u043e\u0447\u0435\u0447\u043d\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430-300x181.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/02\/\u0422\u043e\u0447\u0435\u0447\u043d\u0430\u044f-\u0441\u0432\u0430\u0440\u043a\u0430-\u0441\u0445\u0435\u043c\u0430-254x153.webp 254w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/strong><\/p>\n<p><b>\u00a0<\/b><\/p>","protected":false},"excerpt":{"rendered":"<p>A soldagem a ponto \u00e9 um processo de uni\u00e3o de metais por meio do aquecimento com corrente passando por eles e\u2026<\/p>","protected":false},"author":1,"featured_media":593,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-592","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=\"\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0442\u043e\u0447\u0435\u0447\u043d\u043e\u0439 \u0441\u0432\u0430\u0440\u043a\u0438, \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u0445 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a \u0438 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0435\u0439\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" 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