Электродуговая сварка – наиболее распространенный и универсальный метод надежного соединения металлических деталей. Технология этого процесса сводится к образованию между электродом и основным металлом электрической дуги за счет тока, генерируемого сварочным аппаратом. Горящая обмазка электрода выделяет газ, препятствующий проникновению воздуха в область контакта дуги с металлом. Этот газ раскален настолько, что плавит металл, причем материал электрода также переходит в расплавленную сварочную ванну, формирующуюся вокруг шва.
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Основной задачей любого сварочного аппарата является обеспечение большого регулируемого постоянного либо переменного тока, текущего через электрод. Сварка постоянным током посредством сварочного инвертора имеет ряд преимуществ. Используемое оборудование легче, имеет меньшие габариты, чем сварочные трансформаторы переменного тока, и менее чувствительно к перепадам напряжения в сети.
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Все методы сварки инвертором основаны на том, что поток электронов течет в одном направлении, выбрать которое он и позволяет. Обратная полярность установлена, когда при сварке плюс находится на электроде, а минусом служит заземление. Электроны всегда текут от отрицательного контакта к положительному, то есть при обратной полярности – из металла переходят на электрод, вызывая сильный нагрев последнего. Это основной метод обычной дуговой сварки. При установке прямой полярности минус будет на электроде, а положительным контактом служит «земля». Электроны текут с электрода на металл, разогревая его и оставляя электрод холодным. Этот метод применяется для ускоренной сварки специальными электродами листового металла.
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28.07.2017 at 11:57 ппПри оптимальном соответствии силы тока и скорости шов получается в меру выпуклый и красивый, обеспечивает требуемую глубину провара свариваемых кромок. Типовой является обратная полярность при сварке инвертором, так как предполагается сваривание тонких металлических листов, а их легко прожечь.
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