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Catalogue

HF zapalování

HF zapalování je označení pro vysokofrekvenční start svařovacího oblouku. Jedná se o bezdotykovou metodu, kdy se pro zahájení svařování nemusí wolframová elektroda dotknout svařovaného materiálu. Svářečka vybavená touto funkcí vygeneruje krátký vysokonapěťový impuls, který způsobí, že mezi hrotem elektrody a materiálem přeskočí jiskra. Tato jiskra vytvoří v ochranné atmosféře plynu vodivou dráhu, kterou okamžitě začne protékat hlavní svařovací proud, čímž dojde k zapálení stabilního oblouku. Hlavní přínos této technologie spočívá v zamezení kontaminace wolframové elektrody a svarové lázně. Při kontaktním startu, známém jako „škrknutí“, může dojít k přenosu materiálu na elektrodu, což zhoršuje její vlastnosti a zanáší nečistoty do svaru. HF zapalování tak umožňuje čistší a kvalitnější start, který je vyžadován zejména u metody svařování TIG při práci s nerezovou ocelí, hliníkem a dalšími citlivými materiály.

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