E류 솔기 비자동 약심 가스 보호 CO2 용접.용접공 시험은 무엇을 보나요?
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압축을 받는 부품과 압축을 받지 않는 부품의 E등급 이음부.비자동 약심 가스 보호 CO2 용접.용접공 시험은 무엇을 보나요?
플레이트 용접 자격증을 따는 게 좋겠어요. 추천하는 것은 FCAW-FeII-2G(K)-12-11/15입니다
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