جوشکاری با فرآیند قوس الکتریکی دستی (E8 ) SMAW

جوشکاری با فرآیند قوس الکتریکی دستی (E8 ) SMAW

36 Pages · 2009 · 428 KB · Persian
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“ Be who you needed when you were younger. ” ― Anonymous
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