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Inert gas:
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'''Inert gases''', also known as noble gases, are gases that will not combine with any known element. At present, six are known: argon, helium, xenon, radon, neon and krypton. Only argon and helium are used as shielding gases for welding. (1) These gases are only used for nonferrous welding due to lack of adequate penetration of the weld when using pure argon and an erratic ... more |
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Back gouging:
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Back gouging is the removal of weld and base metal by arc gouging or grinding from the other side of a partially welded joint to assure complete fusion and penetration upon subsequent welding from that side. ... more |
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