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SHIELDING GASES
Shielding gas is directed by the torch to the arc and weld pool to protect the electrode and the molten weld metal from atmospheric contamination.
Argon and helium or mixtures of the two are the most common types of inert gas used for the shielding. Argon hydrogen mixtures are used for special applications.
chemical milling is used in aircraft plant to create pockets in wing sections made of an aluminium alloy. the starting thickness of one work part is 20 mm.a series of rectangular s
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steam coming out of the whistle of a pressure cooker is ?
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