Workshop Technology
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by

Washing it with water
Rubbing on wood
Using file card
Washing it with dilute acid

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Workshop Technology
Linde welding uses

Oxidizing flame and leftward technique
Carburising flame and rightward technique
Neutral flame and leftward technique
Neutral flame and rightward technique

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