Manufacturing And Production Technology
What type of fusion welding process is used for welding sheet metals of all engineering metals (except Cu, Ag) in automobile and air craft industries, pipe and tubing production?

Resistance welding
Thermit welding
Submerged arc Welding
Electroslag welding

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Manufacturing And Production Technology
Threading is an operation of

Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface

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