$1$

Use a tip that is one to two sizes larger than that used when welding with the same diameter rod.

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Question $17$

$2$

The hollow electrode wire contains powders to add the required characteristics to the metal's surface.

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Question $17$

$3$

An arc between two current$-$carrying wires must be maintained.

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Question $17$

$4$

The high velocity at which surfacing material leaves the gun and hits the base metal creates a very high bond strength.

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Flux cored arc welding surfacing

Electric arc spray surfacing

Oxyfuel gas surfacing

Gas tungsten arc surfacingmatch

Detonation flame spray surfacing