Discussion
The selection of nozzle for pipe welding depends upon:
Answer: B
The nozzle is selected according to the pipe wall thickness.
In gas welding the nozzle (tip) size sets how much gas, and so how much heat, the flame delivers. The heat needed depends on how much metal must be melted through, which for a pipe is its wall thickness: a thicker wall needs a larger nozzle.
The groove angle affects the joint preparation and the amount of filler, and the pipe diameter affects how the joint is welded around, but neither sets the flame size the way the wall thickness does. So 'All of the above' is wrong.
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