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Welding tip
Mig tip
Arc length is the distance from the tip of the electrode to the workpiece.
Not all thimbles have holes, but holes would allow moisture to escape. If you have ever used a thimble that does not have a hole, after a while the end of your finger tip looks like you have been soaking it in water.
It is just at the end of the blue flame that comes from the tip.
nostrils?
A bottle brush is perfect for cleaning sunroof drain holes on the Ford Escape. The smaller tip on a two-tip bottle brush can be inserted and then pulled out to clean sunroof drain holes.
A welding torch as opposed to a cutting torch is more appropriate . Welding torches accommodate a variety of tip sizes designated by a number and have only one orifice (hole) for the flame. The smaller the number the smaller the tip orifice (hole) and a smaller flame. Larger numbers means larger hole sizes and larger flames. Sizes start at 0 and can be as large as 40 or more. The size of the tip is determined by the thickness of material to be welded/brazed. Thin materials would call for a small tip size, thick materials would need a larger tip size.
Depend upon dia of electrode & Arc length between Electrode tip and job surface.
Go to your local welding supply store. They sell tools called "tip cleaners" that will help you do that. If the tip is too far gone you will have to buy a new one.
Sensitivity.
Arc length is the maximum length between the tip of an electrode and the work, measured along the tangents.