You should never look directly at an arc, no matter what the distance. If you need or want to observe, you must have the same eye protection the weldor is using! The problem is eye injury from an arc (this is called 'flashing' your eyes) does not hurt or bother you sometimes until several hours after it has happened. You cannot tell by discomfort or pain if you are too close. By the time the pain sets in, it is too late, and believe me, the pain in your eyes is excruciating. It feels like sand is being ground into your eyeballs. Don't risk it. Use the proper eye protection.
Arc length is the distance from the tip of the electrode to the workpiece.
The 'arc' in arc welding is not an acronym but in turn is a reference to the electric arc that is being generated during the welding process.
If you are asking for the correct nomenclature it is Shielded Metal Arc Welding.
Almost all welding today is done with electricity (Arc Welding) even on cast iron. SMAW, GTAW, GMAW etc. --AW means Arc Welding.
Yes, arc welding does create ozone. It is because the temperatures created during arc welding convert the nearby oxygen to ozone.
Perhaps a simple example is in electric arc welding, where the electric arc is used to transfer the metal from the welding rod onto the workpiece. You may consider the arc (plasma) to be a type of beam, though it only operates over a small distance.
Gas Tungsten Arc Welding Gas Metal Arc Welding Flux Cored Arc Welding
Arc welding uses an electrical current to create enough heat to melt metal. Any type of welding that uses an electric arc is technically arc welding. However, most people use the term 'arc welding' to mean shielded metal arc welding (SMAW), or 'stick welding'. SMAW, MIG, and flux core wire welding use the filler metal as both electrode and filler; TIG welding uses an electric arc to heat the base metal and a separate filler rod to add metal to the weld.
If you are asking for the correct nomenclature it is Shielded Metal Arc Welding.
smaw welding is sheilded metal arc welding
ARC welding uses large amounts of electricity to melt the metal, not a hot flame. So no, LPG cannot be used for ARC welding.
Welding Electrorodes or Welding Rods are used in arc welding. Arc welding is a special type of welding which uses a welding power supply to create an electric arc between the base material (e.g. steel) and the electrode. The Welding Ectrorodes can be used for all weldable aluminum and mild steel.