1. A welding process where the heat produced from an arc forms a weld by fusing a metal electrode and material to be welded together.

2. An arc welding method where fusion is accomplished by using an unshielded arc to produce heat between a bare or lightly coated electrode and the material to be welded. The filler metal comes from the electrode and pressure is not used.

3. A welding method using a filler metal that is liquefied at a temperature above 800 F is distributed within a groove, flange or other type of joint and distributed through the joint via capillary action.

4. Various materials that are used to conduct the welding current between the electrode holder and the welding arc.