| A | B |
|---|
| Base Metal | Metal to be welded, cut, brazed, or soldered |
| Bevel Angle | The angle formed between the prepared edge of one piece and a plane perpendicular to the surface of that piece |
| Cover Beads | Multiple cover passes in a multiple-pass weld |
| Cover Pass | The final weld pass that forms the weld face |
| Edge Preparation | Shaping of the edges of the joint prior to welding |
| Face Reinforcement | the distance from the top of the weld face to the surface of the base metal |
| Filler Pass | An intermediate pass used to fill the joint in a multiple-pass weld |
| Fillet Weld | an inside corner weld made at the intersection of two surfaces that form approximately a right (90°) angle |
| Fillet Weld Size | The length of the legs of the triangle inscribed into the cross section of a completed fillet weld |
| Flat (1G) Welding Position | Welding done with the weld axis and base metal surface nearly horizontal. The nonstandard term downhand welding also refers to the flat welding position. The designation (1G) indicates a groove weld made in the flat position. The designation (1F) indicates a fillet weld made in the flat position |
| Groove Weld | The total angle formed between the groove face on one piece and the groove face on the other piece |
| Horizontal (2G) Welding Position | A welding position in which the weld axis is nearly horizontal and the surface is nearly vertical. The designation (2G) indicates a groove weld made in the horizontal position. The designation (2F) indicates a fillet weld made in the horizontal position. |
| Joint Geometry | The shape and dimensions of a weld joint, in cross section, prior to welding |
| Joint Penetration/Weld Size | The depth that a weld extends into the joint from the surface |
| Multiple-Pass Weld | A welding joint requiring more than one weld pass |
| Overhead (4G) Welding Position | a weld made on the underside of a joint, with the face of the weld in an approximately horizontal welding position. The designation (4G) indicates a groove weld made in the overhead position. The designation (4F) indicates a fillet weld made in the overhead position |
| Penetration | The depth of fusion of the weld below the surface |
| Root Face | The distance from the root of the joint to the point where the bevel angle begins |
| Root Pass | The first weld pass made into the root of the joint |
| Tack Weld | A small weld used to temporarily hold pieces in alignment |
| Vertical (3G) Welding Position | A weld performed with the weld axis and base metal surfaces nearly vertical. The designation (3G) indicates a groove weld made in the vertical position. The designation (3F) indicates a fillet weld made in the vertical position |
| Welding Position | The orientation of the weld as defined by the weld axis and weld face. The four welding positions are flat, horizontal, vertical, and overhead positions. |
