| A | B |
|---|
| Backing | Any material placed at the root of a joint to assist in welding |
| Base metal | The metal to be welded, cut, or brazed. |
| Code | A set of regulations covering permissible procedures in welding and fabrication. |
| Distortion | The expansion and contraction of parts due to welding and cutting. |
| Load | The amount of force applied to a structure. |
| Melt-through | Complete joint penetration. |
| Nonferrous metal | Metal that does not contain iron |
| Oxide | The scale formed on metal when it is exposed to air |
| Peen | The rounded end of a ball peen hammer used for stress relieving welds |
| Piping porosity | an elongated porosity, longer than it is wide. |
| Root Face | A small facing on the end of a chamber |
| Root opening | The space between the base metal pieces at the bottom or root of the joint. |
| Transverse | Placed or running crosswise |
| Weathering steel | A steel alloy that forms a heavy oxide that prevents further corrosion |
| Welding procedure specification | The document containing all of the information to make an approved weld |
| Weldment | An assembly that has been welded together |
