Welding Inspection & Metallurgy API ICP Self Study Notes

3.51 root face: The portion of the groove face within the joint root.
3.52 root opening: A separation at the joint root between the workpieces.
3.53 shielding gas: Protective gas used to prevent or reduce atmospheric
contamination.
3.54 slag: A nonmetallic product resulting from the mutual dissolution of flux
and nonmetallic impurities in some welding and brazing processes.
3.55 slag inclusion: A discontinuity consisting of slag entrapped in the weld
metal or at the weld interface.
3.56 spatter: The metal particles expelled during fusion welding that do not
form a part of the weld.
3.57 tack weld: A weld made to hold the parts of a weldment in proper
alignment until the final welds are made.