Welding Inspection & Metallurgy API ICP Self Study Notes

3.26 heat input: the energy supplied by the welding arc to the workpiece.
Heat input is calculated as follows:
Heat Input Joules/inch =
where V = voltage, i = amperage, v =weld travel speed (in./min.)
3.27 hot cracking: Cracking formed at temperatures near the completion
of solidification
3.28 inclusion: Entrapped foreign solid material, such as slag, flux,
tungsten, or oxide.
3.29 incomplete fusion: A weld discontinuity in which complete
coalescence did not occur between weld metal and fusion faces or
adjoining weld beads.
3.30 incomplete joint penetration: A joint root condition in a groove weld
in which weld metal does not extend through the joint thickness.