refoulement

OBS: Refouler : augmenter par forgeage l'épaisseur ou la section d'une pièce de métal portée au rouge, en repoussant la matière latéralement, avec le marteau, vers la partie à épaissir.

CONT: Usually upsetting is performed to provide the thickness needed to form threads so that the tubular products can be connected together.
CONT: The cause of ringworm corrosion has been traced to the upsetting process, in which the heat required in upsetting causes the heated end to have a different grain structure from the rest of the pipe.