French to English Tech/Engineering Metallurgy / Casting Sheet metalwork

Table d’assemblage équipée de deux pinces et d’une *carotte* pour utiliser la soudure électrique par point.

This sentence occurs in a description of machinery found in a factory producing furniture made out of sheet metal. I have found 'bore plug' or 'boring core' in Termium/GDT and here in KudoZ, but this seems to apply to cast metal (Bouchon formé dans le trou de coulée par la solidification intempestive de la fonte.)

I have also found 'sprue' but this also applies to pouring metal into a mould.