if you check out the sites in French and English, I think you'll find that this is the corresponding term
After designing a piece, a lampworker must carefully plan how to construct it. Once ready to begin, the lampworker slowly introduces glass rod or tubing into the flame to prevent cracking from thermal shock. The glass is heated until molten, wound around a specially-coated steel mandrel, forming the base bead. It can then be embellished or decorated using a variety of techniques and materials. All parts of the workpiece must be kept at similar temperatures lest they can shatter. Once finished the piece must be annealed in an oven to prevent cracking or shattering.
if you check out the sites in French and English, I think you'll find that this is the corresponding term
http://en.wikipedia.org/wiki/Lampworking
http://www.glass.co.nz/lampwork.html
http://www.bijoux-verre.com/presse.pdf
http://www.journees-metiers-art.com/page.php?page=recherche&...