A heat sink welding and purging apparatus for use in the welding of pipe joints for piping to be used with nuclear power systems and the like wherein the weld area must be kept below a temperature at which the dangers of carbide precipitation occur. The various embodiments include expandable heat sink...http://www.google.es/patents/US4101067?utm_source=gb-gplus-sharePatente US4101067 - Heat sink welding and purging apparatus
