Welding tubes are used in the process of joining wire ends together. The inner diameter of the welding tube makes for a clean and strong joint. The material cordierite offers excellent temperature and thermal shock resistance, while retaining low thermal expansion. High strength while still being brittle enough to break off after the welding is finished. Subec welding tubes are available in standard sizes or custom sizes made to fit specific needs. Welding tubes are used in the process of joining wire ends together. The inner diameter of the welding tube makes for a clean and strong joint. The material cordierite offers excellent temperature and thermal shock resistance, while retaining low thermal expansion. High strength while still being brittle enough to break off after the welding is finished. Subec welding tubes are available in standard sizes or custom sizes made to fit specific needs.