The types VHVT-6 welded joint Heat-Treater simultaneously is suitable for stress-relieving at six, the VHVT-8 at eight and the VHVT-12 at twelve different welded joints. Heating the welded joints and their peripheries until a given degree, during a given lapse of time and then cooling them at a given speed can be carried out with accuracy and precision. 16 staged heat-treating can be carried out with the modern microprocessoral controlling at every channel. The procedure of heat-treating can be registered[...]