Heat treating before and after welding
Preheating
- carried out prior to welding to slow down the cooling rate in the weld area and to avoid cracking of the weld metal or heat affected zone
- this procedure reduces the possibility of creating a hard martensite structure in the zone between the weld and the base material
Annealing
- performed to reduce any residual stress in the welded joint
For the implementation of these procedures, the company Kontis d.o.o. owns the appropriate equipment:
- electro-resistant Termoproces 60 KW welding gear
- equipment required for heating and annealing processes: heaters, cables, calibrators
The equipment has the ability to accurately adjust heating and cooling, has constant temperature control and can record and print the heating and cooling flow. All equipment has valid certificates of authenticity and calibration.
Kontis d.o.o. has valid certificates for the area of activity (AD 2000-Merkblatt HP 0 / HP 100 R, TRD 201 and EN ISO 3834-3, as well as AD 2000-Merkblatt HP 7/1), issued by the German TÜV SÜD for all the processes in heat treatment of materials in pipeline construction.
