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Zavarivanje i zavarene konstrukcije
2010, vol. 55, iss. 3, pp. 91-96
article language: Serbian
document type: Professional Paper

Optimal parameters estimation by the analytical methods for the emergency repair welding of the 13CrMo4-5 steel
aInstitute Goša, Belgrade
bIstitute of Material Testing of Serbia - IMS
cUniversity of Belgrade, Faculty of Mechanical Engineering



Over the years 13CrMo4-5 (~Č 7400) steel is applied for production of the parts as pressure vessels and pipes in the thermo energetic plants. Steel 13CrMo4-5 is conditionally weldable and it could be successfully welded and weld repaired with the special care and if preheating and post weld heat treating (PWHT) procedure are applied. It is usually welded with similar filler material. In consideration to specific application of the 13CrMo4-5 steel, in the case of breakdown and emergency repair welding, special care have to be taken to defining welding process parameters and selection of the filler materials. In this investigation a results of the calculations and estimations for the repair welding parameters is based on the analytical equations. Analysis is performed to obtaining optimal parameters for sound welded joint with optimal quality and mechanical properties without PWHT of the joint. Also, calculations of the weld metal strength are performed on the base of previously defined welding parameters for the filler metal similar to base metal.



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