Development of electrodes for welding transmission pipelines and marine equipment made of high-strength low-alloy cold-resistant steels

Selected from Svarochnoe Proizvodstvo 2017(2) 21–29.

Abstract

The problems of production of welding electrodes with basic coatings in Russia is associated with the changes in the raw materials base used as components for electrode coatings, in particular, the electrodes of the UONII-13 series used extensively in industry in welding important structures made of cold-resistant low-alloy steels of different strength categories are examined. A promising composition of the electrode coating with a new deoxidation alloying system is proposed. The system results in high welding and technological characteristics of the electrodes and stable mechanical properties of the metal of welded joints in low-alloy steels with a strength of up to 560 MPa. The high-quality parameters are achieved as a result of using Minal (mineral alloy) in the electrode coating for adding through this coating the mineral and rare-earth components. The compositions of the coatings of the developed electrodes are calculated using the phase equilibrium diagrams of non-metallic systems.

Keywords:

• Manual arc welding
• covered electrodes
• rare-earth metals
• modification

Notes

Selected from Svarochnoe Proizvodstvo 2017(2) 21–29.