METHOD OF ELECTRIC ARC WELDING OF FIXED GIRTH SEAMS AT PIPELINES

摘要

FIELD: metallurgy.SUBSTANCE: electric arc welding method for fixed girth seams at pipelines involves translational movement and transverse vibrations of a welding torch with an electrode with longer treatment of the edges and correction of basic welding modes in the respective bevelling point depending of the change of the joint's geometry. Longer treatment of the edges being welded by the welding torch with the electrode is performed simultaneously with the application of additional pulses of voltage and current to the basic welding current and voltage. The value of the voltage and current pulses is by 10-12% greater than the specified basic values of voltage and current and the pulses' duration is equal to the time of the electrode staying at the edge in the position 0-5 hours during 0.1-0.15 s in the position 5-6 hours during 0.4-0.5 s.EFFECT: improved quality of welded joints at welding of fixed girth seams at pipelines.