FIELD: welding processes and equipment, namely welding of pipelines. SUBSTANCE: method comprises steps of applying melt metal of fed welding wire to welding bath into open root of seam between two arranged one near another edges of welded parts. Root of seam is extended along welding line and it is formed by coming together lateral walls. Apparatus for performing the method includes contact type holder with opening for feeding welding wire; pulse power source for applying welding electric current to welding wire as the last leaves feed opening for moving towards root of seam. Wire feed value is related with overhang value of electrode between contact type holder and welding bath. Apparatus includes circuit for determining length of electrode overhang and unit for controlling intensity of welding electric current depending upon predetermined length of electrode overhang. Method for applying melt metal of fed welding wire between two arranged one near another welded parts comprises steps of applying welding electric current to welding wire fed to welding bath; determining overhang value of wire and controlling welding electric current depending upon length of said overhang. EFFECT: enhanced quality of welded joints of pipelines. 82 cl, 28 dwg
