METHOD FOR ELECTRIC ARC WELDING OF NON-ROTARY ANNULAR PIPELINE SEAMS Russian patent published in 2021 - IPC B23K31/02 B23K9/10 G01N27/83 

FIELD: welding.

SUBSTANCE: invention relates to electric arc welding of non-rotary annular pipeline seams. Translational movement and transverse oscillations of the welding torch with an electrode are performed with a delay thereof at the edges and the basic values of the welding voltage and current at the corresponding preparation point are corrected depending on the change in the geometry of the joint. Simultaneously with performing the delay, additional voltage and current pulses are applied to the base welding current and voltage, the value whereof is 10 to 12% higher than the predetermined base values. The data is analysed by means of an intelligent unit and the occurrence of characteristic weld defects is predicted, a control signal is sent to the defect marking apparatus activating a pneumatic marker corresponding to the defect. By means of the pneumatic marker, marking is applied to the corresponding path parallel to the position of the welding torch, using paint. Types of defects are marked with different colored paint along different paths of movement of the corresponding markers. After welding, the areas of the weld seam with probable defects, indicated with markers, are subjected to non-destructive testing in order to determine the actual presence of the indicated defects, or forcibly opened and repaired by welding.

EFFECT: increase in the manufacture speed of pipelines and the quality of weld seams.

2 cl, 3 dwg