FIELD: technological processes.
SUBSTANCE: invention relates to large-diameter pipes welding method. Performing tack weld with welding torch with simultaneous monitoring over edges joint using scanning sensor located before welding torch. Immediately after tack weld welding performing application of notch onto it by laser beam or mechanical tool, which position is adjusted by means of said sensor. Performing root weld hybrid laser-arc welding by welding head, which position is adjusted relative to joint by said sensor guidance onto produced notch.
EFFECT: invention enables to avoid occurrence of inadmissible defects in form of penetrations and edges incomplete fusion in hybrid laser-arc welding welds, which can occur at laser beam deviation from welded joint.
1 cl, 1 dwg
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