FIELD: process engineering.
SUBSTANCE: invention may be used for welding longitudinal seams of large-diametre tubes from high-strength steels in construction of main pipelines, field and sea pipelines of oil and gas industry. X-grooved outer seam is laser-arc welded by consumable electrode in pulse-intermittent conditions. Arc pulsation frequency coincides with laser pulse frequency and makes 380-420 Hz. Thereafter, inner seam is welded in one pass in atmosphere of protective gas or under flux layer.
EFFECT: possibility to weld thick-wall tubes with high strength and quality properties.
2 dwg, 2 tbl
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