One kind of fast x90 pipeline steel submerged arc welding method for manufacturing

The present invention discloses a high-strength linepipe X90 flash welding method without preheating, welding according to the characteristics of high strength steels girth weld fabrication, high strength and high toughness 800MPa using a solid wire to weld the pipeline mixed Ar + CO2 gas shielded arc welding using welding wire with high toughness of high strength 800MPa basic agglomerated flux CaO-CaF2-Al2O3-based, double weld of the outer pipeline quickly submerged arc welding wire. In order to achieve a rapid double wire X90 pipeline submerged arc welding using high strength and high toughness, with the basic agglomerated flux. Welding speed, welding current and arc critical range voltage closely matched. The present invention is rapid under conditions of welding without preheating X90 steel, ensure that the entire weld joint having a high plasticity and toughness reserve, to prevent weld cracking, with high welding productivity. This welding process of the invention has a low cost of production, easy operation and applicability characteristics, has good application prospect.