Fast submerged-arc welding method for X90 pipeline steel manufacturing
A pipeline steel, rapid welding technology, applied in the direction of manufacturing tools, arc welding equipment, welding equipment, etc., can solve the problems of weld strength and toughness matching, cold cracks, hardenability, etc., to achieve high plasticity reserve and prevent welding cracks The production, the effect of low production cost
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Embodiment 1
[0028] The rapid welding of X90 high-strength pipeline steel with a thickness of 16mm, the size of the two test plates is 500mm×1200mm×16mm. Using Ar+CO 2 Inner seam welding with mixed gas shielded welding, Ar and CO 2 The volume ratio of gas is 85%:15%. Fast submerged arc welding is used to weld the outer seam.
[0029] (1) Welding equipment and welding materials
[0030] Welding equipment adopts inverter welding machine and DC submerged arc welding machine with good dynamic characteristics. Mixed gas shielded welding uses 800MPa high-strength and high-toughness solid wire with a diameter of 1.2mm, and submerged arc welding uses a 800MPa wire with a diameter of 4.0mm with high-alkalinity sintered flux to remove oil, rust and other dirt on the surface of the wire before welding.
[0031] (2) Preparation before welding
[0032] The butt joints of two X90 pipeline steel plates with a thickness of 16mm are respectively made V-shaped grooves by grinding with a grinding wheel....
Embodiment 2
[0039] High-speed welding of X90 high-strength pipeline steel with a thickness of 20mm. The dimensions of the two test plates are both 800mm×1600mm×20mm, and they are flat butt welded. Using 85%Ar+15%CO 2 The inner weld is welded by the mixed gas shielded welding method, and the outer weld is welded by high-speed submerged arc automatic welding.
[0040] (1) Welding equipment and welding materials
[0041] Welding equipment adopts inverter welding machine and DC submerged arc welding machine with good dynamic characteristics. Mixed gas shielded welding uses 800MPa high-strength and high-toughness solid wire with a diameter of 1.2mm, and submerged arc welding uses a 800MPa wire with a diameter of 4.0mm with high-alkalinity sintered flux to remove oil, rust and other dirt on the surface of the wire before welding.
[0042] (2) Preparation before welding
[0043] The butt joints of two X90 pipeline steel plates with a thickness of 20mm are respectively made with a V-shaped gr...
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