Method of submerged-arc welding of thick sheet S355NL for low-temperature wind tower

A welding method, submerged arc welding technology, applied in welding medium, welding equipment, welding equipment, etc., can solve the problems of no preheating, no heat treatment, etc., to achieve simple welding operation, excellent mechanical properties, excellent low temperature impact toughness and The effect of safety reserves

Inactive Publication Date: 2010-10-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of steel plate S355NL submerged arc welding method for low temperature wind tower, this method can solve the problem of submerged arc welding welding process and matching materials, welding Without preheating before welding and without heat treatment after welding, the welding joint of S355NL steel plate welded by the method has excellent joint comprehensive performance, and each area of ​​the welded joint has a high impact toughness reserve and safety margin

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  • Method of submerged-arc welding of thick sheet S355NL for low-temperature wind tower
  • Method of submerged-arc welding of thick sheet S355NL for low-temperature wind tower
  • Method of submerged-arc welding of thick sheet S355NL for low-temperature wind tower

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Embodiment 1

[0030] A kind of low-temperature wind tower of the present invention uses thick plate S355NL submerged arc welding method, comprises the following steps:

[0031] The steel plate S355NL for low-temperature wind tower with a strength of ≥490MPa produced by thermomechanical controlled rolling and controlled cooling process (TMCP) + normalizing, and the combination of plate thickness is 50mm+50mm. The size of the test plate is 600mm×400mm×32mm; the chemical composition and weight percentage of the selected S355NL low temperature wind tower steel meet: C: 0.10~0.14%, Mn: 1.30~1.45%, Si: 0.20~0.30%, P: ≤0.013%, S: ≤0.005%, Nb: 0.020~0.030%, V: 0.04~0.05%, Ti: ≤0.03%, Ni: 0.20~0.30%, Cr: ≤0.08%, Mo: ≤0.08%, remainder The amount is Fe and unavoidable impurities; the carbon equivalent of steel Ceq≤0.42%.

[0032] Select matching welding materials:

[0033] Welding wire BHM-6, the wire diameter is Φ4mm, its chemical composition and weight percentage are: C: 0.12%, Mn: 1.87%, Si: 0.01%,...

Embodiment 2

[0039] Another kind of low-temperature wind tower of the present invention uses thick plate S355NL submerged arc welding method, comprising the following steps:

[0040] The low-temperature wind tower steel plate S355NL with a strength of ≥490MPa is produced by thermomechanical controlled rolling and controlled cold rolling process (TMCP) + normalizing, and the combination of thick plates is 50mm+50mm. The size of the test plate is 600mm×400mm×50mm; the chemical composition and weight percentage of the selected S355NL low temperature wind tower steel meet: C: 0.10~0.14%, Mn: 1.30~1.45%, Si: 0.20~0.30%, P: ≤0.013%, S: ≤0.005%, Nb: 0.020~0.030%, V: 0.04~0.05%, Ti: ≤0.03%, Ni: 0.20~0.30%, Cr: ≤0.08%, Mo: ≤0.08%, remainder The amount is Fe and unavoidable impurities; the carbon equivalent of steel Ceq≤0.42%.

[0041] Select matching welding materials:

[0042] Welding wire BHM-6, the wire diameter is Φ4mm, its chemical composition and weight percentage are: C: 0.12%, Mn: 1.87%, ...

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Abstract

The invention discloses a method of submerged-arc welding of a thick sheet S355NL for a low-temperature wind tower, which comprises the following steps: adopting an S355NL thick sheet satisfying requirements for chemical composition, weight percentage and technical conditions, wherein the carbon equivalent Ceq of steel is less than or equal to 0.42 percent; using welding wires satisfying requirements for chemical composition and weight percentage; adopting symmetric double-sided X type grooves as submerged-arc welding groove, wherein the groove angle is 60 degrees, the groove gap is 0.5mm, and when the thickness of the sheet is less than or equal to 50mm and the ambient temperature is no lower than 10 DEG C, no preheating is needed for welding; and selecting welding parameters, wherein the welding heat input is less than or equal to 50kJ / cm. The invention realizes the welding process that no preheating is needed prior to welding and no heat treatment is needed after welding during manufacture of the thick sheet structure of the butt joint of the steel plate S355NL for the low-temperature wind tower in marine and cold regions. Due to the multi-layer multi-channel continuous welding, the welded joint has excellent comprehensive mechanical properties, and weld joints and weld heat-affected zones has large impact toughness reserves and safety margins. Therefore, the invention is suitable for promotion and application in the manufacture of the low-temperature wind tower in the factory.

Description

technical field [0001] The invention belongs to the field of iron and steel material welding, and in particular relates to a S355NL submerged arc welding method for thick plates used in low-temperature wind towers. Background technique [0002] Since the energy crisis, people's awareness of green environmental protection has been strengthened. As a clean renewable energy, wind energy is one of the important energy sources in the 21st century. In the development of renewable energy in the world today, wind power is an important , the most mature and large-scale power generation method. In the past 8 years, the world's wind power generation capacity has increased by an average of 15.8% per year. With the rapid growth of wind power generation, the requirements for steel plates for wind towers are also increasing. In the past, the steel used for wind towers mainly used the grades in the EN10025 standard, and the main steel types were S235JR, S355JR, S355J0, S355J2G3, S355J2, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/23B23K9/095B23K35/02B23K35/30B23K33/00
Inventor 邱红雷李丽楚觉非王端军王徐李定金
Owner NANJING IRON & STEEL CO LTD
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