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A kind of steel q460gjd submerged arc automatic welding process for building structure

An automatic submerged arc welding technology for steel used in building structures, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of unstable quality, low quality level, easy cracks, etc., achieve high quality level and increase productivity , the effect of stable quality

Active Publication Date: 2021-04-09
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The existing base material for welding high-strength building structure steel has a quality grade as low as C grade; the input energy is small and the productivity is low; welding is prone to cracks and the quality is unstable

Method used

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  • A kind of steel q460gjd submerged arc automatic welding process for building structure
  • A kind of steel q460gjd submerged arc automatic welding process for building structure
  • A kind of steel q460gjd submerged arc automatic welding process for building structure

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] The chemical composition of Q460GJD steel plate (base material) with a thickness of 50mm meets the range C: 0.10~0.17%, Si: 0.20~0.50%, Mn: 1.2~1.60%, P: ≤0.012%, S: ≤0.007%, Cr: 0.01 ~0.50%, Mo: ≤0.30%, Ni: 0.10~0.30%, Cu: ≤0.30%, Al: 0.02~0.04%, V+Nb+Ti: 0.07~0.15%, N: ≤0.004%, the balance is Fe and unavoidable impurity elements; wherein, carbon equivalent%=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15), carbon equivalent≤0.50%, the mother of this embodiment See Table 1 for material composition. See Table 2 for mechanical properties.

[0039] Welding process: The preheating temperature of the motherboard before welding is 120°C, and the multi-layer and multi-pass welding process is adopted, and the interlayer temperature is 160°C. Other welding parameters are shown in Table 3. Strictly bake the flux before use, the baking temperature is 350°C, and...

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Abstract

The invention relates to a steel Q460GJD submerged arc automatic welding process for building structures. The maximum plate thickness of the structural steel Q460GJD is 50mm, and the welding material is CHW‑SG+CHF102A; the diameter of the welding wire is 4.0mm; the flux is strictly baked before use; it is selected according to the thickness of the base metal. X-shaped groove; pre-welding preheating temperature 110‑140 °C; multi-layer multi-pass welding process, interlayer temperature 150‑200 °C, higher than preheating temperature; welding parameters: welding current 620±10A, welding voltage 32± 2V, welding speed 40±1cm / min, line energy 27.5‑32KJ / cm. It has been verified that the structural steel welding products produced by its submerged arc automatic welding process can completely obtain good welding comprehensive performance, and the effect is equivalent to that of the base metal; it fully complies with the GB / T 19879-2015 standard and the steel specification for building structure engineering Require. The line energy is increased, the productivity is improved, and the welding quality is stable and reliable.

Description

technical field [0001] The invention relates to a welding process for steel used in building structures, in particular to a Q460GJD welding process. Background technique [0002] In recent years, more and more high-strength steels such as Q420GJ and Q460GJ have been used in high-rise and long-span high-rise buildings. The special advantages in many aspects such as high space utilization rate have become the development direction of international architectural structures. In steel structure engineering, high-performance structural steel is used, which can greatly reduce the amount of steel; correspondingly, greatly reduce the energy consumption of steel; and finally reduce the energy consumed per unit building area. [0003] However, the steel Q460GJD used for building structures has high strength, and it is prone to cracks in welding, which increases the difficulty of welding; so far, there is no reliable welding process, and the welding quality is determined by the groove,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/235B23K9/32B23K35/30
CPCB23K9/18B23K9/235B23K9/32B23K35/3073
Inventor 周福功许晓红白云李经涛王新刚马菁
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD