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Submerged arc automatic welding process for high-strength steel Q460GJD for building structure

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

Active Publication Date: 2019-07-05
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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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

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  • Submerged arc automatic welding process for high-strength steel Q460GJD for building structure
  • Submerged arc automatic welding process for high-strength steel Q460GJD for building structure
  • Submerged arc automatic welding process for high-strength steel Q460GJD for building structure

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] 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.

[0038] 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 submerged arc automatic welding process for high-strength steel Q460GJD for a building structure. The maximum plate thickness of the structure steel Q460GJD is 50 mm, the welding material adopts CHW-SG+CHF102A, the diameter of a welding wire is 4.0 mm, strict roasting is performed before a welding flux is used, an X-shaped groove is selected according to the thickness ofa base material, the pre-welding preheating temperature is 110-140 DEG C, multi-layer multi-pass welding process is adopted, the interlayer temperature is 150-200 DEG C, and is higher than the preheating temperature, in the case of the welding parameters, the welding current is 620 + / - 10 A, the welding voltage is 32 + / - 2 V, the welding speed is 40 + / - 1 cm / min, the linear energy is 27.5-32 KJ / cm. Through verification, a structure steel welded product produced through the submerged arc automatic welding process for the high-strength steel Q460GJD for the building structure can completely obtain the good welding comprehensive performance, moreover, the effect of being equivalent to the performance of the base material is achieved, the GB / T 19879-2015 standard and construction structure engineering steel standard requirement is completely met, the linear 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,...

Claims

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Application Information

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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
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