Sintered flux for submerged-arc welding of steel structure U-shaped rib plate

Abstract

The invention discloses sintered flux for submerged-arc welding of a steel structure U-shaped rib plate. The sintered flux comprises, by mass percent, 15%-25% of MgO, 3%-8% of CaO, 15%-25% of CaF2, 2%-5% of MnO, 25%-35% of Al2O3, 10%-20% of SiO2, 3%-7% of TiO2 and 1%-3% of SiFe. According to the sintered flux, the welding speed can be increased, the stable fusion depth can be provided in the high-speed welding state, and welding forming is attractive.

Description

technical field [0001] The invention relates to the technical field of bridge welding. More specifically, the present invention relates to a sintered flux for submerged arc welding of U-shaped ribs in steel structures. Background technique [0002] At present, the design requirement of U-shaped rib fillet welds on most steel structures at home and abroad is that the penetration depth is not less than 80% of the plate thickness. However, to meet this requirement, strict requirements must be imposed on the assembly process and welding process in the production process. , the existing welded steel structure U-shaped rib fillet weld full-penetration welding material is very easy to cause the workpiece to weld through or fail to reach the design penetration due to factors such as large assembly gap errors and unstable welding specification fluctuations during the welding process Require. Therefore, it is of great significance to seek a full-penetration welding material for U-sh...

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Problems solved by technology

[0002] At present, the design requirement of U-shaped rib fillet welds on most steel structures at home and abroad is that the penetration depth is not less than 80% of the plate thickness. However, to meet this requirement, strict requirements must be imposed on the assembly process and welding process in the production process. , the existing welded steel structure U-shaped rib fillet weld full-penetration welding material is very easy to cause the workpiece to weld through or fail to reach the design penetration due to factors such as large assembly gap errors and unstable welding specification fluctuations during the welding process Require

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