Ultralow-hydrogen high-toughness submerged arc welding flux core and submerged arc flux-cored wire

Abstract

The invention relates to an ultralow-hydrogen high-toughness submerged arc welding flux core and a submerged arc flux-cored wire. The welding flux core comprises the following components of: CaF2, Na2SiF6, ReF, BaCO3, CaCO3, MgO, TiO2, SiO2, ZrO2, boride, Na2O, K2O, Mn, Al-Mg, Ni, Ti, Si, Re and the balance of Fe. When the welding flux core is matched with a high-alkalinity sintering welding flux, the weld metal has the impact absorbed power of more than 80J at the temperature of 60 DEG C below zero; when the welding flux core is matched with a low-hygroscopicity smelting welding flux, the weld metal has the impact absorbed power of more than 90J at the temperature of 40 DEG C below zero; and when the welding flux core is matched with any one welding flux, weld diffusion hydrogen content is less than 5ml / 100g. The standard specific ultralow-hydrogen range is achieved; and the submerged arc flux-cored wire is high in cold crack resistance, has high in fracture toughness value, is suitable for low-alloy high-strength steel and can be used for welding important structures.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to an ultra-low hydrogen and high toughness submerged arc welding flux core and a submerged arc flux cored welding wire. Background technique [0002] As an automatic and efficient welding process, submerged arc welding has been widely used. However, due to the large welding line energy, the cooling rate of the welding zone is slow, and the weld metal structure is easy to coarsen, resulting in a decrease in low temperature toughness. Therefore, there is always a contradiction between the high efficiency of the welding process and the high toughness of the joint metal in this process. At the same time, the high-alkalinity sintered flux combined with high-toughness welding wire has the disadvantages of high moisture absorption, high content of diffusible hydrogen in the weld, and easy formation of hydrogen-induced cracks under the condition of large degree of restraint. [0003] At p...

AI Technical Summary

Problems solved by technology

Neither of the above two submerged arc welding flux-cored wires mentions that an appropriate amount of slag agent is added to the wire, which is suitable for high-alkalinity sintered flux and low-moisture-absorbing smelting flux at the same time, so as to reduce the diffusion of hydrogen in the weld and improve low-temperature toughness and resistance. cracking content

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