Low-dust and low-toxicity flux-cored welding wire and use method thereof

Abstract

The invention provides a low-dust and low-toxicity flux-cored welding wire. The low-dust and low-toxicity flux-cored welding wire comprises a sheet iron and a flux core. The flux core comprises, by mass percentage, 40-48% of rutile, 6-12% of quartz, 6-10% of magnetite, 4-6% of aluminum powder, 10-15% of ferrosilicon, 3-5% of ferrotitanium, 4-5% of nickel powder, 1-3% of marble and balance iron powder and inevitable impurities. The filling rate of the flux core in the flux-cored welding wire ranges from 14 to 16%. According to the low-dust and low-toxicity flux-cored welding wire, due to the fact that the flux core does not contain manganese and fluoride, the amount of dust generated in the flux-cored welding wire welding process is reduced remarkably, and welding fume does not contain harmful fluoride and almost no MnO. Meanwhile, argon-enriched shielding gas welding is adopted for the flux-cored welding wire, and according to the comprehensive performance of deposited metal and welding joints, the yield strength is larger than or equal to 470 MPa, the tensile strength is larger than or equal to 550 MPa, the elongation is larger than or equal to 22%, and Akv is larger than or equalto 47 J under the condition of minus 60 DEG C.

Description

technical field [0001] The invention belongs to the technical field of welding material manufacturing, and in particular relates to a low-dust and low-toxicity flux-cored welding wire. Background technique [0002] Manganese is one of the five common elements in the steel industry and is a commonly used strengthening element; since manganese is an austenite forming element and a commonly used metal toughening element, in order to ensure the strength and low temperature toughness of steel, it is used in various steel materials Manganese content is high, such as commonly used steel 16Mn, its main components are manganese and carbon. Similarly, the metallurgical principle of flux-cored welding wire is similar to that of steelmaking. Manganese is an important alloying element, which plays an important role in improving the strength and low-temperature impact toughness of the flux-cored welding wire deposited metal, and is also contained in the slag formed by flux-cored welding w...

AI Technical Summary

Problems solved by technology

However, a large amount of smoke and dust will be generated during the welding process of flux-cored wire. Due to the large amount of manganese in the powder, the smoke contains high MnO. The long-term inhalation of welding fume by welders will lead to "manganese poisoning", "welder pneumoconiosis", etc. occupational disease

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