CO2 gas shielded flux cored wire for supporting welding of low alloy steel with strength of 590 MPa

Abstract

The invention relates to a CO2 gas shielded flux cored wire for supporting welding of low alloy steel with the strength of 590 MPa. The CO2 gas shielded flux cored wire is prepared from a steel belt and flux core powder, wherein the flux core powder comprises the following components in part by weight: 4 to 10 parts of sintering powder, 0.1 to 0.7 part of Fe3O4, 0 to 1.0 part of TiO2, 0.1 to 0.5 part of Al, 0 to 0.4 part of Ti, 0.1 to 0.5 part of Si, 2.0 to 3.5 parts of Mn, 0 to 0.4 part of Mo, 0 to 1.1 parts of Ni and 1.0 to 2.0 parts of Fe. The CO2 gas shielded flux cored wire has the advantages that: the deposited metal mechanical property of the produced flux cored wire can meet the technical index requirements; and the moisture-absorbing resistance of the produced flux cored wire is greatly improved, so that the air hole resistance of the flux cored wire is improved, namely after the flux cored wire is unpacked and put into the environment with the relative humidity of 80 percent for 7 days, air holes are not formed during welding.

Description

technical field [0001] The invention relates to welding materials, in particular to a kind of CO2 used for matching welding of low alloy steel with strength 590MPa 2 Gas shielded flux cored wire Background technique [0002] In recent years, in the field of shipbuilding, CO 2 Gas shielded automatic and semi-automatic welding. The application of flux-cored wire greatly improves production efficiency, greatly reduces welding deformation, shortens construction period and reduces production cost. However, in energy construction, especially power station construction projects, CO 2 The gas-shielded all-position titanium-type flux-cored wire does not meet its technical requirements, mainly in the following aspects: 1) The mechanical properties do not match the technical requirements of low-alloy steel welded joints used in power stations: such as CO 2 The deposited metal strength of the gas-shielded all-position titanium flux-cored wire is generally at the marine 3y level, tha...

AI Technical Summary

Problems solved by technology

However, in energy construction, especially power station construction projects, CO 2 The gas-shielded all-position titanium-type flux-cored wire does not meet its technical requirements, mainly in the following aspects: 1) The mechanical properties do not match the technical requirements of low-alloy steel welded joints used in power stations: such as CO 2 The deposited metal strength of the gas-shielded all-position titanium-type flux-cored wire is generally at the marine 3y level, that is, the tensile strength is ≥490MPa, and the Charpy impact absorption energy at -20°C is ≥47J

The low-alloy steel (such as 16Mn steel) with a tensile strength ≥ 490MPa for power stations requires that the Charpy impact absorption energy of the weld at -30°C ≥ 27J (toughness does not match); the low-alloy steel with a tensile strength ≥ 590MPa for power stations Steel (such as 6062 steel) requires that the Charpy impact absorption energy of the weld at -20 ° C is ≥ 47J (strength does not match); 2) Poor porosity resistance, etc.

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