A small size self-shielding flux-cored wire suitable for flat welding and horizontal welding and its application

Abstract

The invention belongs to the technical field of welding materials, and particularly relates to a small-sized self-shielded flux-cored wire suitable for flat position welding and horizontal position welding. The small-sized self-shielded flux-cored wire comprises a carbon steel skin and a flux core filled in the carbon steel skin, wherein the flux core comprises the following the components according to the total mass percent of the flux core: 40-45% of calcium fluoride, 4-7% of lithium fluoride, 10-13% of marble, 12-14% of aluminum powder, 1-2% of zirconium metal, 5-8% of manganese metal and the balance being iron powder. The small-sized self-shielded flux-cored wire suitable for flat position welding and horizontal position welding is used for the welding of a light steel structure. The small-sized self-shielded flux-cored wire provided by the invention adopts a calcium fluoride-lithium fluoride-marble slag system, and the slag system is mainly composed of high calcium fluoride; a large amount of fluoride improves the anti-porosity ability of the flux-cored wire; meanwhile, the lithium fluoride with the relatively good arc-stabilizing effect is added, so that little welding spatter occurs at the flat position of welding; gas protection is not needed; and the small-sized self-shielded flux-cored wire meets E71T-GS related requirements in American Standard AWS 5.20.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a small-sized self-shielding flux-cored welding wire suitable for flat welding and horizontal welding and its application. Background technique [0002] As a new type of welding material, self-shielded flux-cored wire, compared with traditional gas-shielded flux-cored wire, does not require gas shielding during welding, and only relies on various fluorides in the flux core to eliminate hydrogen pores and use aluminum in the flux core to fix The nitrogen in the air prevents the generation of nitrogen pores. The welding process is a typical excessive jet flow and has strong wind resistance; it is simple and efficient to use. [0003] Small specification (wire diameter 0.8mm ~ 1.0mm) self-shielding flux cored wire is mainly used in the welding of light steel structures such as steel doors, steel windows, and thin plates; when used for flat welding or horizontal...

AI Technical Summary

Problems solved by technology

[0008] Compared with the self-shielded flux-cored wire with a diameter of 2.0mm, the self-shielded flux-cored wire with a small specification (wire diameter 0.8mm to 1.0mm) has a smaller diameter, which is easy to produce pores, resulting in a decrease in the strength of the weld, and also cause cracks

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