Manufacturing method of seamless flux-cored wire

Abstract

The invention discloses a manufacturing method of a seamless flux-cored wire. A mild-carbon steel strip is rolled into a U-shaped groove, wherein after medicinal powder is added into the U-shaped groove, the U-shaped groove is rolled into an O shape and is then welded on; after the U-shaped groove is welded, the diameter of a billet pipe is reduced to 6 to 12mm in a cold tandem rolling manner, and the medicinal powder in the pipe is pressed to be compact; the pressed steel pipe is put into an annealing furnace to be entirely annealed and is then taken up and coiled; a welding wire coil is scoured, is coated with lime, and is drawn to be a product which is 1.2 to 1.0mm in length; and after being copperized and wound layer by layer, a welding wire is packaged in a sealed manner on a vacuum packaging machine, and then a finished product is obtained. The method disclosed by the invention can be used to prepare the seamless flux-cored wire with a diameter of 1.0 to 4.0mm, and is used for welding high-strength steel such as 907A steel, 945 steel, 921 A steel, 980 steel and the like; the welding wire can satisfy the welding requirement of the high-strength structure steel with yield strength lager than 785MPa, and the diffusible hydrogen content of deposited metal is smaller than 5ml / 100g deposited metal; and the requirement for manufacturing the seamless flux-cored wire can also be satisfied by utilizing conventional medicinal powder.

Description

technical field [0001] The invention relates to a welding material production technology, in particular to a production method of a seamless flux-cored welding wire. Background technique [0002] At present, the flux-cored welding wire used for high-strength steel welding is seamed flux-cored welding wire. It is difficult to change its own moisture absorption characteristics during shipyard construction. If the moisture-proof measures are not good after use, the welding wire powder is easy to absorb moisture and the surface of the welding wire is easy to rust. Pores or even welding cracks will easily occur in subsequent welding seams, resulting in a decline in welding quality. At the same time, because the surface of this type of welding wire cannot be plated with copper, the conductivity and wire feeding performance of the welding wire are poor, which hinders the use of flux-cored welding wire in the shipbuilding industry. Large-scale promotion and use. The use of seamless...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for manufacturing seamless flux-cored welding wire, which solves the problem that the current production of seamless flux-cored welding wire in the field of alloy steel welding adopts the method of vibrating and adding powder, resulting in uncontinuous production, low efficiency, and welding wire Disadvantages such as powder stratification of internal medicine powder due to vibration

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