Technique for manufacturing flux-cored wire from disk round steel wire bar

Abstract

A technique for producing flux-cored wires by using disc round steel wire bars is characterized by comprising following steps: using disc round steel wire bars as raw materials; producing accurate steel bands used for flux-cored wires exclusively; producing semi-finished products which are flux-cored wire blank tubes by using accurate steel bands; producing termination products by drafting to reduce the diameter thereof with a high speed; packaging the termination products by winding with a high speed. The advantages of the invention are: the invented technique uses high-speed hot-rolling disc round steel wire bars to replace broad cold-rolled steel strip, so that the raw material cost is reduced greatly; the continuous overlong endless accurate steel bands are used to save assistant procedure time for welding steel band joints, reduce end breakage rate during rolling and drafting procedures, improve continuous operation rate, and further reduce production cost; the invented techniqueuses high-speed accurate cold tandem rolling machine group to solve the problem that the sheet iron rolling precision is difficult to be controlled when rolling flux-cored wires by using disc round steel wire bars directly, and the filling precision is improved greatly since size accuracy of the flux-cored wire exclusive use accurate steel bands is high.

Description

(1) Technical field: The invention relates to a production method of a flux-cored welding wire, in particular to a process for manufacturing the flux-cored welding wire by using a round steel wire. (two) background technology: At present, the traditional methods of manufacturing flux-cored welding wire almost all use the steel strip method, that is, the wide cold-rolled coil is used as the raw material, and it is first cut into steel strips; The steel strip is then rolled into a U-shaped groove, powdered, closed, and reduced in diameter, and finally made into left and right finished flux cored wires. The outstanding disadvantage of the steel strip method is that the price of the wide cold-rolled coil is relatively high, so the production cost of the flux-cored welding wire remains high. Secondly, the length of a single steel strip cut from cold-rolled steel strip coils is limited, generally no more than 1,000m, so it must be tailored and welded into an ultra-long steel stri...

AI Technical Summary

Problems solved by technology

The outstanding disadvantage of the steel strip method is that the price of wide cold-rolled coils is relatively high, so the production cost of flux-cored welding wire remains high

Simple rolling in the thickness direction can also easily cause cracks on the edge, which will cause abnormal fracture of the welding wire during subsequent drawing and reduction and accelerate the wear of the wire drawing die

In addition, the above-mentioned patent adopts full cold rolling and cold drawing process, and the metal is hardened by excessive cold work

Excessive hardness of the finished flux-cored wire also increases its wear on the nozzle of the welding torch and affects the wire feeding performance of the welding wire

The most important thing is: because the process of rolling the round steel into a U-shaped billet and the subsequent powdering, forming, and reducing processes are completed on a set of continuous equipment, the linear speed of the U-shaped billet at the powdering place It should not be too high (generally ≤ 100m / min), otherwise it is easy to cause the powder to spill out, which limits the increase in the production speed of the entire set of equipment, so the production efficiency of the entire set of production lines is low, and the production cost is also increased, so it is difficult to be used in large-scale scale industrial production

It is for the above reasons that since the first patent proposing to use the coiled steel wire rod as the raw material to manufacture flux-cored wire by the all-cold rolling process, it has not been widely used in industrial production.

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