Tubular welding wire for austenite stainless steel welding

Abstract

The present invention discloses a flux filled in a sheath consisting of 18-8 stainless steel(C<=0.03 wt %, N<=0.02 wt %) comprises an alkali metal compound in an oxide converted amount of 0.05 to 1.0 wt % by weight of the welding wire, a metal fluoride in a fluorine converted amount below 0.08 wt %, Bi oxide in an amount below 0.1 wt %, Mn in an amount of 0.1 to 1.8 wt %, Cr in an amount of 2.0 to 4.0 wt %, SiO2 in an amount of 0.5 to 3.0 wt %, Al2O3 in an amount of 0.1 to 2.0 wt %, and TiO2 and ZrO2 wherein a ratio of (TiO2+ZrO2) / SiO2 is 0.8 to 1.6. Here, an amount of the flux filled in the sheath ranges from 15 to 35 wt % by weight of the welding wire. Accordingly, the flux cored wire restrains bending and high temperature cracking of the stainless steel weld metal, prevents the bead from being drooped, and reduces an amount of fume generated, thereby improving the vertical-up weldability.

Description

technical field [0001] The present invention relates to a tubular welding wire for welding austenitic stainless steel. More specifically, when welding austenitic stainless steel, since the amount of spatter is reduced, stable welding can be carried out without the weld metal flowing during upward vertical welding, even at high temperatures. A tubular wire for welding austenitic stainless steel that can also form a stable weld. Background technique [0002] Stainless steel is an alloy steel that adds chromium to steel to significantly improve corrosion resistance. It can be roughly divided into chromium series and chromium-nickel series according to its composition, and can be divided into martensite, ferrite, and austenite according to the metal structure. , Austenite-ferrite and precipitation hardening system 5 kinds. [0003] Austenitic stainless steel (hereinafter referred to as "stainless steel") is a chromium-nickel system in terms of composition, and 18-8 stainless st...

AI Technical Summary

Problems solved by technology

Therefore, after welding, when removing the spattered and adhered weld metal, follow-up operations such as grinding and grinding are not required, which deteriorates the workability. In addition, when the necessary welding is performed in the upward vertical welding posture, the weld metal tends to flow and the appearance Poor and difficult to perform continuous welding

[0006] In order to solve the above problems, it is also necessary to add a flux containing bismuth to form the welding wire, but this has the problem of increasing the sensitivity of the welded part to hot cracking

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