Stainless steel electrode welding core with minimum temperature rise, stainless steel electrode and preparation and application

Abstract

The invention belongs to the technical field of welding materials, and particularly relates to a stainless steel electrode welding core with the minimum temperature rise, a stainless steel electrode and preparation and application. The stainless steel electrode welding core with the minimum temperature rise adopts the seamless flux-cored wire way and includes outer skin and a powder core, and thepowder core comprises the following components by mass percentage: 39-41% of metal nickel, 48-50% of metal chromium, 8-8.5% of molybdenum, 1-2% of graphite and 1-2% of potassium titanate. The invention further provides the stainless steel electrode, the electrode comprises the stainless steel electrode welding core with the minimum temperature rise and skin, the outer diameter of the electrode canbe consistent with a conventional electrode, the welding process performance is excellent, the electrode redness tendency is low, the electrode is suitable for the large standard welding, the gas porosity susceptibility is low, and the excellent mechanical properties and corrosion resistance are achieved.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a stainless steel electrode welding core with extremely small temperature rise, a stainless steel electrode, and its preparation and application. Background technique [0002] E316L stainless steel electrode is widely used in papermaking, petrochemical, coal chemical and marine engineering and other fields due to its good corrosion resistance, weldability and low overall cost. The welding core of this electrode generally adopts ER308L (nominal composition 21Cr-10Ni) or ER316L (nominal composition 19Cr-12.5Ni-2.5Mo) welding wire. 3 times), the resistance heat is large during welding, and the temperature of the welding core in the second half of the electrode rises rapidly during welding (commonly known as redness). The whole piece of drug skin falls off, which seriously affects the welding quality. Usually, 1 / 3 to 1 / 2 of the length of a welding rod calculat...

AI Technical Summary

Problems solved by technology

The nominal composition of the E316L stainless steel electrode coating is 18.5Cr-12.5Ni-2.5Mo. The content of chromium, nickel, and molybdenum is high and the price is expensive. Due to the redness of the electrode, the inability to weld will cause a great waste of the electrode.

In order to reduce the adverse effect of the redness of the welding rod, a small current is generally used for welding in engineering. Taking the Φ4.0mm welding rod as an example, the welding current is usually 140-160A, which will greatly reduce the welding efficiency.

[0003] In order to solve this problem, the patent No. CN104400245B "a carbon steel stainless steel electrode for high-current welding" uses a carbon steel welding core. Although it can solve the problem of redness of the electrode, a large amount of alloying element Cr needs to be added to the coating , Ni, Mo, the addition of a large number of alloying elements in the coating will inevitably lead to an increase in the outer diameter of the electrode

The increase of the outer diameter of the electrode will bring a series of problems. On the one hand, it will cause difficulties in vertical welding and overhead welding; The increase in the amount of construction

The patent number is CN105215580A "An E309L stainless steel electrode that can be used for high-current welding". The patent uses titanic acid slag system, by increasing the content of acidic substances such as quartz, feldspar, and mica in the slag, and refining the molten droplets. To reduce the redness tendency of the welding core, but the addition of a large amount of acidic substances in the coating will reduce the alkalinity of the slag, resulting in the increase of silicon in the electrode, the increase in the sensitivity of the pores and the decline in the comprehensive mechanical properties of the weld metal

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