A combined stainless steel welding core coated electrode

Abstract

The invention belongs to the field of welding materials, in particular to a combined stainless steel welding core coated electrode, including a cylindrical welding core formed from the inside to the outside by using dovetail grooves and dovetail ribs to cooperate and connect, nano graphene coating and coating , arc-shaped grooves are set on the welding core, which can reduce the radial volume expansion of the welding core after being heated and effectively dissipate the resistance heat generated during welding; the copper plating is increased by plating copper on the surface of the two semicircular welding cores. The area of ​​the layer effectively increases the rapid heat dissipation area; the outer surface of the welding core is coated with nano-graphene, which greatly enhances the heat dissipation speed, reduces the heat conduction to the coating, and greatly reduces the redness of the coating And cracking tendency, improve the utilization rate of the electrode, the use length of the electrode reaches more than 90% of the length of the coating, which is far greater than the utilization rate of about 65% of the ordinary stainless steel electrode, and the economic benefit is remarkable. The invention is an innovation in the aspect of stainless steel welding core coated electrode.

Description

Technical field[0001]The present invention belongs to the technical field of welding material, and is specifically a combined stainless steel welding core.Background technique[0002]When the stainless steel material is welded, the traditional stainless steel welding rod is generally used. The welding core of this electrode is used as a solder core, which is coated with a drug skin outside. It is generally a shortcoming of processability. It is mainly the electrode welding to the second half of the medicine. Red cracking, red red will decompose the gas in the pharmacotene, and lose the molten pool to protect the atmosphere, increase the tendency of the welded joint to generate the pores; at the same time, the beneficial elements of the drug transition will also be burned in advance, and weld welding The seam metal performance has adverse effects. When it is more severe, it will cause the pharmacodynamic cracking or falling off to terminate the welding, causing huge waste of the electr...

AI Technical Summary

Problems solved by technology

The disadvantages of this technical solution are: ①The conductivity of the welding core is poor, the arc is easy to rotate along the surrounding tube wall during welding, and the arc is unstable; ②Because the arc is constantly moving during welding, the cooling rate of the molten pool is faster, After the welding core is melted, the composition of the skin on the circumference and the core composition in the middle are difficult to mix evenly due to the positional relationship, resulting in uneven chemical composition of the weld deposited metal, which affects the mechanical properties of the welded joint

The disadvantages of this technical solution are: ① A large number of chromium particles and nickel particles exist in the coating, which will cause the chromium particles and nickel particles to not all melt into the weld, but part of them melt into the molten pool, and part of them exist in the form of particles In the welding slag, the desired effect cannot be achieved; ② a large amount of alloying elements chromium and nickel need to be added to the coating, which will inevitably lead to thickening of the coating of the electrode, which will bring a series of problems: such as decreased coating adhesion, Insufficient melting of the coating of the electrode, etc.; ③When welding, the welding core melts first, and the coating melts later. Elements such as chromium and nickel in the coating are easily distributed unevenly after entering the molten pool, resulting in a decrease in the mechanical properties of the welded joint

[0007] The Chinese patent application number 94118437.4 (application date November 20, 1994) discloses an anti-redness austenitic stainless steel electrode and its preparation method. Metal material, to achieve the purpose of faster heat dissipation, but it can only be coated on the outer surface of the welding core, the area is small, the effect is very insignificant, it has little effect on improving the crack resistance of the electrode, and cannot effectively prevent the redness of the coating on the stainless steel welding to crack

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