A stainless steel electrode that resists redness and cracking of the drug skin

Abstract

The invention belongs to the field of welding materials, in particular to a stainless steel welding rod resistant to redness and cracking of the drug skin, comprising a stainless steel welding core with a longitudinal V-shaped groove on the outer peripheral surface, a copper plating layer and a drug layer, and the dry powder component in the drug layer For: Rutile 10%‑12%, Mica 8%‑10%, Calcium Carbonate 8%‑10%, Magnesium Carbonate 8%‑10%, Nickel Carbonate 5%‑7%, White Clay 3%‑5%, Zirconia 2%‑4%, 8%‑10% fluorite, 1%‑3% spodumene, 4%‑6% ferromanganese, 2%‑4% ferrotitanium, 5%‑7% ferrosilicon, sodium alginate 0.2%-0.3%, carboxymethyl cellulose 0.15%-0.25%, nano-cerium oxide and / or nano-yttrium oxide and / or nano-lanthanum oxide 1.5%-2%, and the rest is feldspar. The welding core of the invention has small volume expansion after being heated, high strength of the coating, high welding arc voltage, joint transition of molten droplet in the form of slag wall and jet, and strong resistance to redness and cracking of the coating.

Description

Technical field[0001]The present invention belongs to the technical field of soldering materials, and is specifically an anti-drug leather red and cracking stainless steel electrode.Background technique[0002]At present, there is a shortcomimination of artic art in the stainless steel electrode. The key issue is that the electrodes are free to blow to the second half, and the red-red will make the gas in the pharmacodynample early decompose, so that the molten pool is lost Protect the atmosphere, which is easy to generate air pores; at the same time, the beneficial elements of the drug transition will also be burn in advance, and the adverse effects of weld metal performance will cause the pharmaceutical cracking or falling off to terminate the welding. The huge waste of the welding rod; in addition, the melting speed is increased, the welding process is deteriorated, the splash is increased, resulting in deterioration of weld formation, delaid. In short, the pills are red, which mea...

AI Technical Summary

Problems solved by technology

The disadvantages of this technical solution are: 1) a large number of chromium particles and nickel particles exist in the coating, and the arc is moving. In order not to have a melt-through defect, the moving speed of the arc should be moderate and not too slow, which will cause The chromium particles and nickel particles cannot all melt into the weld, but part of them melt into the molten pool, and some exist in the welding slag in the form of particles, and the proportion of particles melted in the molten pool and remaining in the slag cannot be predicted and controlled , so its design and manufacture are extremely difficult. On the other hand, due to the gradual decrease in the temperature of the molten pool, the particles dissolved in the molten pool will not melt, but exist in the deposited metal in the form of solid particles, resulting in a decrease in the mechanical properties of the weld. The desired effect cannot be achieved; 2) a large amount of alloying elements chromium and nickel need to be added in the coating, the addition of a large amount of alloying elements in the coating will inevitably lead to thickening of the electrode coating, and the thickening of the electrode coating will bring some A series of problems: ①The adhesion of the coating is reduced and it is easy to fall off; ②The coating of the electrode coating is not fully melted, because the substance contained in the coating is a mixture of inorganic non-metallic materials and metal materials, and its conductivity is poor, and the coating with a large thickness The conductivity is worse, which seriously affects the stability of arc combustion during welding, and at the same time weakens the effect of gas generation and slagging, and is also prone to defects such as insufficient metallurgical reaction in the molten pool, and the drug skin falls into the molten pool in pieces to form slag inclusions. , the quality of the weld is reduced; ③thick coating will cause the diameter of the electrode to increase, resulting in difficulties in vertical welding and overhead welding, and narrow gap welding cannot be performed. Larger grooves need to be opened during welding, resulting in an increase in the amount of electrodes used and a decrease in the amount of construction Increase; 3) When 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

[0008] The Chinese patent application number 94118437.4 (application date: November 20, 1994) discloses a redness-resistant austenitic stainless steel electrode and its preparation method. Metal materials achieve the purpose of faster heat dissipation, but the effect is not significant, and the effect of improving the crack resistance of the electrode is not obvious, and it cannot prevent the expansion and deformation of the stainless steel core from increasing, resulting in cracking of the coating

[0009] Li Xiaomei's paper "Development of New Anti-Redden Stainless Steel Electrode" (Mechanical Engineer, January 1994) added rare earth oxides to the coating, which solved the problem of redness of the coating, but could not prevent the expansion and deformation of the stainless steel core The increase of the amount will cause the cracking of the drug skin

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