Stainless steel welding rod capable of resisting redness and cracking of coating

Abstract

The invention belongs to the field of welding materials, and particularly relates to a stainless steel welding rod capable of resisting redness and cracking of coating. The stainless steel welding rodcomprises a stainless steel core wire with a longitudinal V-shaped groove formed in the peripheral surface, a copper-plated layer and the coating, wherein the coating comprises the following dry powder components of 10-12% of rutile, 8%-10% of mica, 8%-10% of calcium carbonate, 8%-10% of magnesium carbonate, 5%-7% of nickel carbonate, 3%-5% of white mud, 2%-4% of zirconium oxide, 8%-10% of fluorite, 1%-3% of spodumene, 4%-6% of ferromanganese, 2%-4% of ferrotitanium, 5%-7% of ferrosilicon, 0.2%-0.3% of sodium alginate, 0.15%-0.25% of carboxymethyl cellulose, 1.5%-2% of nano cerium oxide and / or nano yttrium oxide and / or nano lanthanum oxide, and the balance feldspar. According to the stainless steel welding rod, the core wire is small in volume expansion after being heated, the coating strength is high, the welding arc voltage is high, molten drops are in slag wall and jet combined transition, and reddening resistance and cracking resistance of the coating are high.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a stainless steel welding rod resistant to redness and cracking of the drug skin. Background technique [0002] At present, there are generally disadvantages of poor workmanship in stainless steel electrodes. The key problem is that the coating is prone to redness and cracking when the electrode is welded to the second half. At the same time, the beneficial elements transitioning through the coating will also burn out in advance, which will have an adverse effect on the properties of the weld metal. In more serious cases, the coating will crack or fall off and the welding will have to be terminated, resulting in Huge waste of welding rods; in addition, the melting speed increases, the welding process deteriorates, and the spatter increases, resulting in deterioration of weld formation and difficulty in slag removal. In short, the redness of the coating means that the g...

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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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