Alloy powder block used for built-up welding

Abstract

The present invention discloses the alloy pulverescent used for builtup weld. The present invention is characterized in that the alloy pulverescent is produced by metal, iron alloy powder, adhesive and plasticizer, wherein the weight ratio of component is that metal and iron alloy powder : adhesive : plasticizer = 100 : 5~15 : 0~8; the alloy pulverescent is discretionary geometrical body, wherein the size, length and surface shape of the alloy pulverescent can be discretionarily determined according to the requirement of the surface which is to be builtup welded, and the splicing margina thickness of the alloy pulverescent is 0~0.1mm when the alloy pulverescent is arranged on the surface which is to be builtup welded. In the present invention, by designing the cross section geometry of the alloy pulverescent, the electric arc can more easily pass through the alloy pulverescent which is difficult to be melted so as to melt the base metal, and the melting of the base metal accelerates the melting of the alloy pulverescent, thereby the problem of that the alloy pulverescent is difficult to be melted and is easy to be blown about by the plasma jet of the electric arc can be solved, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to a welding material for surfacing welding and its preparation method and application, in particular to a novel alloy powder block for surfacing welding and its preparation method and application. Background technique [0002] In industrial production and processing, mechanical parts often work under extremely complex and harsh conditions, and a large number of mechanical equipment are often scrapped due to wear, corrosion or abrasion. This requires that the surface of mechanical equipment under the working conditions of high temperature and high pressure, high load, oxidation, and corrosion has good properties such as wear resistance, corrosion resistance, high temperature resistance, and oxidation resistance. Surfacing welding is widely used to prepare metal layers with special properties on the surface of parts because of its simple process, low equipment investment, flexible operation and wide adaptability. [0003] Surfacin...

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Problems solved by technology

[0005] Chinese patent CN86106019B "heat-resistant and wear-resistant surfacing electrode", CN1116574A "a kind of high-chromium cast iron surfacing material and technology", CN1003430B "high hardness and wear-resistant no preheating surfacing electrode" and other surfacing electrodes; and CN1238154C "a A kind of flux such as sintered flux for surfacing welding of continuous casting rollers and its production method”; welding rod and flux have the advantages of flexible use and convenient manufacture, but the transition coefficient of alloying elements is low, the composition of surfacing metal is not stable and uniform enough, and surfacing welding The number of layer alloys is limited by the process method, and it is only suitable for low and medium alloy surfacing metals

[0006] Chinese patent CN1415453A "a cored wire for surfacing", CN1775454A "high crack resistance and wear-resistant high chromium cast iron type surfacing flux-cored wire" and other surfacing flux-cored wires have the disadvantages of complex manufacturing process, high cost, It affects its large-scale promotion, and due to the limitation of the filling factor of the welding wire itself (generally less than 35%), the alloy content of the surfacing layer is also limited and will not be too high

[0007] Chinese patent CN1015523B "alloy for surfacing welding" proposes a welding piece for surfacing welding. The welding piece is smelted in a vacuum induction furnace and made by precision casting. The shape of the welding piece can be determined according to the shape of the surface to be surfacing. Using TIG arc cladding to the surface of the workpiece, the manufacturing process of the welding sheet is relatively complicated

The premise of welding alloy powder on the workpiece is that the base metal covered by the alloy powder must be melted. In fact, when arc welding is used, the heat energy of the arc must pass through the alloy powder to reach the base material. A mixture of alloy powders (not alloys), and each alloy powder often has a higher melting point and is difficult to melt, which makes it difficult to melt both the base material and the powder block, and sometimes the alloy powder block is not melted. The flow force is blown away, making the surfacing metal forming extremely poor, and the construction process performance is not good

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