Surfacing welding method for inner wall of thin-wall cylinder

Abstract

The invention discloses a surfacing welding method for the inner wall of a thin-wall cylinder. The surfacing welding method comprises the following steps of surfacing a stainless steel surfacing layer on the inner wall of a cylinder base body by using a stainless steel flux-cored wire; and surfacing a tungsten carbide surfacing layer on the inner wall of the stainless steel surfacing layer by using a nickel-based tungsten carbide welding wire, wherein the filling rate of the nickel-based tungsten carbide welding wire is 65%, and a flux core of the nickel-based tungsten carbide welding wire comprises, by weight, 78%-85% of WC, 1%-10% of TiC, 1%-6% of borax, 0-5% of dehydrated potassium feldspar, 0-5% of high-carbon ferrochrome and 0-5% of metal molybdenum. The requirement for wear resistance of the inner wall of the large thin-wall cylinder can be met, welding spatter is small, weld joint forming is attractive, wettability of deposited metal and the cylinder base body is good, shrinkage deformation of the welded cylinder is small, and the requirement for normal production size of workpieces can be met.

Description

technical field [0001] The invention relates to a surfacing welding method for the inner wall of a thin-walled cylinder. Background technique [0002] At present, my country is paying more and more attention to the major equipment manufacturing industry, especially the key core technologies to tackle the "stuck neck" problem. The accompanying solderability issues are also more challenging. For example, in the field of high-end titanium dioxide preparation, the preparation of titanium dioxide by chlorination has become the mainstream preparation method for producing titanium dioxide in foreign developed countries because of its advantages of less "three wastes", less air pollution, high product quality, and easy industrial production. The core technology of production equipment has been highly monopolized, and a technological blockade has been imposed on our country. [0003] In this equipment, the cylinder that conveys the mixture of titanium-rich material and coke in the ...

AI Technical Summary

Problems solved by technology

[0006] Question 1: Selection of welding materials

At present, domestic tungsten carbide surfacing welding wires are available in the market, and the surface hardness of a single layer of surfacing welding cannot reach 58HRC (generally 40-55HRC), while imported tungsten carbide surfacing welding wires are expensive and have a long delivery cycle

[0008] Question 2: Welding process formulation

[0009] Due to the large size and thin wall of the cylinder, problems such as welding spatter, poor weld bead formation, and peeling of the surfacing layer may occur during the automatic welding process of the cylinder.

[0010] Question 3: Changes in cylinder size

[0011] In the continuous automatic welding process, the large shrinkage and deformation of the cylinder may be caused by the large welding heat input

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