Coated welding wire suitable for backing welding of nickel-saving austenitic stainless steel and preparation method of coated welding wire

Abstract

The invention discloses a coated welding wire suitable for backing welding of nickel-saving austenitic stainless steel and a preparation method of the coated welding wire. The invention belongs to the technical field of welding materials. The invention aims to solve the technical problems that the working efficiency is low, the production cost is high and the welding quality is difficult to control due to the fact that the inner side of a pipeline must be filled with argon for protection in the existing method for carrying out backing welding on the nickel-saving austenitic stainless steel by adopting solid welding wire argon arc welding. The deposited metal of the coated welding wire comprises the following chemical components in percentage by mass: less than or equal to 0.05% of C, less than or equal to 0.90% of Si, 3.50%-5.00% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 15.00%-17.00% of Cr, 1.50%-2.50% of Ni, less than or equal to 0.55% of Mo, less than or equal to 1.50% of Cu, 0.10%-0.20% of N and the balance of Fe. The coated welding wire is composed of a coating and a stainless steel core wire, the coating is prepared from coating powder and sodium water glass, the coating powder is formed by mixing an arc stabilizer, a slag former, a lubricant and the balance of alloy powder, and the arc stabilizer is a mixture of potassium titanate and sodium carbonate. The welding wire is high in backing welding efficiency and low in cost.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a coated welding wire suitable for nickel-saving type austenitic stainless steel bottom welding and a preparation method thereof. Background technique [0002] The conventional method of welding stainless steel pipes is to use solid wire argon arc welding for back welding. In order to prevent oxidation of the weld bead surface, the inner side of the pipe must be filled with argon for protection, which leads to problems such as low work efficiency and high production costs, and the welding quality is difficult to control. Therefore, it is of great significance to develop a welding wire suitable for root welding of nickel-saving austenitic stainless steel, which is used to improve the welding quality of stainless steel pipes, reduce production costs, and improve work efficiency. Contents of the invention [0003] The present invention aims to solve the pro...

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the existing method of welding nickel-saving austenitic stainless steel by argon arc welding with solid wire, because the inner side of the pipeline must be filled with argon for protection However, the technical problems of low work efficiency, high production cost and difficult control of welding quality are provided, and a coating welding wire suitable for nickel-saving austenitic stainless steel bottom welding and its preparation method are provided.