A kind of low hygroscopicity smaw electrode

Abstract

The invention provides a low hygroscopicity SMAW electrode, which includes two parts, a welding core and a coating. The coating includes the following raw materials in parts by mass: 30-40 parts of marble, 10-15 parts of silicate, 10-20 parts of high-carbon ferrochrome, 5-10 parts of titanium dioxide, 5-10 parts of mixed rare earth and binder 10~20 parts, adopt polyvinyl alcohol (PVA) binding agent to replace traditional sodium potassium water glass as binding agent in the process of making binding agent. Compared with the prior art, the invention has stable components, good mechanical properties in welding performance, good weld metal deposition and strong slag-forming ability. Compared with common coated electrodes, the moisture content of the electrode itself and the deposited metal of the welding seam after welding are far lower than those of common coated electrodes. It can be widely used in welding environment with heavy water content. Moreover, the low hygroscopicity welding rod of the present invention can completely reach or even exceed the J50 welding rod in terms of the mechanical properties of the weld.

Description

technical field [0001] The invention belongs to the technical field of welding, and relates to a low-hygroscopic SMAW electrode, which is widely used in welding environments with heavy water content, such as marine environment welding engineering, bridge welding engineering and the like. Background technique [0002] Manual arc welding (SMAW) is a commonly used industrial welding process. This welding method is convenient and fast, and can easily work in different environments, and often work in environments with heavy moisture. In the process of welding metal, because the coating is easy to get wet, the process performance of the electrode after being damp is deteriorated, and the hydrogen in the moisture easily causes pores and cracks in the weld. The molten pool cannot be fully protected; the moisture gasifies at high temperature, and its oxygen has a chemical effect on carbon to reduce the strength of the material; the combination of hydrogen and the material increases t...

AI Technical Summary

Problems solved by technology

A large amount of water glass is added to the traditional electrode coating as a binder for the coating. Although water glass is a substance with better bonding performance, it can prevent the coating from falling off during the welding process, but this material It is a substance with a large water content and is easy to absorb moisture

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