Double-sided double-arc back-gouging-free welding method of Q460 corrosion-resistant and fire-resistant steel plates

Abstract

The invention relates to a double-sided double-arc back-gouging-free welding method of Q460 corrosion-resistant and fire-resistant steel plates. SQ460 FRW steel plates are processed into a required to-be-welded vertical plate and a required to-be-welded horizontal plate by using a plasma arc cutting manner, and the connecting end of the to-be-welded vertical plate is made to form double-sided symmetrical small bevels without blunt edges; two gas shielded welding torches are arranged on the two sides of the to-be-welded vertical plate, and first-time backing welding is completed according to the method of simultaneous same-direction symmetrical welding from one end to the other end; according to the same welding method, based on the thickness of the to-be-welded vertical plate, welding of afilling layer and a covering layer are sequentially completed from top to bottom. By means of the method, in the welding process using gas shielded welding and the SQ460 FRW steel plates, the weldingquality can be ensured, meanwhile, the welding time can be shortened as much as possible, the melting amount of weld joints is reduced, and the overall welding efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of building material engineering welding, and in particular relates to a double-sided double-arc unclear-root welding method for Q460 corrosion-resistant and refractory steel plates. Background technique [0002] With the development and construction of high-rise steel structure buildings and key projects in my country, the demand for high strength, long life and safety of steel for building structures is becoming more and more urgent. Developing high-performance construction steel with high-strength grades, as well as earthquake resistance, corrosion resistance and fire resistance, overcoming key technologies to ensure "stable and consistent" steel performance and quality, and solving application matching problems are the key to realizing the development and promotion of a new generation of construction structural steel with focus on the application. [0003] With the continuous deepening of research and d...

AI Technical Summary

Problems solved by technology

In the welding of thick plates, double-sided grooves are often used for root cleaning on the opposite side. When root cleaning is performed on the reverse side, it will not only increase the width of the heat-affected zone, cause pollution such as smoke and dust, but also greatly reduce the welding efficiency.

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