Steel-stainless steel mining gas drainage pipe exploding welding device and welding method

Abstract

The invention relates to a steel-stainless steel mining gas drainage pipe exploding welding device and welding method. The welding device comprises a stainless steel inner composite pipe, a steel basepipe and a restraining pipe mold which are vertically and coaxially arranged from inside to outside; explosive layers are uniformly arranged on the inner side face of the stainless steel inner composite pipe; an air layer is arranged between the stainless steel inner composite pipe and the steel base pipe; and the position between the steel base pipe and the restraining pipe mold is filled with arestraining layer composed of liquid or solid granular materials. According to the steel-stainless steel mining gas drainage pipe exploding welding device, the position between the steel base pipe and the restraining pipe mold is filled with the dispersible restraining layer, universality of the pipe mold is widened, and one pipe mold is adopted and can be used for preparing steel-stainless steelcomposite pipes in a series of pipe diameters. The steel-stainless steel composite steel pipes prepared through the welding method are free of the surface defects of cracks, scratches, pits and the like according to quality test, the combining rate of the steel base pipe and a stainless steel inner composite pipe combining area is higher than 96%, and requirements are met.

Description

technical field [0001] The invention belongs to the technical field of preparation of mine gas drainage pipes, in particular to a steel-stainless steel mine gas drainage pipe explosive welding device and welding method. Background technique [0002] Mine gas drainage pipe is a special pipeline used to drain gas in coal mines. The performance of mine gas drainage pipe directly affects the safe production of coal mines. The early mining gas drainage pipes were ordinary steel pipes, which have the advantages of high rigidity and simple and mature production process. However, ordinary steel pipes have been eliminated in the field of mine gas drainage pipelines due to their poor corrosion resistance. With its excellent corrosion resistance, durable flame retardant and antistatic properties and good mechanical properties, stainless steel pipes meet various requirements for underground gas drainage in coal mines, but the high cost of stainless steel pipes limits its application i...

AI Technical Summary

Problems solved by technology

However, most of the existing explosive welding preparation methods for steel-stainless steel composite pipes use a constrained pipe mold outside the base pipe to control the radial deformation of the base pipe. Both require matching restraint pipe formwork. The preparation of restraint pipe formwork requires a large amount of engineering, high cost, and requires a large construction site area, which increases safety risks during the construction process.

Moreover, the pipe mold is in direct contact with the base pipe during the explosive welding process, and the pipe mold wears seriously, which greatly shortens the service life of the pipe mold and increases the use cost of the pipe mold

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