Explosive press fitting method for surface-roughened pipes

Abstract

The invention discloses an explosive press fitting method for surface-roughened pipes, and relates to a press fitting method for the surface-roughened pipes with explosives as the energy. According to the method, the originally smooth surface of a base pipe is roughened mechanically, uneven patterns are formed on the surface of the base pipe, and then the base pipe and a covering pipe are combined in an explosive press fitting mode through explosives. The method combines the respective advantages of machines and explosives and obtains an explosive composite pipe quite economically. An adopted charging structure is simple, convenient and easy to operate, high in practicability and suitable for industrial production. Water serves as pressure transmission medium, the use rate of the explosives is greatly improved, damage of the explosives to the pipe wall is avoided, the use rate of the explosives is improved, the cost is reduced, and secondary pollution is reduced. The composite pipe produced through the method has good mechanical performance and excellent corrosion resistance, and has wide application prospects in the petrochemical industry, especially in a corrosive environment like an offshore oil and gas field.

Description

technical field [0001] The invention belongs to the field of explosive lamination, and mainly relates to the key technology of explosive lamination of metal pipes. Background technique [0002] With the development of modern industry, the performance of a single component metal material has been difficult to meet the requirements. Compared with a single metal, composite materials have the advantages of multiple metals, and can obtain comprehensive properties that a single metal does not have. [0003] At present, the manufacturing methods of composite pipe mainly include: rolling, extrusion, surfacing welding, explosive welding, electromagnetic forming and centrifugal thermite method. The above methods have their own advantages and disadvantages: the common characteristics of rolling and extrusion are high production efficiency and good quality, which can save the loss of metal materials, but the one-time investment is large, and the combination of composite materials is lim...

AI Technical Summary

Problems solved by technology

The above methods have their own advantages and disadvantages: the common characteristics of rolling and extrusion are high production efficiency and good quality, which can save the loss of metal materials, but the one-time investment is large, and the combination of composite materials is limited. It is used in a normal temperature environment; the surfacing method has the advantage of freedom of choice, but only oxyacetylene flame surfacing and plasma arc surfacing can meet the requirements of low dilution rate and thin surfacing layer, and it is difficult to guarantee automation and high productivity; electromagnetic forming is An advanced technology with great development prospects, high efficiency, safety, and two metals with different properties can be connected, but it is only suitable for metals with low processing strength and good conductivity, and the installed capacity of existing equipment is too small to produce low efficiency; heat Flux welding is an efficient composite method that can prepare a variety of coatings, but it is difficult to make a thin and uniform composite layer; centrifugal castings have fine crystals, good mechanical properties, and tight bonding surfaces, but the inner surface quality is poor, and limitations The melting point of the lining metal must be lower than the melting point of the base material; the explosive welding method can realize the compounding of various metals, with high efficiency, the cladding metal can be thick or thin, and the interface is tightly bonded. It is an ideal method for manufacturing composite pipes

In the published documents, patents and other materials, no reports on explosive lamination technology have been found

Images