Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive

Abstract

The invention provides a manufacturing process of an explosive composite pipe with a negative pressure cavity based on a liquid explosive. The manufacturing process comprises the following steps thata covering pipe and a base pipe are sequentially and coaxially mounted on a soft base from inside to outside, the explosive amount is calculated according to the specification of a to-be-composited pipe blank, and meanwhile an inner pipe dose adjusting water column is mounted; the upper end of an annular cylindrical gap between the covering pipe and the base pipe is sealed through a sealing ring,and an annular cylindrical cavity is sealed after being pumped into negative pressure through a vacuum pump; and the assembled to-be-composited pipe blank and a container are coaxially arranged, and then liquid explosive is injected, and the explosive is ignited so that a metal composite pipe can be obtained. According to the manufacturing process, the production efficiency can be greatly improved, explosive charging is uniform, the bonding rate of the composite pipe is high, the welding quality is good, and a constraint mold does not need to be applied in the welding process, so that the production cost can be greatly reduced; and meanwhile, the vacuum pump is adopted for pumping the cylindrical cavity into negative pressure, the influence of air on explosive welding is greatly reduced, the bonding quality of the composite pipe is improved, and the use amount of explosives can be reduced.

Description

technical field [0001] The invention belongs to the field of explosive welding, and is a manufacturing process of an explosive composite pipe with a negative pressure cavity based on liquid explosives. Background technique [0002] Explosive welding technology is a welding method that uses the energy generated by the instantaneous explosion of explosives to make the cladding material hit the base material at high speed, and then realize the metallurgical bonding of the surfaces to be welded between the metals. It is usually used for welding between metal materials with large differences in physical and chemical properties. Metal explosive composite pipes are widely used in the fields of petroleum, chemical industry and aerospace. Existing explosive clad pipes are mainly formed by coiling and welding explosive clad plates. But for some small-diameter composite pipes, welding equipment is difficult to realize internal and external layered welding, and the composite pipes for...

AI Technical Summary

Problems solved by technology

Small-diameter composite pipes need to be obtained through continuous drawing of medium and large-diameter composite pipes, and the drawing process often causes metal peeling and delamination

Explosive welding directly using small-diameter metal round pipes has problems such as difficulty in charging and uneven charging.

In addition, in order to obtain a composite pipe with higher bonding strength, it is usually necessary to impose strong constraints on the outside of the base pipe, usually a steel mold with serious wear and tear, which greatly increases the cost of explosive welding

The traditional explosive welding process of metal circular tubes cannot completely remove the air between the base and the cladding tube, which makes the composite tube bulge, resulting in problems such as low bonding rate and low bonding strength.

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