| 摘要 |
A method for an explosion welding process to form composite pipes, such as for nuclear power equipment. The explosive welding process includes: (1) An explosives preparation method in which low detonation velocity explosives are produced by using powdery emulsion explosives as a base. The base is mixed completely and evenly with a certain amount of powdered pearl salt, wherein the size of pearl salt particle is 100-200 mesh, and the ratio of emulsion explosives versus pearl salt is between about 3-5:1. (2) An experimental formula for determining the diameter gap between an inner lining tube and its base tube, which is s=&egr;·r or s=k&egr;·r. and (3) A method of inhibiting the negative influence on welding quality caused by the gap between a base tube and a mold, wherein: the roughness of the base tube outer surface is kept less than that of the mold's inner surface, with the difference in surface roughness being maintained within two-grades. In certain cases, a layer of 1.0±0.1 mm copper may be added between the outer wall of a base tube and the inner wall of the mold. By using this explosion welding process on composite pipes, the percentage of successful welding reaches 100%, the bonded interface demonstrates micro-wave shape with high quality, and the plastic deformation of the inner tube is under reasonable control.
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