RU1365530C - Method of producing articles with inner cavities by explosion welding - Google Patents

Abstract

The invention relates to the technology of manufacturing products with internal cavities by explosion welding. The aim of the invention is to improve the quality of the welded joint, as well as reducing the metal consumption of the products. The welded cavity-forming tubular elements with pre-mounted spacer sleeves are installed with a beam diverging inward, the shells are welded to them, and sleeves made of metal that can be easily removed after welding are taken. During the welding process, optimal impact conditions are realized, especially when using high-speed explosives. 1 s.p. f-ly. 2 ill.

Description

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The invention relates to a technology for producing by explosion welding products with internal cavities and can be used for the manufacture of heat exchangers, condensers, crystallizers, honeycomb structures.

The aim of the invention is to improve the quality of the welded joint, as well as reducing the metal consumption of the products.

Figure 1 shows a bundle of tubular elements assembled for explosion welding; figure 2 is the same, a top view.

Pre-tubular cavity-forming elements 1 are installed at an angle between themselves and to the axis of the shell 2 with a variable gap so that they form a beam diverging inward to the shell. The spacer sleeves 3 are made of a material that is easily removed after explosion welding, for example, smelting, burning or dissolving the latter in chemicals. As materials for the spacer sleeves, low-melting alloys (such as Vudu. Rose, Guthrie alloys), leachable oxides such as CaO, plastics, cardboard, etc. can be used. Buffer interlayers 4 are installed between the elements. Then, charges 5 located inside the elements are initiated (see Fig. 1 and 2). In this case, optimal collision conditions are realized, especially when using explosives such as ten, hexagen, etc. with high detonation velocities. The angle diverging from the point of charge initiation by the outer surfaces of the elements being welded provides a welding speed (speed of the contact point) lower than the speed of detonation of the charges, as well as the speed of sound in the metals being joined, which improves the quality of the welded joint.

Reducing the material consumption of the manufacture of heat exchangers is achieved by using materials that are melted after explosion welding (Wood alloy) and can be reused as distance bushings.

PRI me R. In a closed shell with an inner surface in the form of a truncated

from the base of the cavity of the pyramid to its truncated apex, the ends of the bundle of cavity-forming tubular elements assembled in converging from the previously installed distance bushings are mounted. The distance bushings with which they withstand the necessary structural clearance between the pipes are made of fusible material removed after welding

explosion of an alloy, such as a Wood alloy. The distance bushings are put on the cavity forming elements so that they are outside the closed shell outside the welding zone. As cavity forming elements, aluminum tubes AD1-M with a diameter of 12x1.5 mm are used. Remote bushings are made of Wood's alloy. Put on the tubes

bushings provide a clearance between pipes of 2 mm. As an explosive, a detonating cord in a cotton braid of the DSh-A grade GOST 6196-68 is used. An intermediate buffer layer made of polyvinyl chloride is located between the charge of the small cylinder and the inner surface of the pipes.

After the simultaneous initiation of all charges, the LHs produce a heat exchanger by explosion welding. The distance bushings are smelted by immersing the heat exchanger in boiling water.

Claims (2)

1. The method of obtaining products with internal. by cavities by explosion welding, in which tubular cavity-forming elements with pre-mounted spacer sleeves are placed with a gap in a closed shell, in each of which an explosive charge is installed substances and initiate simultaneously all charges for welding the elements between themselves and with the shell, characterized in that, in order to improve the quality of the welded joint, the elements are installed in a beam; diverging into the shell. 2. The method according to n.i, characterized in that, in order to reduce the metal consumption of the products, take bushings from a material that is easily removed after welding. FIG. 2  f 1 5 2