Ab Volvo

Nitro Nobel Ab

Bengt G Persson

Per I Persson

Reinforcing beam

When joining together pipe-lines, in particular, by means of explosive welding, an outer support tool is generally used, together with an inner peripheral body (3) which is applied by means of explosives (5), to the inner surfaces of the pipes (1 and 2) to be joined. The object of the invention is to replace the support tool by a tube formed from a strip (10), said tube functioning as support during the explosive welding process and which can be removed if desired, by unwinding.

Joint for joining together two pipe ends

Sealing and cracking problems occur when joining coarse-caliber pipes (1 and 2) for oil or gas, for instance, by means of welding. The problem is solved by using an outer peripheral part (3) and an inner peripheral part (4) at the joint, and applying the latter part (4) by means of explosive welding. At the same time, the outer peripheral part (3) forms a firm joint, due to the action of the explosive welding.

Joint between two preferably metallic pipes and method of producing said

A tool for producing bends or steps in curved surfaces has an upper and a lower tool part arranged to work towards one another when in operation. The tool part surfaces conform in shape with the curved surface in which one or more bends are to be formed. The tool part surfaces are made as form tools resiliently mounted and guided in the upper and lower tool parts. The form tools also identify in shape with the original curved surface. The inventive tool is suitably arranged in a press.

Tool for producing bends in curved surfaces

When joining together pipes the pipe ends are usually placed opposite each other and then welded together. This cannot be done with heavy pipes. A gap exists between the ends (3 and 4) to be joined. The invention provides a joint by producing a splicing tube (5) the length of the gap and joining this by means of explosive welding. The invention is also applicable for mending a defect (2) in a pipe (1) by the removal of a sufficiently large section of the pipe (1) to allow the splicing tube (5) to fit into the space obtained, the part removed containing the defect (2).

Method of joining together two pipe ends to form a pipe of metal

A trough-shaped sheet metal component with a deeper and a shallower portion such as an oil pan for combustion engines, and a method of deep-drawing it. In the transition between the deeper and the shallower portion, the edge between the bottom of the shallower portion and its side walls is made with a much shorter radius than the central portion. In deep-drawing the shallower portion and the transitional area, a pressure pad is used in the transitional area, where the material is locked in between die and pressure pad, so that working only takes place by bending in the edge areas.

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Olofstrom, Sweden

Bengt G Persson