Explosive welding
It has been observed that the explosion of fluttering pieces of metal hitting the surrounding metal, sometimes permanently welded to them. The research helped to create industrially useful method of explosion welding. Its essence lies in the fact that the welded part or strike with great speed runs to the one struck details. The speed of the striking details of the time of the collision must be several hundred meters per second, approaching the speed of the projectile firearms. In the zone of collision of the metal parts to be joined is flowing like a liquid and merges into one, forming a monolithic connection.
Hit piece throws an explosive charge, which weight is 10-20% by weight of detail.
We strike the fixed part can have any mass, with details of its lack of weight is placed on the massive base - one struck the increase in mass improves the energy part of the explosion. Some of the best known applications of explosive welding - fabrication of bimetallic billets (see Fig.). main one struck a plate to increase the weight placed on a level foundation 3. Striking sheet metal 2 at an angle a = 3 - 10 grams to the surface of a plate. On the upper surface of sheet 2 evenly distribute explosives 4, as is used in different cases ammonal, thick, RDX, etc. At the lower edge of the sheet 2 have a detonator 5. The explosion propagates in the direction of the arrow and is shot as if a sheet of plate 2 in 1. First, strikes, and a plate welded to the bottom edge of the sheet 2, then the collision zone and the weld is moved to the right and the entire surface of the sheet 2 is welded to the plate 1. The boundary between the connected components on microsections has the characteristic form of a wavy line. In this way, can be connected to dissimilar metals, such as carbon steel plate can be attached sheet of stainless steel, nickel, titanium, copper, aluminum, etc. The resulting explosion of the workpiece and then rolled into sheets bimetal. The surface explosion of connected components can be several square meters. A second example of the use of explosive welding joints can be connected by pipes. used telescopic or lap joint (see Fig.), where 1 and 2 - the pipe, 3 - explosives, 4 - detonator. Explosives located at the junction of the annular band. To eliminate pipe collapse in the explosion can be used strong enough core (not shown). The use of explosive welding, of course, requires strict adherence to safety rules and storage of explosives. Explosive welding is convenient for the manufacture of individual products is relatively simple shape, control the welding process can only be approximate, since the result depends on the density of the explosive, the uniformity of its location and other parameters, giving in only about regulation. For serial and mass production of small parts is sometimes more convenient way may be magnetic-pulse welding, in many respects similar explosion welding. For example, a magnetic-pulse welding of pipe joint (see Fig.) On butt instead of a circular band of explosives put on a few turns of the coil and is fed through a powerful impulse to the electric current from the batteries of electric capacitors, the emergence of short-term high-density magnetic flux produces an effect similar explosion - the tube is firmly welded vayutsya, and they can be made of dissimilar metals such as aluminum and copper. Magnetic pulse welding allows for precise control and is suitable for mass production of similar products of small size.
Blacksmith (Forge) Welding
Blacksmith (Forge) Welding Part 2
Induction (high frequency) Welding
Diffusion Welding
Casting or Foundry Welding
Friction Welding
Electrolytic Welding
Welding Under Water
Explosive Welding
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