The electrical explosion of the aluminum foil will effectively bond the metal. Free Technical Library News

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Electric explosion of aluminum foil will effectively bond the metal

13.01.2016

Metal parts are well connected by welding. However, the weld is usually the very place where the strength of the metal is less. In addition, not all metals can be welded together. For example, it is not easy to weld an aluminum body to a steel frame. And many would like this, because, say, such a car would be both lighter and less susceptible to corrosion.

Usually, spot welding is used to weld the non-weldable, melting the metal at several points: this does not form an extended seam that weakens the entire structure. But materials scientists are looking for new ways.

One of them is explosion welding. Here's what it looks like as interpreted by Glenn Dyen of Ohio University. The parts to be welded are wrapped in aluminum foil and a powerful pulse of electric current generated by a supercapacitor is passed through it. The current instantly heats the foil, and it evaporates, actually explodes. The force of the explosion is such that pieces of metal rush towards each other with great speed and are tightly connected by peculiar whirlwinds of matter.

Such an explosion consumes little energy, since there is no need to melt large amounts of metal; does not deteriorate from heating and the structure of the material in the area of the seam. The seam itself is stronger than the material next door. In this way, steel can be welded not only with steel, but also with titanium or aluminum.

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