General information

Composite metals

Composite metals are combinations of two or more different metal layers, bonded together to form an uniform structure.

Bonding methodes of metals are for example glueing friction welding and and explosion welding.

Composite metals have been developed for producing properties, which can not be achieved by single metals.

Typical unique properties are for example corrosion resistance, weldeability to two non-weldeable metals, electrical conductivity.

Composite materials give significant saving in many applications, compared to full thickness single metal.

Explosion Welding Technology

Explosion welding is used both as a cladding process as well as a joining process.

Russian Federal Explosion Center and Research-Design Technology Company “Impulse Treatment of Materials” are one of the leading organization in the world mastering, developing and designing methodes, matrials and applications for explosion welded clad metals.

Luputec is cooperating with those organizations in exlosion welding theory and techniques.

These world famous organization produce the explosion welded materials, which are used in our final products.

The explosion welding process uses the impact energy of an explosive material to create a atomic level metallurgical bond between the welded metals. Before welding the cladding and base metal surfaces are ground and then placed parallel, cladding metal on the top and leaving a precise spacing between the surfaces to be joined. A precise layer of a special explosive material is placed on the cladding metal surface. The explosive material is detonated from one end and the detonation front travels uniformly across the surface through the entire area. Due to high impact, caused by explosion, the cladding metal collides with the base metal at a specific velocity and angle creating pressure of millions of Newtons per square cm. Collision movement creates highly energetic “jet” blow, which advances ahead of the detonation front and blows off metal oxides and impurities, which would be harmfull for the welding. The combination of surface cleaning and extremely high pressure produces a continuous atomic level metallurgical weld. Typically the joint layer has undulating shape and thin “micro-fusion” formed layer at the weld line. The explosion welding process creates a high-strength bond with atomic level metallurgical weld completely over the entire surface. The explosion and consequtive collision generates intense heat, but due to time insufficiency for heat conductancy heating effect is negligible. There are no changes in the metallurgical characteristics or properties in the joined metals.