Nowadays, due to mechanical, physical, thermal, electrical, and vibration properties, metallic multilayer rods have specific applications in industry. Bimetallic rods made from layers with two different materials have been considered by manufacturers in recent years for simultaneous use of the properties of several materials in a single work piece, such as high strength, corrosion resistance, wear resistance, and improved stress distribution. In this research, the tensile test was performed on steel wire and stainless steel pipes to obtain the stress-strain curve of each sample. Wire drawing dies have been used to make bimetallic rods. Then, two samples of the bimetallic rod were made by swaging with the reduction ratio of 9.75% and 21%. Samples were cut by wire cut machine after production. For interlayer strength testing, dies were designed based on the punch method. The test results were used to calibrate the parameters of the adhesive element in the software. The simulation was performed, using Ansys 17.0 software. Then the results were compared with experimental results. The effects of reduction ratio, internal diameter, sample length, and clad thickness were investigated. The experimental results were in good agreement with the simulation results. By increasing the reduction ratio, the force required for the separation of the two layers has increased, resulting in increased bonding strength between layers.

In recent years, industrial applications of composite sheets have been increasingly expanded due to their extremely different properties such as high strength, low density, and good corrosion resistance compared to single layer sheets. For this reason, in the current study, it is investigated the flanging of composite metal sheets. Also, the behavior of an aluminum-copper sheet, cladded using explosive welding, during incremental forming of a circular collar have been experimentally and numerically studied. In addition, the experimental results are used to validate the numerical simulation of the forming process. At first, in order to understand collar forming of the perforated sheet, the effect of hole diameter, forming direction or layer arrangement on dimensional accuracy, thickness distribution and forming force were investigated and then, the effect of hole flanging and collar forming were compared using two strategies. The results show that by decreasing the initial hole diameter of sheet, the average vertical maximum force increases by 9%, the minimum thickness decreases and its location shifts toward the center of sheet. Aluminum-copper arrangement also experiences a 7% reduction in average force and a 4% increase in minimum thickness due to the protective property of copper layer in tensile state compares to copper-aluminum. Besides, the multi-step method leads to a 6% minimum thickness increase due to better material flow compared to single-step method.

Bimetallic parts are widely used in chemical industry, petroleum, heat exchangers, and pressure vessels due to their properties of bimetallic workpieces, especially high weight strength, better mechanical properties, and at the same time reducing cost and weight loss compared to single-layer parts. Among the various processes used to produce these components, extrusion is a good choice for the formation of bimetallic parts due to the compressive stress and the possibility of metallurgical bonding. In the current study, the effect of temperature on the production of bimetallic parts in the case of shell copper and core aluminum alloy by extrusion method has been investigated. In this study, the two-layer connection of metal for a 45% thickness reduction the ratio was performed for three temperatures of 200, 300, and 400°C. Mechanical properties were also examined using a uniaxial tension test and a microstructure by using optical microscopy and scanning electron microscopy. The results showed that at the ratio of 45% thickness reduction at 200°C, there was no acceptable connection between the two layers, and after the process and cutting off the workpiece, the two layers did not separate, but a weak connection was established The microscopy images at the temperature of 300°C showed that this temperature was the threshold for the two-layer connection, and finally, at the 400°C, a more suitable connection was obtained in the bimetal parts.