In this research, a comparison between Soldering and Brazing welding of pure copper metal using a (Zn-Sn) alloy filler was numerically investigated. The welding operations on the eight pieces with dimension (30mm x 20mm x 2mm) were carried out used (Auto Desk Inventor program) to prepare four samples, while the simulation was conducted on these samples by utilized the (COMSOL Multiphysics 4.1 program) to investigate the heat distribution and tensile stress. The simulation study results showed that the thermal distribution of Soldering welding was less than that of the Brazing welding in the area between (40-60 mm) and the maximum temperature of Soldering welding in that region was (405 °C), while the highest temperature for the Brazing welding in the same area reaches to (449 °C). The total displacement of the Soldering welding was up to1.9 x10-7 mm greater than that of the Brazing welding when the shedding stress equal to 5x104 N/ m2

The compression characteristic of an (AL-4% CU) alloy reinforced with different particles (boron carbide, silicon carbide, and titanium carbide) was numerically studied. For this purpose, a model was performed using COMSOL Multiphysics 4.1. Hence, three samples were selected and reinforced with carbide particles equal to 20 microns’ in diameter and then compared with that one not reinforced. An axial load of 20 Newton was applied for all samples from both sides. The results showed that the alloy (AL-4% CU) reinforced with boron carbide particles has the highest compressive resistance compared to the other reinforced particles. The elongation of boron carbide, silicon carbide and titanium carbide particles were 1x10−7mm, (1.3*10−7 mm) and (1.5*10−7 mm) respectively, while it was (5.5*10−8 mm) for not unreinforced particles.