This research was conducted to know the mechanical properties of aluminum, brass and copper material by using brazing welding by using lap joint method. In this research the method used for this testing process is chemical composition test, micro photo test, and tensile test. The basic material used is aluminum plate, brass, and copper which is then welded brazing by joint lap joint method. Based on the research that has been done, the authors have obtained the test results. In the composition test made aluminum material contains some of the highest composition of Aluminum (Al) 97.41%, for brass material contains some composition that is copper (Cu) 64.2%, Zinc (Zn) 34.8%, while copper containing copper composition (Cu) 98.3%. At the tensile test conducted the higest strenght of brass with a value of 281,335 Mpa, The results of micro-photos obtained on Aluminium, Brass and Copper meterials have not changed the microstructure because the etching process has not been perfect, resulting in a micro photo test process that does not look at the micostructure
