The use of aluminum in the automotive industry and shipping is very widely used, one of which is AA5052 besides being lightweight and also resistant to corrosion. MIG is a connection method used, for good weld results, it is necessary to do an NDT test. This study aims to determine the defects in welding using the micro porosity radiography and macro for 2-layer MIG welding AA5052 with ER5356 electrodes. Aluminum plates measuring 400 mm x 150 mm are welded using conventional welding methods with variations in speed of 6 mm / s, 7 mm /, and 8 mm / s. Tandem welding with variations in torch distance of 18 mm, 27 mm and 36 mm. Other parameters used are I = 130A and E = 22V. After the welding process, the tests carried out include the radiographic test, and the macro micro porosity test. The results showed that in conventional welding the best conditions were found at variations in velocity of 7 mm / s with incomplete penetration 0.8 mm weld defects and 1-2 mm distributed porosity. porosity / mm2 of 5.37. The best results from tandem welding at a distance of 18 mm were found to be elongated cavity and 1 mm diameter porosity at 3 points, this was supported with the smallest porosity results per unit area compared to other torch distance variations with a porosity / mm2 value of 1.67.