Welding is one of the methods used in the metal connection process and is applied in the fields of construction and manufacturing machinery. One of the welding methods is GMAW. To improve the welding quality of GMAW, development is carried out in this welding process. in this study the welding method used is a conventional GMAW double layer with aluminum alloy welding material. This welding uses speed variations to determine mechanical properties, and microstructure with voltage (V) and current (A) is in a constant setting. Thus the importance of the welding speed factor on welding results can provide analysis to improve the mechanical properties of the 5052 aluminum alloy. The material to be connected with the welding process is aluminum alloy 5052 with a thickness of 5 mm. In this welding the variations determined are welding speeds of 6 mm / s, 7 mm / s, and 8 mm / s. While the fixed voltage parameters E = 23 V And I = 130 A. After the welding process is complete, the observations include measurement of distortion, measurement of hardness value (Vickers), tensile test, impact test, and micro structure. The results obtained from the tests carried out were variations in speed of 6 mm / s having the largest distortion value with a value of 1.79 mm. the greatest ultimate tensile strength value at 7 mm / s speed variation is 164.39 MPa. The highest hardness value at 62.64 VHN0.1 weld metal at a variation of speed 7 mm / s, on HAZ 58.1 VHN0,1 at 6 mm / s speed variation, on 63.07 VHN0,1 base metal at 8 mm speed variation / s. the highest impact strength is 0.29 J / mm2 at the speed of 8 mm / s.