Along with technological developments in the field of construction , the use of steel material which is more extensive in the industry and also enable technology welding techniques are constantly evolving . Considering that the filler metal should be equal or nearly equal to the metal to be welded , the use of a filler metal of the parent metal is an alternative to providing a filler metal that has similarities with the parent metal. In this study using low carbon steel plate . The test material is based on the standard JIS Z 2201test piece No. 6 using an electric welding current variation of 80 , 90 and 100 ampere then proceed with tensile test and microstructure observation. Test specimen will do some research first done the cutting and manufacturing workmanship hem V for the welding process with a variety of different flows. After that, then do tensile test specimens 9 and 1 of the parent metal (raw material), which consists of three specimens of 80 amperes, three specimens of 90 amperes and 100 amperes 3 specimens. The results of tensile tests on a variable flow at an average current of 80 A at 534.7 tensile stress (N / mm²) and a final length 97.52 (mm), current 90 A 614.00 tensile stress (N / mm²) and the long end 101.65 (mm), the current is 100 A with 567.43 tensile stress (N / mm²) and 99.38 final length (mm). This shows that the current variation 90 A (ampere) better and efficient because it produces a higher tensile power compared with a current of 80 A and 100 A. The observation of microstructure in the weld region with variable currents seen many particles of perlite, ferrite and cementite , In regions dominated by particles HAZ pearlite and ferrite particles is larger than the current 100 amperes and 90 amperes flows 80.