The Effect of Electrode Angle on the Backward Directional Longitudinal Against Penetration Percentage

Shielded Metal Arc Welding (SMAW) is one of the liquid welding processes (fusion welding) that produces a homogeneous fusion electrode with base metal (base metal), which caused by an electric arc generates high heat to melt and metal). simultaneously protected shielding gas from chemical reaction flux. The depth formed determined input, angle direction. research was conducted at Mechanical Engineering Laboratory Padang Institute Technology. used low carbon steel ST 37 thickness 10 mm length 100 mm. width carried out on surface in flat position, type connection (weld type) surfacing weld 4 lines, each strip having distance 20 Weld AWS E6013 specifications diameter 3.2 SMAW machine AC current voltage 30 V. 85 A. measured between line 75o, 85o, 90o. backward direction where draws fluid into path normal height equal electrode. From results, penetration presentation will be obtained, namely ratio width. results obtained speed: 2.48 mm/s for 2.49 85o 2.51 Heat input 750 1015.93 J/ , 1024.20 J/mm 90o J/mm. comparison fusion, it obtained; has 9.85%, better than 8.43%, 8.35%..