MIG and TIG welding speed influence on distortion of AA5083H116 materials

Abstract

The welding process causes localized heating at the spliced portion followed by gradual cooling process. The heat input depends on the current, voltage, and welding speed. Local heating and cooling rate causes a volumetric change of the material, which resulted in the spread of heat, distortion, and residual stresses. Distortion may cause aesthetic changes and the size of the welded area. The purpose of this study is to investigate the effect of welding speed on material distortion of the AA5083H116 by MIG and TIG welding using ER5356 electrodes. This study utilizes AA5083H116 material. The MIG welding speeds were varied between 8, 10, and 12 mm/s while the TIG welding speed were 0.8, 1.3 and 1.8 mm/s. MIG and TIG welding was performed using voltage of 19 V, torch angle 45o, and argon gas flow rate of 17 liters/ minute. After finishing the welding process, X-ray radiography using LORAD LPX-200 was performed in STTN BATAN Yogyakarta. Furthermore, the distortion measurements were taken using a dial indicator on the bed of milling machine. The measurement results were plotted in graph with the axis of the distance measurement vs distortion for MIG and TIG welding. The welding results showed that welding speed of 1.3 mm/ s pass the test radiography in MIG and TIG welding, and the distortion is larger on the lower speed welding. The highest value is 5 mm for MIG welding and the lowest is 0.4 mm for TIG welding. The comparison also shows that TIG welding generally cannot be conducted at high speed and by changing the order of welding in MIG, the distortion can be reduced from near 4 mm to 2 mm. This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.