Effect of Heat Dissipation to Size and Shape of GMAW in Carbon Steel Workpiece of Different Thickness

Abstract

Study on the effect of heat dissipation on weld profile in workpiece at different thickness considering of width, deep welding rate, swell of welded line, and affected area of heat dissipation. ASTM-A36 carbon steel workpieces at 3-9 mm were joined via Gas Metal Arc Welding (GMAW) to examine heat input in the workpieces by comparing wire feed speed and travel speed at 42.33-59.26 and 4.23-6.35 mm/sec, respectively. The results showed that there were differences in weld profile due to heat input and heat dissipation in cross-sectional areas of the various thickness workpieces. High welding heat rate gave high deep welding rate, low swell of welded line, and wide welded line whereas low welding heat rate provided low deep welding rate, and high swell of welded line. Besides, thinner workpiece conferred wider affected area of heat dissipation than the thicker one.