Abstract:
This research aims to study the effect of welding parameters on tensile strength and microstructure of finned tube production of the ASTM A192 with the fin material of JIS G3141 SPCC by using the High Frequency Resistance Welding Process (HFRW). Tubes diameter is 38.1 mm with thickness 3.2 mm and Fins thickness is 1 mm with height of 16 mm. The welding joint is butt weld tee joint. The relationship between the HFRW welding parameters (current (A), voltage (kV), speed (rpm) and heat input and mechanical properties were clarified. From the experimental results it was found that the solidified liquid (penetrator) on both side finned was depended on the heat input during welding. The area fraction of penetrator can be recommended in the range of 20-30mm2 for good adhesive between fin and tube. The welding parameters of current 7A, voltage 10kV with the tube rotate speed 200rpm showed good tensile strength (390-400Mpa) however, for manufacturing the productivity is low. When increase welding parameters of current 9A, voltage in range of 13-15kV with the tube rotate speed 250-270rpm showed complete fusion of weld joint and high tensile strength (400-500Mpa) with higher productivity. The measurements of weld width and depth distance in HAZ into the tube thickness were explained by compared between the macro and micro structure examination. The results under this research can applied to improve the quality and productivity of the finned tube by the HFRW process.