Effect of welding procedure (welding position, number of layers, arc energy, and shielding gas type) on ANSI/AWS A5.20-95 E71T1 flux cored wire deposits

AbstractThe objective of the present work was to study the effect that the utilisation of different shielding gases (CO2 and an 80%Ar-20%CO2 mixture), arc energy, number of passes per layer (two and three), and welding position (flat and vertical up) have on the operational behaviour and the all weld metal properties for an ANSI/ AWS A5.20-95 E71T1, 1.2 mm diameter, flux cored wire. It was found that when welding using CO2, the all weld metal carbon, manganese, and silicon contents were lower and oxygen and nitrogen values were higher than the values found for these elements using the Ar-CO2 mixture. Tensile and yield strengths were lower in welds obtained using CO2. The same effect was observed for welds with two passes per layer. These strength properties were higher in the vertical up welding position than in the flat position. Hardness values were higher using Ar-CO2 and three passes per layer, in total correspondence with the tensile properties. Using CO2, the best Charpy V notch impact values were a...