Abstract
Flux cored arc welding (FCAW) is a semi–automatic or fully automatic welding method that is widely used for welding large and thick sections, especially in the flat position. The welding can be performed with shielding gas (FCAW–G) or without shielding gas (FCAW–S). A tubular filler wire containing mixture of mineral flux and powder in the core of the tube is supplied on reels and fed through the welding gun in metal inert gas (MIG) welding. The process is popularly used in construction and fabrication of carbon steel, low alloy steel weldment in power plant equipment. Hence in this paper effects of the welding parameters on the quality of weldment have been discussed based on the experimental data obtained. The welding was performed on metal plates of boiler quality of steel using a semiautomatic gas metal arc welding (GMAW) machine. To predict the weld quality, experiments were conducted based on three–factor five levels Taguchi orthogonal array design matrix. Parametric optimisation has been done based on radiographic test, visual inspection and tensile test results.
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