Effect of Welding Parameters of FCAW Process and Shielding Gas Type on Weld Bead Geometry and Hardness Distribution(Materials, Metallurgy & Weldability)

概要

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Flux cored arc welding (FCAW) process is characterized with its high deposition rate and productivity. Knowledge and control of the operating parameters in FCAW are essential if high production rates and welds of good quality are to be consistently obtained. These parameters include arc voltage, welding current, electrode stick-out and travel speed. These operating parameters affect the temperature distribution, weld bead geometry, microstructure of heat affected zone (HAZ), hardness and penetration. Very limited experimental data regarding cooling rate after welding, by FCAW process is available in the literature. Thus, in this paper, the cooling rate after welding was measured experimentally, as a function of welding parameters and its effect on HAZ Hardness examined. Penetration is one of the most important factors controlling hot cracking susceptibility especially in the case of welding thick sections. This paper describes an investigation of the effect of operating parameters on the penetration. An empirical formula is developed to estimate the amount of penetration as a junction of operating variables.
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