Melting Phenomena of Flux Cored Wire(Welding Physics, Process & Instrument)

概要

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Melting characteristics of flux cored wire is studied by the use of meauring techniques on high temperature resistivity, wire melting rate and heat content of droplet, as well as the high speed cine film technique. Factors influencing the melting phenomena, characteristics and polarity of power source, shielding gas, existence of flux or not, high temperature resistivity, are experimentally analyzed and precisely discussed. The simple equation indicating the melting rate of solid wire is applied to the case of flux cored wire and fairly good agreement is obtained between experimental melting rate and theoretical one. With constant potential power source the dependence of melting rate on the extension is strong compared with the one with constant current power source because of the difference in metal transfer mode. The melting rate in DCEN polarity is much higher than that in DCEP polarity due to the change in arc heat inputs to the metal sheath and flux pole. The effect of flux are also studied and it is made clear in comparison with the solid wire melting, the flux increases the heat content of wire and thereby decreases the melting rate of metal sheath, and the flux increases the equivalent voltage of melting by arc heating especially in DCEN polarity.
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