Calculation induction of transversal magnetic paul, providing removing of drop from butt end of electrode at surfacing arc

Abstract

A computation method to determine the induction minimum level of the stationary transverse magnetic field (TMF) has been offered; given the field removing drops from the butt ends of electrodes 3, 4, 5mm in diameter that results in an increase of the electrodes melting productivity. Research has shown that building up under transverse magnetic field (TMF) results in the slant of the butt ends of the electrode, and TMF induction increasing the slant angle in relation to the horizon increases. The computation method takes account of the slant on the butt end of the electrode. The method of balance of the followings integral forces, acting on a drop at building up under TMF is used in the computation method: electromagnetic force resulting from building-up current in the drop and TMF induction transverse constituent interaction; the force and the drop weight force. The drop on the electrode butt end was approximated as a semiellipsoid. It has been stated that at the building-up current is equal to 500A, TMF induction of TMF, at which the drop tears away from the butt ends of the electrodes, does not much depend on the diameter of the electrodes and is approximately 20 mTl. Current increasing, induction of TMF diminishes. It is true for the height of the drop equal the electrode radius. The height of the drop reducing by one half, the induction is doubled. The calculated information was checked experimentally. THF induction is taken to be minimum if the electrode melting coefficient is increased by 5% as compared to that at hidden arc building-up at no-TMF conditions. The experimental and the calculated data agree very closely for 3 and 4mm diameter electrodes. For 5mm diameter electrodes the experimental data are less than the calculated data. Can it be explained that at melting 5mm diameter electrode the drops are bigger than at melting 3mm diameter electrode, that resulting in more effective induction. The data can be recommended for being used for hidden arc building-up with TMF