Influence of the frequency of transverse magnetic field upon productivity of electrode wire melting at submerged arc surface deposition

Abstract

One of methods increase of coefficient fusion of an electrode wire is influence of a transverse magnetic field (TMF). Data on influence of a longitudinal magnetic field are known. However influence of frequency of TMF on coefficient of fusion of ferromagnetic and not magnetic materials at arc welding and a submerged arc under gumboil isn't investigated.

For creation of TMF used devices with P-shaped ferroserdechnik with coils. The IE TMF device was placed over welding plates from not magnetic materials in such a way that the distance from the lower end faces of cores of the device made 25 mm. Researches carried out a wires of SV-08GА and 12H18N10T with a diameter of 3, 4 and 5 mm when using. For power supply of coils used either the rectifier of direct currents or the generator of heteropolar impulses to 50 Hz inclusive. Before welding performance the induction of TMF was measured under an electrode at a plate surface. Measurements carried out a universal teslametr with the Hall sensor with measuring base 0,9×0,9mm.

At a submerged arc used the ADS-1002 machine gun and the VDU-1202 rectifier (with the falling external characteristic). Submerged arc made on the return polarity on plates of steel of St. 12X18H10T of a wires Sv-08GA under gumboil of AH-348A and under AH-26P gumboil at a submerged arc of a wire of

Sv-12H18N10T. Submerged arc carried out with influence and without influence of TMF. In all experiments submerged arc mode parameters without influence of TMF were established previously on pointer devices and they made: for de = 3 mm: In = 340 … 350 A; de = 4mm: In = 460 … 480 A; de = 5mm: In = 700 … 720 A (at identical values of tension of an arch of Ud = 30 … 32 V and speeds of a submerged arc of Vn = 27 m/h). As at inclusion of TMF current of a submerged arc decreased, in this case increased the speed of giving of an electrode wire that tension of an arch was in Ud limits = 30 … 32 V. The duration process of a submerged arc made not less than 30 pages.

It is shown that the maximum increase coefficient fusion of a wire happens at a submerged arc to influence of a constant magnetic field. The effect of influence decreases at increase in frequency to 12 Hz, practically doesn't change at increase in frequency of a field to 25 Hz and slightly increases at further increase in frequency of a field to 50 Hz. The maximum increase coefficient of fusion an electrode wire makes 30 … 35% at the size of a cross component of induction 30 mТl constant TMF.