Liquid metal downflow in an inclined heated tube affected by a longitudinal magnetic field

2015 ◽  
Vol 51 (4) ◽  
pp. 673-684 ◽  
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Longitudinal Magnetic Field ◽  
Heated Tube

scholarly journals OPTIMAL PARAMETERS OF A LONGITUDINAL MAGNETIC FIELD PROVIDING MIXING OF THE MELT IN A BATH IN ARC SURFACING

2019 ◽  
pp. 7-15
Author(s):  
Aleksandr Razmyshlyaev ◽  
◽  
Marina Ahieieva ◽  
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Longitudinal Magnetic Field ◽  
Extreme Points ◽  
Entire Length ◽  
Process Efficiency ◽  
Optimal Parameters ◽  
Structural Components ◽  
Service Characteristics ◽  
Submerged Arc

Urgency of the research. One of the ways to improve the submerged arc surfacing process efficiency with wire is to use a control longitudinal magnetic field. (LMF). It is possible to control the geometrical dimensions of the surfaced beads, the electrode wire melting productivity increases, grinding of the structural components of the weld metal is achieved. Target setting. For effective mixing of the melt in the bath in arc surfacing with the act of the LMF, it is necessary for the melt to reach the extreme points of the tail end of the weld bath. It is necessary to determine the velocity of flows induced in the melt under the action of LMF for different frequencies and induction LMF. Actual scientific researches and issues analysis. It has been shown in recent publications that for grinding the structural components of the surfaced metal and increasing its service characteristics during arc surfacing with the act of alternating LMF, it is necessary to ensure the mixing of the melt in the bath along its entire length. Uninvestigated parts of general matters defining. The works that would deal with the mixing of the melt in the bath along its entire length during arc surfacing with the act of the alternating LMF are practically absent. The research objective. Determination of the optimal parameters of the alternating LMF, which would ensure effective mixing of the metal in the bath at submerged arc surfacing (welding) with wire. The statement of basic materials. It was assumed in the calculation method that through the head of the bath (before the arc) 90% of the total surfacing current. The dimensions of the recess (crater) under the arc in the liquid metal are determined with the help of refractory inserts. The values of velocity and acceleration, which reaches the liquid metal under the action of alternating LMF are determined. Conclusions. The optimal values of induction and frequency of LMF, providing effective mixing of the melt in the bath at submerged arc surfacing are determined.

Features of Arc Surfacing Process in a Longitudinal Magnetic Field

2014 ◽  
Vol 682 ◽  
pp. 313-318 ◽  
Author(s):  
Alexander D. Razmyshlyaev ◽  
Marina V. Ahieieva
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Penetration Depth ◽  
Longitudinal Magnetic Field ◽  
Parent Metal ◽  
Magnetostatic Field ◽  
Maximum Gain ◽  
Electrode Wire ◽  
Magnetic Wires ◽  
Submerged Arc

The electrode wire melting coefficient (αm) is determined for the submerged arc surfacing and welding in a longitudinal magnetic field (LMF) under reverse and direct polarities with ferromagnetic and paramagnetic (non-magnetic) wires. The maximum gain in the wire melting coefficient is achieved in the magnetostatic field assisted surfacing and welding. The effect reduces with the LMF frequency increasing to 4-6 Hz and virtually does not change with the further increase to 50 Hz. The electrode wire melting coefficient is shown to increase depending on magnetic properties.It has been established that the penetration depth of the parent metal reduces at the 50 Hz LMF surfacing when the longitudinal induction exceeds 65 mT.The constant and alternating LMFs reduce the speed of in-bath liquid metal flows, which results in the reduced parent metal penetration efficiency at surfacing.

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