Convective Heat Transfer to Radial Direction Affected by Transverse Magnetic Field with Lateral Gas in Tig Arc Welding

Abstract

For joining the various metal, TIG (Tungsten Inert Gas) arc welding is used widely because this is the high quality joining technology. However, the shielding gas flows to leeward side in the case of the strong cross wind and the welding defect caused by the arc deflection occurs with the lateral gas. It is important that the preventing technology of arc deflection is developed. The arc deflection has not been elucidated quantitatively because the measurement of asymmetric temperature and the axial flow velocity distribution of arc is difficult at the only experiment. In order to prevent the arc deflection, the elucidation of heat transport affected by the arc shape is important using numerical analysis. Therefore, it is necessary that the asymmetric temperature distribution is quantified such as the arc deflection using 3 D rectangular coordinate system. In this study, the convective heat transfer to radial direction affected by the transverse magnetic field with the lateral gas in TIG arc welding was elucidated. The convective heat transfer defined as the enthalpy flow was calculated with the lateral gas and changing the transverse magnetic flux density using the electromagnetic thermal fluid (EMTF) simulation. As a result, the axial flow velocity increased with increasing transverse magnetic flux density within the prevention of arc deflection. Moreover, the total heat transfer derived from the enthalpy flow to radial direction decreased with increasing the axial flow velocity caused within the prevention of arc deflection.