Paper
A Review on Plasma Welding/Cutting with and without Velocity Shear Instability in Plasma
- Authors:
- R. K. Tyagi
- Abstract
- Engineering applications of plasma welding technology hold a marked significance in manufacturing industry. The effect of variation of electric field, magnetic field and other parameters on plasma heat flux, Debye length, temperature of ions etc. has been demonstrated in selected lead range for plasma welding/cutting for metallurgical and non metallurgical use. This review article analyses the experimental and theoretical effect of different plasma factors namely magnetic field , homogenous DC electric field, shear scale length, temperature anisotropy, heterogeneity in DC electric field and density gradient on the heat flux, Debye length, temperature and the number of ions. In this process, effectiveness of heat transfer from plasma to work-piece/electrode depends upon parameters such as temperature of ions, Debye length, number of ions striking the work surface etc. which can be controlled according to specific need by adjusting magnetic, electric field and aforementioned plasma factors without making any dimensional change to the machine. Through plasma welding, defects such as gas porosity, formation of oxide films, tungsten and other inclusions, hot and cold cracks, lack of fusion defects and cavities are reduced. Plasma welding/ cutting process is applicable to a broad range of samples from very small to large sized components by restricting to a set of parameters suited to them.
- Keywords
- Plasma; Velocity Shear Instability; Plasma Welding; Plasma Metal Cutting; Heat Flux
- StartPage
- 41
- EndPage
- 49
- Doi