Micro plasma welding

Plasma arc welding (PAW) is an advancement over the gas tungsten arc welding (GTAW) process and can be used to join all the materials that are joined using the GTAW process, with lower damage to the workpiece in terms of HAZ, distortion, and residual stresses. One of the variants of the PAW process uses current in the range of 0.1–15 A, which enables precise control over the process parameters with allowable variation in the weld current as minimum as 100 mA is a micro-plasma arc welding (µ-PAW) process, widely used for joining of thin sheets.

Current research interests:

1. Theoretical prediction of residual stresses, including phase transformation and transformation induced plasticity. 

2. Effect of pulse shaping on weld morphology and the corresponding effect on segregation and secondary phase formation. 

3. Influence of welding techniques and solidification parameters on residual stress development.