The surface area of a metallic substrate may first be painted with {HEAD ~ a paint material} suitable to generate the plasma, which results in shock waves to form {TAIL ~ the region} having deep compressive residual stresses 
The surface area of a metallic substrate may first be painted with { HEAD ~ a paint material } suitable to generate the plasma , which results in shock waves to form { TAIL ~ the region } having deep compressive residual stresses
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH