step to use rag wipe liquid penetrant out to welded surface before developer spray into the weldedwith process penetrant testingp

accessories aerosol architecture assembly cleaning closeup concept construction defect destructive developer equipment experience factory gloves hand industrial industry inspection inspector liquid man material metal non nondestructive object orange penetrant penetration process professional protection quality rag remove repair safety skills solvent spray steel step structure surface technical technology testing testingndt testingpt tools use view weld welded welder welding wipe work