Expansion Joing Product Testing: Dye Penetration Testing
Objective: This test is performed to insure there are no weld defects such as surface cracking or weld discontinuities before and after forming the bellows.
What We Do: The weld surface is thoroughly cleaned and a red penetrant dye is applied to the surface of the weld and allowed to soak for a period of time. The dye is then removed and a white powder is sprayed on the weld surface that performs a blotting action.
After Completion: An indication of the dye with a white background characterizes the weld surface discontinuities of the bellows longitudinal seam weld. This testing before and after the bellows forming process ensures a sound quality bellows seam weld.