Five basic methods are commonly used to examine finished welds: visual, liquid penetrant, magnetic particle, ultra-sonic and radiographic (X-ray). TÜV Rheinland has highly qualified inspectors who can perform non-destructive testing (NDT) of welds – either in house or at field locations – to assure the quality of your welds. Our inspectors are certified in accordance with ISO and SNT-TC-1A. All to ensure that the applicable standards are. Nondestructive examination (NDE) methods of inspection make it possible to verify compliance to the standards on an ongoing basis by examining the surface and subsurface of the weld and surrounding base material. Inspection is expensive, never 100% effective and may involve destruction of the component. It is. Destructive testing measures the physical properties of base metals and components in order to better understand a material's performance under certain conditions. These techniques help users identify weld defects or discontinuities, such as cracks, porosity, inclusions, incomplete fusion, and undercutting, among others, in welds that could lead. The tests described below have been developed to check the skill of the welding operator as well as the quality of the weld metal and the strength of the welded joint for each type of metal used in ordnance material.