In comparison to MAG weld seams, TIG weld seams are basically
more convenient to PT application and the cleaning is easier after-
wards. If PT is foreseen TIG should used as the welding procedure.
PT tested components should be baked out after the cleaning
in a vacuum chamber at min. 150 ◦ C, especially if the components
should be used at high temperatures later. For simple components
few hours are sufficient.
This investigation was performed with one special PT medium.
Other test media may show a different behavior and therefore, they
should be investigated in a similar way before they are used for
vacuum- or UHV-components.