Abstract
It is necessary to reduce the hydrogen permeation through the welded joint in order to improve reliability of vacuum apparatus. For the base metal and the weld test specimens of stainless steel SUS304 of various thicknesses, hydrogen permeation quantification tests were carried out. As the result, it was revealed that the permeation quantity at the weld zone was about 4∿6 times of that of the base material. The relationship between the hydrogen permeation quantity and plate thickness was analyzed on the basis of diffusion theory, which showed that the hydrogen permeation flux was inversely proportional to the plate thickness, and this almost agreed with the experimental results.
