2006 Volume 47 Issue 546 Pages 591-595
To develop long-life welded bellows used under different pressure conditions, that is, atmospheric pressure and a high vacuum applied to the inside and outside of the welded bellows, respectively, finite-element simulations of the compression process of the welded bellows (Hastelloy C-22, 460mm in external diameter, 370mm in internal diameter, 0.475mm in thickness) with an inclined external edge are carried out. The results are as follows. The pressure difference opens the external section of the welded bellows up and down. The opening angle decreases as the angle of the inclined section increases. Therefore, the stress amplitude at the external edge during the compression process decreases as the angle of the inclined section increases. Welded bellows with an inclined external edge are made for a durability test and they do not break down during the test of 1,200,000 cycles.
