The fatigue life of different welding shapes between plates of unequal thickness in pressure vessel was investigated from the point of local stress concentration at welding position.

On the basis of practical loadsupporting condition of large scale spherical vessels for water or oil storage,the integral hydorbulge forming technology of nonuniform thickness spherical vessels and a new method for measuring strain on inner surface of spherical vessels are discussed in this paper,and they are proved to be successful by means of experiment study.

The general situation of medium thickness slab continuous casting and rolling process in the world is simply introduced and some ideas are analyze

With the concept of equivalent plate thickness, we calculated the periodic electric field in a chain and the periodic charger in the plate surfaces.