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随着石油化工、冶金、城市煤气工业的发展,球罐的数量、容积不断增加,贮存介质的品种也日益繁多。由于球罐容积大、压力高以及介质的易燃易爆性,因此各个部门对其安全性也越来越重视,威胁球罐安全操作的最大隐患是建造过程以及使用期间出现的各种类型的裂纹。从本质上讲,球罐内壁焊缝区域的表面裂纹可分成两大类:第一类是由焊接引起的,一般认为这是由于焊接热循环过程造成的组织变化(淬硬、析出、晶粒
With the development of petrochemical industry, metallurgy and city gas industry, the number and volume of spherical tanks have been continuously increasing, and the varieties of storage medium have also been increasing. Due to the large volume of the tank, the high pressure and the inflammable and explosive nature of the medium, various departments are also paying more attention to its safety. The most serious threat to the safe operation of the tank is the construction process and various types of crack. In essence, the surface cracks in the weld area of the inner wall of the tank can be divided into two categories: the first one is caused by welding, which is generally considered to be due to the structural changes caused by the welding thermal cycle (hardening, precipitation,