江苏仪征分输站5万m~3油罐是日本设计的,其龟甲部是由15mm厚的SPV50Q材质的边缘板和12mm厚的SS41的底板组成。龟甲缝组对、焊接的好坏直接影响整个底板凸凹变形,一天24h中由于温度的变化底板有时处于膨胀状态,有时处于收缩状态,给施工带来困难。如果在温度较低时的收缩状态下组焊,整个底板的凸凹度就会很大,甚至超标。这是因为底板处于收缩状态组对、焊接时可能变形很小, Yizheng Sub-station, Jiangsu 50,000 m ~ 3 tank designed in Japan, the tortoise shell is composed of 15mm thick SPV50Q edge material and 12mm thick SS41 floor composition. Tortoiseshell seam group right, the welding directly affects the quality of the entire floor convex and concave deformation, 24 hours a day due to changes in the temperature of the floor is sometimes in an expansion state, sometimes in a contracted state, to the construction of the difficulties. If the welding temperature is low when the state of contraction, the entire floor of the convexity and depression will be great, or even excessive. This is because the bottom plate in the contracted state of the group, may be deformed during welding is small,