为了防止液化石油气容器在使用中产生微小裂纹,采用自动焊接和焊后退火热处理是有效的。由于可以满足这种工作条件,近来卧式圆筒容器的制造有增加的趋势。为了提高圆筒的贮藏能力,容器也进一步向大型化发展。与此同时,发生了不能将全部焊缝同时退火的问题,因而出现了将容器的焊缝分段分步热处理的方法。这就是把前面工序完成的适当大小的区段退火后再组装焊接,然后将最终焊缝退火。 In order to prevent liquefied petroleum gas containers in the use of micro-cracks, the use of automatic welding and post-weld annealing heat treatment is effective. Due to this working condition can be satisfied, there has been an increase recently in the manufacture of horizontal cylindrical containers. In order to improve the storage capacity of the cylinder, the container is further enlarged. At the same time, there was a problem that it was not possible to anneal all the welds at the same time, thus resulting in a step-by-step heat treatment of the weld of the vessel. This is to anneal the appropriately sized sections of the previous process, and then the final weld is annealed.