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随着锅炉参数和容量的进一步提高,对锅炉管道的焊缝根部要求愈来愈严,它不仅要求焊缝根部要焊透,而且还要求内表面均匀平整,以免影响管内介质的流速和发生腐蚀,在原来某些工艺无法满足上述要求下,设计上规定允许未焊透深度不超过壁厚的15％,最大不得大于2mm,即使这样,对于经过专门培训的焊工来说,要实现内表面平齐还是困难的。为了解决这一问题,在日本、西德有好多工厂,集箱采用了TIG封底法。国内望亭电厂,江苏电力三公司等单位也已使用这种方法,我们在上述基础上进行了集箱环
With the further improvement of boiler parameters and capacity, the requirement for the root of the weld of the boiler pipe is more and more strict. It not only requires penetration of the weld root, but also requires the inner surface to be even and flat so as to avoid affecting the flow rate and corrosion of the medium in the pipe , In the original process can not meet some of the above requirements, the provisions of the design allows the penetration depth of not more than 15% of the wall thickness, the maximum not more than 2mm, even so, for specially trained welders, to achieve the inner surface flat Qi is still difficult. In order to solve this problem, in Japan, there are many factories in West Germany, and the header box adopts the TIG back cover method. Domestic Wangting Power Plant, Jiangsu Electric Power Company 3 and other units have also used this method, we conducted on the basis of the header ring