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本文概述了更换大型高炉部分炉壳或挖补施工孔时,在焊缝中产生应力的机理;详细论述了更抉及挖补部分为矩形或圆形断面时,用间接法测定局部炉壳在焊接过程中由于焊缝收缩引起的变形量,或在焊接后用钻孔法使炉壳由于焊接产生的内应力重新分布所引起的变形量,作为确定焊缝应力的理论根据,导出了计算式。利用这一计算式对已有炉壳计算得出的结果,为以后合理设计炉壳、合理设计大修施工加固方案,提供了一个不可忽视的过去未加考虑的附加应力参数。本文还可以用来确定其它构件在周边固定焊接时焊缝的应力,并为鉴定高压容器在使用一段时间后的安全承载能力提供依据。
This paper presents an overview of the mechanism of stress generation in the weld when replacing part of the furnace shell or excavation hole in a large blast furnace, and discusses in detail the method of indirect method for determining the local furnace shell during the welding process The amount of deformation due to the shrinkage of the weld or the amount of deformation due to the internal stress rearrangement caused by the welding by the drilling method after welding are used as the theoretical basis for determining the stress of the weld and the calculation formula is derived. Using this calculation formula to calculate the existing furnace shell, reasonable design of the furnace shell and rational design overhaul reinforcement program provide a non-negligible additional stress parameter in the past. This article can also be used to determine the stress of other components in the fixed welding around the perimeter, and to provide a basis for identifying the safe carrying capacity of the high pressure container after being used for a long time.