论文部分内容阅读
在工业锅炉受压元件中采用角焊(填角焊、无坡口角焊)连接,尽管有较长的应用历史,但由于单面角焊缝根部一般不能完全焊透,特别是无坡口角焊缝根本不可能作到全厚度焊透,因而长期以来,许多人总是担心焊缝根部的应力集中可能导致疲劳破坏。为此,在制订强度标准时,简单地用增大壁厚(大于1.5倍)的方法,来防止可能产生的疲劳破坏。另外,锅炉设计者、锅炉质检人员由于不甚了解角焊缝的实际耐疲劳能力,经常不建议采用角焊结构,有时会给元件结构及制造工艺增加一些麻烦。约于30年前,中国为了深入研究工业锅炉角焊缝强度,先后于哈尔滨(哈工大锅炉强度实验室;哈
In the industrial boiler pressure components using fillet welding (fillet welding, no groove fillet welding) connection, despite the longer history of the application, but due to the single-sided fillet weld root can not be fully penetrated, especially without groove fillet welding Seam penetration is not possible at all, so many have long been concerned that stress concentration in the root of the weld may cause fatigue damage. For this reason, in the development of strength standards, simply increase the wall thickness (greater than 1.5 times) to prevent possible fatigue damage. In addition, the boiler designer, boiler quality inspection personnel do not quite understand the actual fatigue resistance of fillet welds, often do not recommend the use of fillet welding structure, sometimes to the component structure and manufacturing process to add some trouble. About 30 years ago, in order to further study the strength of fillet welds in industrial boilers, China successively worked in Harbin (Harbin Engineering University Boiler Strength Laboratory; Harbin