棱角度是锅炉压力容器制造、检验中所需检测的一个重要质量指标,现行标准中,棱角检测均采用样板法,即用带有标准圓弧的样板与实际简体比较获取二者的差异—棱角度。样板法存在三大缺点,其一,样板制作及检测读数的精度均较低;第二,所需样板多,难以适应多品种压力容器尤其是在役压力容器的检测需要;第三,受到棱角方向和容器结构限制,尤其是焊缝、错边存在时的棱角不易测量等。 Angular angle is the boiler pressure vessel manufacturing, testing an important quality required for testing indicators, the current standard, the corners are detected using the sample method, that is, with a standard arc and the actual comparison of the template to obtain the difference between the two - angular degree. There are three shortcomings of the sample method. First, the precision of the sample preparation and the test reading are lower. Second, the required samples are difficult to meet the testing needs of multi-species pressure vessels, especially in-service pressure vessels. Third, Direction and container structure constraints, especially the weld, the edge is not easy to measure the wrong edge and so on.