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补焊是一个成本较大的项目,尤其在大型焊件例如压力容器的制造中。大型件的修补常常留下比原来裂缝问题更坏的焊缝。这些问题可包括焊缝的显微结构的损伤,也有外加的残余应力问题。通过过程修补去除裂缝,可以使这些问题减到最少。当然,一个或二个焊缝的消除以及用自动化焊接程序替换将比大型件的后补焊便宜得多。应用过程修补的最主要障碍是缺少有效的过程检验方法。声发射的过程临测表明,提供这种急需的工具是大有前途的。在过程焊接监测中成功地应用声发射,要求使用超前信号处理和
Repair welding is a costly project, especially in the manufacture of large weldments such as pressure vessels. Repair of large pieces often leaves the weld worse than the original crack problem. These problems can include damage to the microstructure of the weld seam and additional residual stress problems. Repairing cracks through processes can minimize these problems. Of course, the elimination of one or two welds and the replacement with an automated welding procedure will be much cheaper than after-welding for large parts. The main obstacle to applying process patching is the lack of an effective process test method. The acoustic emission process proves to be promising in providing such urgently needed tools. The successful application of AE in process welding monitoring requires the use of advanced signal processing and