压力容器焊接接头探伤检验的工艺分析.doc

毕业设计说明书 毕业设计题目：压力容器焊接接头探伤检验的工艺分析 系 部： 专 业： 班 级： 学生姓名： 学 号： 指导老师： 2011年5月1日 摘 要 通过对16MnR焊接性的实验分析，发现其在焊接过程中极易产生结晶裂纹，严重影响了焊接质量。通常，我们通过对焊缝金属化学成分的控制和减小焊接应力的作用两大方面来防止结晶裂纹的产生。我们通过开不对称X形坡口等工艺措施来尽量防止结晶裂纹的产生。 焊后，我们须要对焊缝进行探伤检验分析，综合各个探伤方法的特点以及被检焊缝的特点，我们决定采用超声波来检验焊缝质量，为了保证良好的声学接触、提高检测的准确性，在检验之前，我们须要对焊缝表面进行一些处理，处理合格后方可进行探伤。 通过选择合适的K值、频率、耦合剂检测出焊缝的缺陷位置和缺陷大小，按照缺陷的等级分类来对焊缝质量进行评定。通过实验检测，本工艺是合格的。 Abstract Based on the experimental analysis of 16MnR weldability, we finds the welding process of susceptible can easily produce solidification cracking, seriously affected the quality of welding. Usually, by controlling the chemical composition of weld metal or reducing the welding stress cracks to prevent crystallization. By asymmetric X-shaped groove opening such technological measures to try to prevent crystallization cracks After welding, weld testing we need to test for analyzing, synthesizing the characteristics of various testing methods and characteristics of welds was seized, we decided to use ultrasound to examine the weld quality, in order to ensure good acoustic contact, to improve detection accuracy, In the test, we need to do some processing on the weld surface, treatment can be carried out after passing inspection. K value by selecting the appropriate frequency, the coupling agent to detect weld defects in the defect location and size of defect classification according to the quality of the welds were assessed. Through experimental testing, the process is qualified. 目录 1绪论…………………………………………………………………………4 2 16MnR焊接性分析…………………………………………………………5 2.1化学成分…………………………………………………………………5 2.2力学性能…………………………………………………………………5 2.3特性………………………………………………………………………5 2.4焊接过程中容易出现的问题及解决办法………………………………5 3制定焊接工艺评定指导书…………………………………………………11 4 焊接探伤检验工艺分析……………………………………………………17 4.1超声波探伤特点 ………………………………………………………17 4.2 超声波探伤操作 ………………………………………………………18 4.3 缺陷等级评定 …………………………………………………………22 5 评定报告…………………………………………………………………23 6 结论………………………………………………………………………26 致谢…………………………………………………………………………27 参考文献