基于PDCA循环的焊后热处理工艺开发研究

发布时间：2018-03-25 19:56

本文选题：PDCA循环　切入点：焊后热处理　出处：《山东大学》2017年硕士论文

【摘要】：焊后热处理工艺是焊接工作完成后进行的一道重要工序,它的目的是消除焊接焊缝残余内应力、消除焊缝内残余氢及改善焊缝接头性能等。焊后热处理对于焊接质量保证至关重要。不同的焊接工作对于焊后热处理的要求不同,而焊后热处理针对不同的焊接工作有不同的实施形式。也就是说,不同的焊接工件结构、焊件材料、焊接方法等需要不同的焊接热处理工艺。所以,每一个工程项目的焊后热处理实施工艺都有其独一无二的特性。通常情况下,在工程项目实施前,需要进行一系列的焊后热处理工艺开发工作,以获得一套适合于本项目实施且符合设计要求的焊后热处理工艺参数。随着焊接结构的大型化、焊接厚度的增加、焊件材料对于温度的敏感性等因素导致焊后热处理实施变得越来越困难。多变的内外部条件排列组合会形成数量众多的结果,而焊后热处理工艺开发的目的就是为了在反复的试验过程中找到一套最适合于本工程实施要求的工艺参数。本文将PDCA循环理论与焊后热处理工艺开发相结合,形成了一套解决新工艺开发的管理思路。借助因果图等质量管理工具将焊后热处理实施困难的原因进行分解,找出根本原因,在PDCA循环理论的支持下,针对关键影响因素制定应对措施,推动PDCA循环并检查结果,然后针对偏差进行分析,再次制定应对措施,逐步循环改进,最终得到满足工程需要的一组工艺参数方法。在此管理思路下,以S电厂钢制安全壳焊后热处理项目为案例,对项目焊后热处理工艺实施存在的问题进行详细解析,得到影响焊后热处理工艺实施的关键原因。依据PDCA循环开展试验并最终得到一套实施项目焊后热处理工艺的参数方法,同时也验证了 PDCA循环理论在项目新工艺开发中的应用意义。最后总结了本文研究成果的结论和对未来的展望。
[Abstract]:Post-welding heat treatment process is an important procedure after the completion of welding work, and its purpose is to eliminate residual internal stress of welding seam. Elimination of residual hydrogen in weld seam and improvement of weld joint properties etc. Post-weld heat treatment is essential for welding quality assurance. Different welding work requires different post-weld heat treatment. In other words, different welding workpiece structure, welding material, welding method and so on need different welding heat treatment process. Each project has its own unique characteristics of post-weld heat treatment implementation. Usually, a series of post-welding heat treatment process development work is required before the implementation of the project. In order to obtain a set of post-welding heat treatment process parameters suitable for the implementation of the project and meet the design requirements. As the welding structure becomes larger, the welding thickness increases, Factors such as the sensitivity of welding materials to temperature make it more and more difficult to implement post-welding heat treatment. The combination of internal and external conditions can result in a large number of results. The purpose of post-welding heat treatment process development is to find out a set of process parameters that are most suitable for the implementation of the project during repeated tests. This paper combines the PDCA cycle theory with the development of post-welding heat treatment process. A set of management ideas to solve the problem of new process development is formed. With the aid of quality management tools such as causality diagram, the causes of the difficulties in the implementation of post-welding heat treatment are decomposed, and the root causes are found out. With the support of PDCA cycle theory, According to the key influencing factors, the countermeasures are made, the PDCA cycle is promoted and the results are checked, then the deviation is analyzed, and then the countermeasures are formulated again, and the improvement is made step by step. Finally, a set of process parameters to meet the needs of the project is obtained. Taking the post-welding heat treatment project of steel containment in S power plant as an example, the problems existing in the implementation of the post-welding heat treatment process of the project are analyzed in detail. The key factors affecting the implementation of the post-welding heat treatment process are obtained. According to the PDCA cycle, the test is carried out and a set of parameters for the implementation of the post-welding heat treatment process of the project is obtained. At the same time, it also verifies the application significance of PDCA cycle theory in the new process development of the project. Finally, the conclusion of this paper and the prospect for the future are summarized.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG441.8;TM62

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