哈尔滨理工大学专科生毕业论文哈尔滨理工大学荣成学院专科生毕业设计题 目：ZG270-500焊接性及裂纹修补 专业年级： 08级焊接技术及自动化 学生姓名： 巩超 学 号： 0801090211 指导教师： 杨丽丽 哈尔滨理工大学荣成学院完成时间： 2011年 5月 25日哈尔滨理工大学荣成学院专科生毕业设计（论文）评语学生姓名：巩超 学号：0801090211学 院：荣成学院 专业：焊接技术及自动化任务起止时间：2011年5月13日至2011年6月15日毕业设计（论文）题目：ZG270-500的焊接性及焊缝裂纹修补指导教师对毕业设计（论文）的评语：指导教师签名： 指导教师职称： 评阅教师对毕业设计（论文）的评语：评阅教师签名： 评阅教师职称： 答辩委员会对毕业设计的评语：答辩委员会评定，该生毕业设计（论文）成绩为： 答辩委员会主席签名： 职称： 年 月 日哈尔滨理工大学荣成学院专科生毕业设计（论文）任务书学生姓名：巩超 学号：0801090211学 院：荣成学院 专业：焊接技术及自动化任务起止时间：2011年5月13日至2011年6月15日毕业设计（论文）题目：ZG270-500焊接性及焊缝裂纹修补毕业设计工作内容：铸钢是生产中常用的材料,但是由于其成分中含有杂质较多,铸造过程中冷却缓慢,使其组织粗大偏析比较严重给焊接带来困难.本文通过对ZG270-500及其焊接接头的常见缺陷进行分析，选用适当的焊接工艺参数进行焊接，并对焊后裂纹进行探伤及修补。1、了解毕业设计的内容，查阅资料（5月13日5月17日）2、对铸钢的焊接性及焊接工艺进行分析，总结ZG270-500的焊接工艺及修补措施.撰写题纲（5月17日-5月19日）3、撰写论文（5月20日-5月21日）资料：1、吕烨，许德株 .机械工程材料.第三版.北京：高等教育出版社，2008.62、刘会杰 .焊接冶金与焊接性.北京：机械工业出版社，2007.33、钟廷志，曹占伦，刘东明 .新编常用金属材料手册.北京：人民邮电出版社，2008.5指导教师意见： 签名：年 月 日系主任意见：签名：年 月 日ZG270-500的焊接性及焊缝裂纹修补摘要ZG270-500的碳当量约为0.45%，从碳当量上看焊接性尚可。但由于其制作是通过铸造而来，其显微组织和性能有别于普通的碳素结构钢，铸锭的组织中存在裂纹、偏析等缺陷，使焊接过程比普通碳钢复杂一些，尤其是焊接裂纹和偏析在焊缝及热影响区中极易出现。本文针对ZG270-500焊接时长出现的缺陷，从其成分和显微组织进行分析，最后总结出一套完整 的焊接参数和焊接工艺。另外真对已出现的裂纹根据前面焊接性的分析，整理出一套裂纹的修补工艺提。关键词ZG270-500；焊接性；裂纹补焊不要删除行尾的分节符，此行不会被打印Opinions and suggestions on the partys mass line educational practiceAccording to the central and provincial, municipal unified deployment, according to municipal Party committee about carrying out the partys mass line educational practice activity in the citys implementation opinions, the spirit of the partys mass line educational practice activities from 20* in January to 99 months, carried out at all levels of departments and directly affiliated institutions and grass-roots party organizations. According to my actual County, the county to carry out the education practice put forward the following implementation opinions.First, the overall requirementsCounty county education practice to the eighteen Party of eight, the spirit of the the third Plenary Session of the 18th CPC Central Committee as the guidance, conscientiously implement the spirit of general secretary Xi book series of important speech, earnestly implement the Central Committee really, opinions and advice , party implementing the guiding ideology of opinions to determine the objectives and requirements, step method, in accordance with the look in the mirror, dress up, wash bath, cure treatment, the general requirements of for the people pragmatic honest people as the theme, in carrying forward the spirit of Zhuanglang Zhuang, improve their work style, service to the masses of the people, the foundation of consolidating grassroots, promote transformation across efforts, to further implement the central eight regulations and The opposition party and government austerity waste regulations , double section provincial regulations, municipal provisions of the twelve plan and the implementation measures for on improving the work style of close ties with the masses law, highlight style building, carry out the whole wind spirit, resolutely oppose formalism, bureaucracy, hedonism and wasteful extravagance to solve the problems, Party members and cadres of the style and the masses of people strong, the Ministry of Party members and cadres to further improve their thinking and understanding, to further change the style of the wind, the masses to close, honest and pragmatic people honest image to further establish the foundation to further reinforce the basic level. Style of the building of the new results to promote the construction of a powerful force of the county and the ecological culture of the county and county construction.In educational practice activities of the unit is mainly: the county and below county departments under the organs, enterprises and institutions directly under the township, street, and community, village, non-public economic organizations, social organizations and other grass-roots organizations. Agencies and branches, each single unit, follow the rules on internal institutions. Educational practice with step by step.To adhere to the county leadership, leadership and leading cadres to focus on outstanding catch to directly contact the service of the masses of law supervision departments and window units, service industry, educational practice, pay attention to grasp the heavy towns, streets and villages, community education activities and the masses of grassroots groups in close contact to strengthen, and the majority of Party members, cadres and the mass line line Marx doctrine view of the masses and the partys education.Always speak seriously as a basic attitude, adhere