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Reasons and countermeasures for “marking problem” during the production of double-walled copper-brazed steel tubes

Reasons and countermeasures for “marking problem” during the production of double-walled copper-brazed steel tubes

作     者:YAN Yuanyuan LIANG Gaofei WANG Guodong LIAN Fuliang 

作者机构:Research InstituteBaoshan Iron & steel Co.Ltd. 

出 版 物:《Baosteel Technical Research》 (宝钢技术研究(英文版))

年 卷 期:2015年第9卷第2期

页      面:55-60页

学科分类:080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主  题:double-walled copper-brazed marking problem trimmed edge 

摘      要:This study explores the reasons underlying the frequent appearance of "marking problem" during the production of double-walled copper-brazed steel tubes. To this end, we compared two types of copper-coated steel strips, of which one has almost no problem during production, whereas the other has higher number of incidences of "marking problem". We analyzed the chemical composition,mechanical properties,the cross-sectional metallographs, and surface quality of the trimmed edge in both types of specimen. After the roll forming process, the bonding condition between the steel layers of the tubes before and after brazing process has also been examined. Results indicate that the chemical composition and mechanical properties of the two kinds of strips are similar; however, the edge quality of the trimmed strips is significantly different. It is believed that the irregular shape of the edge portions in the strips will be more pronounced during the bevel treatment. Consequently, smooth and tight seams cannot be guaranteed by such uneven beveled edges,which lead to higher number of incidences of "marking problem" during production.

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