Transactions of Materials and Heat Treatment

Title：Influence of area ratio of portholes on welding process and quality during the extrusion of square tube by a porthole die

Authors： Huang Dongnan Sun Yuguo Ma Yu Li Youlai Zuo Zhuangzhuang

Unit： Inner Mongolia University of Technology Tongliao Traffic Engineering Bruean

KeyWords： porthole die extrusion area ratio of portholes welding quality

ClassificationCode：TG379

year,vol(issue):pagenumber：2014,39(11):112-116

Abstract：

During the extrusion of hollow profile by a porthole die, area ratio of portholes is directly related to extrusion load, metal flowing uniformity in metal welding process, position of welding line as well as welding quality. Using FEM simulation and extrusion practice, the influence of area ratio of portholes on welding process and quality of square tube extruded by a porthole die was discussed. The results show that, as the area ratio is 0.46-0.52, the metal flowing is equilibria, and the welding line is more close to the center of the mandrel, so the square tube with flat surface can be extruded. The changing of area ratio of portholes has no significant effect on the final temperature of die orifice which remains within 546-549 ℃. With the increasing of area ratio of portholes, the hydrostatic stress of welding decreases from 363 MPa to 314 MPa, which leads to worse welding quality. Therefore, the area ratio of portholes should be small as soon as possible under the prerequisite condition of extruding square tube with flat surface.

Funds：

国家自然科学基金资助项目（51364027）；教育部重点实验室开放课题基金（KLAMP-1104）；内蒙古自治区高等学校科学研究研究项目（NJZY13105）

黄东男（1979-），男，博士，副教授

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