Transactions of Materials and Heat Treatment

Title：Integral forming technology of thin-walled multiply stainless steel bellows

Authors： Jian Hanming Zhao Tao Bu Xing Wang Yewei Wang Zimin

Unit： Shanghai Spaceflight Precision Machinery Institute

KeyWords： multiply bellows thin-walled stainless steel longitudinal seam welding high precision hydroforming

ClassificationCode：TG394

year,vol(issue):pagenumber：2021,46(4):81-88

Abstract：

Based on the forming process analysis of thin-walled multiply stainless steel bellows used in pressurization and transport system of carrier rockets, the high precision manufacturing of thin-walled multiply bellows was realized by precise coil welding and integral hydroforming. Then, the parameters of longitudinal seam welding for 0.4 mm 1Cr18Ni9Ti stainless steel were found by process experiments. When the welding current was 40 A and the welding speed was about 50 mm·s-1, the welding seam was formed better, and its appearance and internal quality reached the requirements of class I in QJ 1165A-2001. At the same time, the clearance range of mating edges for arc starting point of tube blank was determined during longitudinal seam welding, and when the clearance of mating edges for arc starting point was less than 0.04 mm, the arc was started smoothly. In addition, the process paths and parameters of integral hydroforming for target multiply bellows were determined by the tests. Finally, when the bulging pressure was 15-16 MPa and the forming pressure was 13-15 MPa, the target three-layer bellows was tightly fitted without clearance between layers.

Funds：

简翰鸣（1992-），男，硕士，工程师 E-mail：jianhanming@sina.com

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