Transactions of Materials and Heat Treatment

Title：Development and application on integrated laser tailor welding hot forming for door ring

Authors： Chen Jiayue Qi Xuejun Liu Yong Cao Weilin Xu Mengqi

Unit： VOYAH Automobile Technology Company Ltd.

KeyWords： hot forming door ring laser tailor welding 25% bias collision moving deformable barrier

ClassificationCode：U466; TG456.7

year,vol(issue):pagenumber：2023,48(2):77-84

Abstract：

A door ring by integrated hot forming after laser tailor welding was designed and developed with five thicknesses of sheets and two patch sheets, and the used hot forming steel sheets had three strengths of 1000, 1500 and 2000 MPa, considering collision deformation and energy absorption. Then, the numerical simulations of 25% bias collision and moving deformable barrier (MDB) collision were carried out for the traditional stamping-welded door ring and integrated laser tailor welding (LTW) hot forming door ring, respectively. The results show that at 25% bias collision, the maximum local deformation intrusion amount of the traditional door ring is more than 190 mm, and the maximum deformation intrusion amount of the integrated door ring is 166.313 mm, which is a reduction of 14.4%, and the local deformation intrusion amount of the integrated door ring is less than that of the traditional door ring. At moving deformable barrier (MDB) collision, the local deformation intrusion amount of the integrated door ring is slightly less than that of the traditional door ring. The mechanics performance of each component in the integrated hot forming door ring after laser tailor welding meets the design requirements, among them, the strength of B-pillar patch sheet reaches 1878 MPa, and the strength of threshold reinforcing sheet reaches 1041 MPa with good toughness. The strength of five weld seams of laser tailor welding is greater than that of the base material on the weaker side. Compared with the traditional door ring, the whole vehicle weight of the integrated door ring is reduced by 10.146 kg, and the weight reduction rate is 20.6%. The material utilization rate increases from 66.7% to 71.19%, the cost of a single vehicle increases by 80 yuan per vehicle, but the lightweight cost increases by only 7.88 yuan, which is 1/3 to 1/2 of the industry level.

Funds：

湖北省重大科技专项（2022AAA001）

作者简介：陈嘉玥（1991-），男，学士，高级工程师，E-mail：chenjiayue@voyah.com.cn；通信作者：祁学军（1978-），男，硕士，工程师，E-mail：qixuejun@voyah.com.cn

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