Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (8): 2212-2218.doi: 10.13229/j.cnki.jdxbgxb.20211086

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Welding deformation and compensation method of B-pillar in body-in-white

Xiao ZHOU(),Yi-jie LIANG(),Zhong-xuan XI,Yu-tao WANG   

  1. Vor Serien Center，FAW-Volkswagen Automotive Co. ，Ltd. ，Changchun 130011，China
  • Received:2021-10-22 Online:2023-08-01 Published:2023-08-21
  • Contact: Yi-jie LIANG E-mail:xiao.zhou@faw-vw.com;yijie.liang@faw-vw.com

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Abstract:

In order to solve the matching and functional problems caused by the welding deformation of B-pillar in BIW （Body-In-White）， the whole welding process of B-pillar area is simulated based on the finite element （FEM） method， and the welding deformation of B-pillar is predicted， also the prediction accuracy is evaluated by means of test and measurement. The results show that the B-pillar welding deformation simulation based on FEM method has good prediction accuracy. Two welding pre-deformation control methods are proposed， one is compensated pre-bending with constant cross section， and the other is pre-bending with changed cross section. The pre-deformation is calculated by multi-objective optimization model. The two pre-deformation control methods are verified by FEM simulation. The results show that， both the two pre-deformation control methods can achieve the body size's tolerance meeting the design requirements， and the control accuracy of pre-bending with changed cross section is better than the method of compensated pre-bending with constant cross section.

Key words: welding process and equipment, welding deformation, B-pillar of body-in-white, pre-deformation control, multi-objective optimization

CLC Number: 

  • TG404

Fig.1

Material parameters of hot formed steel"

Table 1

Welding procedure parameters"

工序加工区域

焊接电流

I/A

预压力

F/N

加压时间

t/s

AB柱内板930040001000
B侧围内板83003500800
C主焊骨架83003500800

Fig.2

Schematic of welding points position"

Fig.3

Grid division of B-pillar"

Fig.4

Schematic of welding clamping position"

Fig.5

Prediction of welding deformation based on FEM"

Fig.6

Verification of welding deformation in y-direction by trial and measurement"

Fig.7

Schematic of pre-deformation compensation of B-pillar"

Fig.8

Schematic of pre-bending with constant cross section"

Fig.9

Section selection of pre-bending with constant section"

Table 2

Optimization target of pre-bending with constant section"

序号符号目标名称约束条件/mm
1δF前部法兰边y向尺寸一致性0.5
2δR后部法兰边y向尺寸一致性0.5
3δxi单截面前后法兰边尺寸一致性±0.3
4δs铰链面位置y向厚度尺寸±0.3

Table 3

Deformation data of B-pillar"

前部法兰边 变形量/mm后部法兰边 变形量/mm中间铰链面 变形量/mm
YF1=1.30YR1=1.83YS=0.58
YF2=1.10YR2∶1.75
YF3∶1.15YR3∶1.61
YF4∶0.77YR4∶0.86
YF5=0.32YR5=0.47

Table 4

Pre-bending dimension with constant section"

截面符号预弯量/mm
1dy11.54
2dy21.42
3dy31.12
4dy40.84
5dy50.40

Fig.10

Schematic of pre-bending with changed cross section"

Fig.11

Schematic of section selection of pre-bending with changed section"

Table 5

Pre-bending dimension with changed section"

截面符号预弯量/mm
1dy11.62
2dy21.49
3dy31.35
4dy40.82
5dy50.40
6dys0.58

Fig. 12

Effectiveness and accuracy verification of pre-deformation control method"

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