Joint Quality Assessment of Ultrasonic Metal Welded Parts by Fracture Surface Evaluation

被引:1
|
作者
Mueller, Florian W. [1 ]
Zhao, Haolin [1 ,2 ]
Schiebahn, Alexander [1 ]
Reisgen, Uwe [1 ]
机构
[1] Rhein Westfal TH Aachen, Welding & Joining Inst, D-52062 Aachen, Germany
[2] Tsinghua Univ, Inst Adv Mfg iAM, Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China
关键词
joint formation; solid state welding; fracture surface analysis; quality feature determination; MICROSTRUCTURE; INTERFACE; STRENGTH;
D O I
10.3390/met14080892
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In ultrasonic metal welding, low specific resistances and large joining surface cross-sections require the use of mechanical testing to quantify the joint quality. In this study, different quality features of ultrasonically welded joints made of pure copper sheet are investigated during the successive phases of joint formation. Two test series with different workpiece geometries are examined. It is shown that mechanical quality features such as shear and peel forces behave differently over the formation of the joint and are not transferable. As an alternative to these, laser scanning microscopy is used to record images of the fracture surface that describe the growth of the joint area during formation. The study finds that shear tensile force growth and joint area growth are non-linear and comparable, with optimized welds achieving joint areas of 30 mm2 out of 64 mm2 and 6 mm2 out of 16 mm2. Although overall quality increases with increasing welding time, the material strength in the joint zone decreases. Depending on the original rolling condition, between 43% and 59% of the original material strength can be identified as the joint strength. The automatic analysis of fracture images is a suitable alternative to mechanical testing for similar joints.
引用
收藏
页数:29
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