Residual stress measurement on propellant tank of 2219 aluminum alloy and study on its weak spot

This paper presented residual stress measurement on two circumferential Variable polarity plasma arc welding (VPPAW) joints and one circular closed Friction stir welding (FSW) joint on the propellant tank of 2219 aluminum alloy using the indentation strain-gauge method. Quite large tensile residual...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2017, 31(5), , pp.2213-2220
Main Authors: Huang, Chaoqun, Li, Huan, Li, Jianxiong, Luo, Chuanguang, Ni, Yanbing
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Circularity
Circumferences
Compressive properties
Control
Dynamical Systems
Engineering
Friction stir welding
Indentation
Industrial and Production Engineering
Mechanical Engineering
Plasma arc welding
Polarity
Position measurement
Propellant tanks
Residual stress
Strain gauges
Stress measurement
Vibration
Welded joints
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Summary:This paper presented residual stress measurement on two circumferential Variable polarity plasma arc welding (VPPAW) joints and one circular closed Friction stir welding (FSW) joint on the propellant tank of 2219 aluminum alloy using the indentation strain-gauge method. Quite large tensile residual stresses were attached to the center and inner areas of the circular closed FSW joint. There were very large tensile stresses in some points of the two circumferential VPPAW joints, among these points, the maximum value was +253 MPa, which was about 63 % of the yield strength of 410 MPa measured in the base material. In addition, the peak of compressive residual stress was about -160 MPa. Above all, there were two typical peaks of residual stress in the circumferential VPPAW joints, one was located in the middle part while the other one was near the start/end position of the joints. Combining the result of residual stress measurement with the characteristics of the tank structure, it can be concluded that circular closed FSW joint around the flange was a weak spot on the propellant tank. And the most vulnerable point on the circular closed FSW joint has also been found.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-017-0417-5