A4 Conference proceedings

Fatigue Performance of GMA-Brazed Non-load Carrying Joints Made of Ultra-High-Strength Steel


Open Access publication

Publication Details
Authors: Ahola Antti, Skriko Tuomas, Björk Timo
Publication year: 2018
Language: English
Title of parent publication: Vehicle and Automotive Engineering 2 - Proceedings of the 2nd VAE2018
Start page: 157
End page: 169
Number of pages: 13
ISBN: 978-3-319-75676-9
eISBN: 978-3-319-75677-6
JUFO-Level of this publication: 1
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2018051824205

Abstract

With the aim of maximizing energy efficiency, the use of low-alloyed
ultra-high strength steels (UHSS) has greatly increased in vehicles and
other transport applications in recent decades. Using UHSS, equivalent
ultimate load capacity can be achieved with less material than when
using conventional structural steels. Along with increased static load,
structures commonly made of UHSS are often subjected to high cyclic
load, and good fatigue strength is thus demanded. In this study, the
fatigue strength was obtained for gas metal arc (GMA)-brazed non-load
carrying joints made of S960 MC plates. CuMn13Al7 and CuAl8 were used as
braze alloys. In addition, the work evaluated the potential of gas
metal arc brazing (GMAB) as a post-weld improvement technique. A total
of 21 different test specimens were manufactured and tested with
constant amplitude fatigue tests with an applied stress ratio of R = 0.1.
Notch effects of the braze joints were investigated numerically using
finite element analysis (FEA). Depending on the braze alloy and joint
configuration, mean nominal fatigue strengths of FATmean = 134–192 MPa
were obtained, indicating that GMAB is a promising joining method for
structures made of UHSS. The FEA results showed that for the studied
materials and joints, stress concentration induced in the joint can
decrease approximately by 20% when GMAB is applied instead of fusion
welding


Last updated on 2019-11-10 at 13:40