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- Title
INCREASE OF FATIGUE RESISTANCE OF SHEET WELDED JOINTS OF ALUMINUM ALLOYS USING HIGH-FREQUENCY PEENING.
- Authors
KNYSH, V. V.; KLOCHKOV, I. N.; PASHULYA, M. P.; MOTRUNICH, S. I.
- Abstract
A work is dedicated to experimental investigation of dependencies of fatigue resistance of sheet (δ = 2-3 mm) welded joints of average and high strength aluminum alloys, which were produced using consumable-electrode pulsed-arc welding in inert gases (PMIG) as well as determination of efficiency of rise of their fatigue life through application of high-frequency mechanical peening (HFMP) by set parameters of strengthening. Efficient parameters of HFMP strengthening of sheet welded joints with the help of portable manual equipment USP-300 were determined based on measurement of microhardness, local geometry parameters of weld and angular residual lipping distortion. Influence of HFMP of zone of weld to base metal transition on measurement of stress concentration factor, welding residual stresses and structure of surface layer of butt joints of small thickness aluminum alloys was investigated. It is shown that increase of radius of weld to base metal transition and elimination of angular residual lipping distortion after HFMP treatment provides for 1.35-1.49 reduction of stress concentration factor in the joints. It is determined that life on the basis of testing 2·106cycles of stress alternation for strengthened butt joints from D16T alloy shows 5 times rise, that for AMg6 alloy makes 4 times and 7 times for 6061-T6 alloy in comparison with initial as-welded condition. The recommendations are given on efficient HFMP strengthening of sheet welded joints for increase of their fatigue life and elimination of residual welding deformations.
- Subjects
ALUMINUM alloy metallurgy; WELDED joint fatigue; WELDED joint testing; METAL fatigue; STRENGTH of materials
- Publication
Paton Welding Journal, 2014, Issue 5, p21
- ISSN
0957-798X
- Publication type
Article
- DOI
10.15407/tpwj2014.05.04