Document Type
Paper
Keywords
Handheld microchip laser peening, Welded aluminum thin plate, Residual stress, Fatigue property
DOI
10.5703/1288284317935
Location
STEW 206
Start Date
24-9-2025 8:50 AM
Abstract
To improve the fatigue properties of welded aluminum alloy thin plates used in transportation machinery, handheld laser peening (HH-LP) was applied to 2 mm-thick A5083-O specimens prepared by bead-on TIG welding. Conventional laser peening often causes warping in thin plates, but the HH-LP treatment using low-energy laser pulses avoids this problem. The HH-LP treatment introduced compressive residual stresses of over 200 MPa on the heat-affected zone (HAZ) of the welded specimens. Fatigue tests under plane bending conditions revealed that the HH-LP treatment significantly improved the fatigue strength of the welded specimens, achieving a level comparable to that of the base material (BM) with effectively eliminating the detrimental effects of the stress concentration at the weld toe.
Included in
Engineering Mechanics Commons, Manufacturing Commons, Mechanics of Materials Commons, Structural Materials Commons
Effects Of Laser Peening On Fatigue Properties Of Welded Aluminum Thin Plates
STEW 206
To improve the fatigue properties of welded aluminum alloy thin plates used in transportation machinery, handheld laser peening (HH-LP) was applied to 2 mm-thick A5083-O specimens prepared by bead-on TIG welding. Conventional laser peening often causes warping in thin plates, but the HH-LP treatment using low-energy laser pulses avoids this problem. The HH-LP treatment introduced compressive residual stresses of over 200 MPa on the heat-affected zone (HAZ) of the welded specimens. Fatigue tests under plane bending conditions revealed that the HH-LP treatment significantly improved the fatigue strength of the welded specimens, achieving a level comparable to that of the base material (BM) with effectively eliminating the detrimental effects of the stress concentration at the weld toe.