Abstract
The effect of laser shock peening (LSP) process on the mechanical characteristics of aluminum and titanium welding joints was investigated. Since LSP requires special ablative and transparent coatings, efficiency of different coatings was analyzed. It was shown that highest LSP effect was obtained by using aluminum foil attached with adhesive tape as an ablative layer and water as a transparent overlay. Several laser peening conditions with different intensities, durations, and number of shots were tested to determine the applicability of the method for an aluminum and titanium alloys. Surface microhardness of observed materials was increased up to 70 %. It was shown LSP of welded joints of Al-6Mg aluminum alloy allows to change tensile residual stresses in the weld zone, on compressive stresses.
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