211 Nd: YAG laser lap fillet welding of thin sheet AZ31 magnesium alloy using silver NanoPaste^[○!R]

概要

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In this paper, the use of the Ag NanoPaste^[○!R] as an insert material has been proposed to laser-weld AZ31B magnesium alloy with a thickness of 0.3 mm. Lap fillet welding of the sheet coated with the Ag NanoPaste^[○!R] was carried out by using a pulsed Nd: YAG laser in argon atmosphere. Characteristics of the weld and mechanical properties of the joint were examined. Weldability of the thin sheet AZ31B was successfully improved with the Ag NanoPaste^[○!R] under the optimized conditions of pulse energy 1.8 J, pulse duration 3.0 ms, repetition rate 80 Hz, and scan speeds between 450 to 600 mm/min. Other advantages are the increase of bond width, the reduction of weld defects, and the expansion of the range of process parameters, compared with insert-free welding. Weld joint efficiency improves up to 92% of the base metal, while that without the Ag NanoPaste^[○!R] was 84%.
一般社団法人日本機械学会の論文
2009-08-25