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• W2897427229 abstract "Pulsed YAG laser spot welding has been noted as high-quality and good-flexibility joining technology. However, porosity is likely to form in a deeply penetrated spot weld. In this study, therefore, the keyhole behavior and porosity formation situation during YAG laser spot welding of Type 304 and A5083 were observed by the microfocused X-ray transmission method. It was consequently measured that the drilling and collapse speeds of the keyhole in Type 304 molten pool were about 0.5 m/s and 1 m/s, respectively, under the laser irradiation of a rectangular pulse shape. Namely, the collapse of the keyhole was so rapid as to form a bubble and porosity. It was also confirmed that the porosity was formed from the middle or bottom part of a deep and narrow keyhole as a result of its abrupt collapse. Moreover, spot welding was tried under the conditions of proper pulse shapes devised for the porosity reduction. Consequently the optimum saw-teeth-like pulse shape with tailing power was revealed for the prevention of porosity, and the mechanism of porosity formation and prevention was proved by the X-ray transmission observation method.Pulsed YAG laser spot welding has been noted as high-quality and good-flexibility joining technology. However, porosity is likely to form in a deeply penetrated spot weld. In this study, therefore, the keyhole behavior and porosity formation situation during YAG laser spot welding of Type 304 and A5083 were observed by the microfocused X-ray transmission method. It was consequently measured that the drilling and collapse speeds of the keyhole in Type 304 molten pool were about 0.5 m/s and 1 m/s, respectively, under the laser irradiation of a rectangular pulse shape. Namely, the collapse of the keyhole was so rapid as to form a bubble and porosity. It was also confirmed that the porosity was formed from the middle or bottom part of a deep and narrow keyhole as a result of its abrupt collapse. Moreover, spot welding was tried under the conditions of proper pulse shapes devised for the porosity reduction. Consequently the optimum saw-teeth-like pulse shape with tailing power was revealed for the prevention o..." @default.
• W2897427229 created "2018-10-26" @default.
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• W2897427229 date "2001-01-01" @default.
• W2897427229 modified "2023-10-05" @default.
• W2897427229 title "X-ray transmission in-situ observation of keyhole during laser spot welding and pulse-shaping for prevention of porosity" @default.
• W2897427229 doi "https://doi.org/10.2351/1.5059758" @default.
• W2897427229 hasPublicationYear "2001" @default.
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