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- W135301843 abstract "Acoustic emission (AE) response during welding was examined as a possible nondestructive tool to evaluate weld quality. Welding was performed with varying current, gas atmosphere, stem restraint, and surface oxide thickness. The welds were examined for peel strength, fracture surface appearance, and metallurgical bond quality. Acoustic emission monitoring and analysis was performed by the Physical Acoustics Corporation (PAC). Results show that the AE welding function (AEWF) as defined by PAC is a good measure of bond strength for normal stems welded in a hydrogen atmosphere. The AEWF increases as the weld strength and bond quality increase. The AE analysis gave significant information regarding welding mechanisms. Plastic deformation, associated with a low AEWF, occurs at low currents and at the beginning of the weld period. At higher currents, recrystallization and grain growth occur across the bond interface, resulting in good strength and medium AEWF values. For fully restrained stems, melting and solidification processes are observed to greatly increase the bond strength and AE response." @default.
- W135301843 created "2016-06-24" @default.
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- W135301843 date "1987-05-01" @default.
- W135301843 modified "2023-09-26" @default.
- W135301843 title "Acoustic emission monitoring of pinch welds" @default.
- W135301843 hasPublicationYear "1987" @default.
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