Characteristics of Material Flow in Friction Stir Spot Welding Tools in Consideration of Cutting Tools

This paper investigates the material flows in A5052/A6061 lap joints when friction stir spot welding tools with cutting edges and rake angles similar to a cutting tool are used. In this study, several kinds of modelling experiment were used to visualize the material flows during the friction stir sp...

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Bibliographic Details
Published inQUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol. 38; no. 3; pp. 125 - 133
Main Author IKUTA, Akihiko
Format Journal Article
LanguageJapanese
English
Published Tokyo JAPAN WELDING SOCIETY 2020
Japan Science and Technology Agency
Subjects
Chip
Chips
Contact angle
Cutting
Cutting edge
Cutting parameters
Cutting tools
Discharge
Edge joints
Friction
Friction stir spot welding
Friction stir welding
Lap joints
Material flow
Rake angle
Sheet material
Shoulder
Spot welding
Stirring
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Summary:This paper investigates the material flows in A5052/A6061 lap joints when friction stir spot welding tools with cutting edges and rake angles similar to a cutting tool are used. In this study, several kinds of modelling experiment were used to visualize the material flows during the friction stir spot welding. The majority of the material flows in A5052/A6061 lap joints was diagonally upward from the lower sheet, whether the rake angle of the probe with the cutting edge similar to a cutting tool was negative or positive. When the tool shoulder failed to contact the upper sheet surface, the stirring ability of the probe alone was to an extent high with a negative rake angle and very low with a rake angle of 0° and with positive rake angles. However, when the tool shoulder came into contact with the upper sheet surface and the chips generated by the probe were clogged, the stirring abilities of the tool with a rake angle of 0° and with positive rake angles were very high. In addition, in the tool with a rake angle of 0° and with positive rake angles where the discharge of chips was smooth, the lower sheet material moved upward as the chips were stirred and produced new material flows. From these results, when these tools are used, it is suggested that the generation, the discharge and the stirring of chips affect the material flow upwards, which is crucial, and also downwards, in A5052/A6061 friction stir spot lap joints.
ISSN:0288-4771
2434-8252
DOI:10.2207/qjjws.38.125