Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 836-841.doi: 10.13229/j.cnki.jdxbgxb20180202

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Temperature fields in bobbin⁃tool friction stir welding for 6082⁃T6 aluminum alloy sheet

Yu⁃peng LI1,2,3(),Da⁃qian SUN1,2,Wen⁃biao GONG3   

  1. 1. School of Materials Science and Engineering, Jilin University, Changchun 130022, China
    2. Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130022, China
    3. School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, China
  • Received:2018-03-07 Online:2019-05-01 Published:2019-07-12

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Abstract:

In this paper, the thermal cycle curves of different processes of 4 mm 6082?T6 aluminum alloy bobbin?tool friction stir welding were detected using thermocouples measurement technology. Then the distribution characteristics of temperature field in the test area were analyzed. The results show that the maximum temperature of each measuring points at the retreating side of the welding is always higher than the advancing side, and the maximum temperature difference is about 20 ℃. When the HAZ temperature exceeds 250 ℃, the β'' begins to dissolve and the hardness begins to decrease. When the welding speed is constant, the heat input increases first and then decreases with the increase in the spindle speed. At 1000 r/min, the measuring point reaches the maximum temperature value, and then decreases at 1200 r/min. When the spindle speed is constant and the welding speed increases, the heat input of unit time decreases，and the difference of peak temperature increases between the advancing side and retreating side, the width of 250 ℃ isotherm is reduced considerably.

Key words: metallic materials, 6082?T6 aluminum alloy, bobbin?tool friction stir welding, temperature field, thermal cycling curve

CLC Number: 

  • TG456.9

Fig.1

Schematic diagram of distribution of temperature measurement points"

Fig.2

Schematic diagram of thermocouple installation"

Fig.3

Heat cycle curves of measuring points with800 r/min and 500 mm/min"

Fig.4

Peak temperature comparison diagram ofAS and RS by 800r/min and 500 mm/min"

Fig.5

TEM micrograph of BM and HAZ"

Fig.6

Temperature distribution and microhardness of welding joint by 800r/min and 500 mm/min"

Fig.7

Peak temperature comparison of each points by different spindle speed"

Fig.8

Temperature distribution of welding joint by different spindle speed"

Fig.9

Temperature distribution of welding joint by different welding speed"

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