In the friction stir welding (FSW) process, heat is generated by friction between the tool and the workpiece. This heat flows into the workpiece as well as the tool. The amount of heat conducted into the workpiece determines the quality of the weld, residual stress and distortion of the workpiece. The amount of the heat that flows to the tool dictates the life of the tool and the capability of the tool for the joining process. In this paper, we formulate the heat transfer of the FSW process into two boundary value problems (BVP)—a steady state BVP for the tool and a transient BVP for the workpiece. To quantify the physical values of the process the temperatures in the workpiece and the tool are measured during FSW. Using the measured transient temperature fields finite element numerical analyses were performed to determine the heat flux generated from the friction to the workpiece and the tool. Detailed temperature distributions in the workpiece and the tool are presented. Discussions relative to the FSW process are then given. In particular, the results show that (1) the majority of the heat generated from the friction, i.e., about 95%, is transferred into the workpiece and only 5% flows into the tool and (2) the fraction of the rate of plastic work dissipated as heat is about 80%.

Issue Section:
Technical Papers
Keywords:
welding, heat transfer, friction, machine tools, machining, joining processes, temperature distribution, manufacturing processes
Topics:
Friction, Heat, Heat transfer, Temperature, Welding, Temperature distribution, Heat flux, Joining, Finite element analysis, Steady state, Transients (Dynamics), Boundary-value problems
1.
Tang
,
W.
,
Guo
,
X.
,
McClure
,
J. C.
,
Murr
,
L. E.
,
Nunes
,
A.
,
1988
, “
Heat Input and Temperature Distribution in Friction Stir Welding
,”
Journal of Materials Processing and Manufacturing Science
,
7
(
2
), pp.
163
–
172
.
2.
Colegrove, P., Painter, M., Graham, D., and Miller, T., 2000, “3 Dimensional Flow and Thermal Modeling of the Friction Stir Welding Process,” Proceedings of the Second International Symposium on Friction Stir Welding, June 26–28, Gothenburg, Sweden.
3.
McClure, J. C., Tang, T., Murr, L. E., Guo, X., and Feng, Z., 1998, “A Thermal Model of Friction Stir Welding,” Trends in Welding Research, J. M. Vitek, et al., eds., Proceedings of the 5th International Conference, Pine Mountain, GA, June 1–5, pp. 590–595.
4.
Gould
,
J.
, and
Feng
,
Z.
,
1998
, “
Heat Flow Model for Friction Stir Welding of Aluminum Alloys
,”
Journal of Materials Processing & Manufacturing Science
,
7
(
2
), pp.
185
–
194
.
5.
Chao
,
Y. J.
, and
Qi
,
X.
,
1998
, “
Thermal and Thermo-Mechanical Modeling of Friction Stir Welding of Aluminum Alloy 6061-T6
,”
Journal of Materials Processing & Manufacturing Science
,
7
, pp.
215
–
233
.
6.
Chao, Y. J., and Qi, X., 1999, “Heat Transfer and Thermo-Mechanical Analysis of Friction Stir Joining of AA6061-T6 Plates,” Proceedings of the First International Symposium on Friction Stir Welding, June 14–16, Rockwell Science Center, Thousand Oaks, California.
7.
Russel, M. J., and Shercliff, H. R., 1999, “Analytical Modeling of Microstructure Development in Friction Stir Welding,” Proceedings of the First International Symposium on Friction Stir Welding, June 14–16, Rockwell Science Center, Thousand Oaks, California.
8.
Frigaard, O., Grong, O., Bjorneklett, B., and Midling, O. T., 1999, “Modeling of the Thermal and Microstructure Fields During Friction Stir Welding of Aluminum Alloys,” Proceedings of the First International Symposium on Friction Stir Welding, June 14–16, Rockwell Science Center, Thousand Oaks, California.
9.
Song
,
M.
, and
Kovacevic
,
R.
,
2002
, “
A New Heat Transfer Model for Friction Stir Welding
,”
Transactions of North America Manufacturing and Research Institute, Society of Manufacturing Engineering
, Vol.
XXX
, pp.
565
–
572
.
10.
Chao, Y. J., Qi, X., and Tang, W., 2000, “Heat Transfer Analysis of Friction Stir Joining of AA2195 Plates,” AeroMat 2000, 11th Advanced Aerospace Materials and Processes Conference, 26–29 June.
11.
Metals Handbook, 1990, 10th edition, ASM International Handbook, p. 775.
12.
Chao
,
Y. J.
, and
Qi
,
X.
,
1999
, “
Three-dimensional Modeling of Gas Metal Arc Welding Process
,”
Transaction of North America Manufacturing and Research Institute, Society of Manufacturing Engineering
, Vol.
XXVII
, pp.
117
–
122
.
13.
Chao, Y. J., Zhu, X., and Qi, X., 2000, “WELDSIM-A WELDing SIMulation Code for the Determination of Transient and Residual Temperature, Stress, and Distortion,” Advances in Computational Engineering and Science, Vol. II, Atluri, S. N., and Brust, F. W., eds., pp. 1207–1211.
14.
Dike, J., Cadden, C., Corderman, R., Schultz, C., and McAninch, M., 1995, “Finite Element Modeling of Multipass GMA Welds in Steel Plates,” Proceedings of the 4th International Conference of Trends in Welding Research, Gatlinburg, TN, June 4–8.
15.
Macdougal
,
D.
,
2000
, “
Determination of the Plastic Work Converted to Heat Using Radiometry
,”
Exp. Mech.
,
40
(
3
), pp.
289
–
297
.
16.
Rosakis
,
P.
,
Rosakis
,
A. J.
,
Ravicahandran
,
G.
, and
Hodowany
,
J.
,
1999
, “
A Thermodynamic Internal Variable Model for the Partition of Plastic Work into Heat and Stored Energy in Metals
,”
J. Mech. Phys. Solids
,
48
, pp.
581
–
607
.
17.
Hodowany
,
J.
,
Ravicahandran
,
G.
,
Rosakis
,
A. J.
, and
Rosakis
,
P.
,
2000
, “
Partition of Plastic Work into Heat and Stored Energy in Metals
,”
Exp. Mech.
,
40
(
2
), pp.
113
–
123
.
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