TPWJ, 2014, #4, 17-21 pages
MODELING OF WELD POOL BEHAVIOUR IN SPOT WELDING BY PULSED LASER RADIATION
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue № 4, 2014 (April)
A.P. SEMYONOV, I.V. SHUBA, I.V. KRIVTSUN and V.F. DEMCHENKO
E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: email@example.com
Process of metal evaporation in laser welding is accompanied by dynamic impact of metal vapours on pool free surface. As this process proceeds non-uniformly over pool surface, reactive vapour pressure can differ considerably in its different sections, leading to depression of melt free surface. This work proposes a mathematical model allowing investigation of penetration dynamics and shape of weld pool free surface in laser welding of sheet metals by a stationary pulsed source (spot welding). When developing the model, we assumed that heat transfer process in the metal is due to heat conductivity and convection, and heat losses from the surface are due to metal evaporation and energy loss for heat radiation. The work gives the results of numerical modeling of weld pool penetration dynamics derived with application of the developed model. 6 Ref., 7 Figures.
laser spot welding, sheet material, mathematical model, penetration dynamics, weld pool shape
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