Dynamics of the vapour flow in the keyhole in penetration welding with a laser at medium welding speeds

摘要: The keyhole formed when a laser is used as the power source for weld between two pieces of metal contains partially ionized vapour well other material. This flow linked with fluid motion and thermal conduction taking place in liquid solid regions surrounding it. A simple model presented which describes parallel to axis welding speed medium range. It shown that shock waves may be present at its ends. formulation time dependent. Investigation blind keyholes shows there no solutions consistent assumptions model, but are, exist both without shocks entrance. character can vary considerably. As increases process becomes successively more dominated by direct absorption walls.