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A new method is proposed for determining the frictional index by repeated wire extension. The frictional conditions are investigated with change in the extension, the drawplate taper, and other parameters. A general formula for the frictional characteristics and the drawing stress is proposed. The influence of the lubricant on the friction in deformation of the forgings is shown. Formulas for the...
Research work of wire extension control with Dual freedom PID controller in pulsed MIG welding process of aluminum alloy. In the condition of optimum parameters, the simulations were firstly completed by separately using Routine PID control and Dual freedom PID control, based on designing the wire speed of wire extension step response and gaining identification model. Based on the results of simulation...
Aiming at the problem of wire extension stability in aluminum alloy pulsed MIG welding process, the influence of wire feed speed on wire extension is identified and the mathematic model has been set by the step response experimentation. According to the actuality problem of routine PID control, a self-tuning fuzzy PID system in a dynamic process was designed to improve the adaptability and the control...
According to the stability problem of wire extension in aluminum alloy pulsed MIG welding, a rapid prototyping control platform using the xPC real-time target environment based on the sliding mode control theory was established, and then the real-time control on wire extension in aluminum alloy pulsed MIG welding was carry out with sliding mode controller. The results show that the sliding mode controller...
This paper first analyzes how the welding environment impacts on the welding process and quality, and how alteration of the wire extension can be adapted to the welding conditions. Subsequently, a method is put forward to ensure the arc length remains constant by shortening and lengthening the wire extension. The length of the wire extension is under control of the wire feed rate. The formula for...
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