| 摘要 |
PURPOSE:To set automatically optimum welding conditions even if a work condition and an environment are varied by calculating a weldability index from welding current and welding voltage waveform data, and controlling an output of an welding power source or a wire feed quantity so that the exponential value becomes minimum. CONSTITUTION:As current I0 and voltage waveform data in case of CO2 or MAG welding, an index W for grasping quantitatively the weldability from a short-circuit time TS, an arc time Ta, an average value Is.ave of a current of the short circuit period, an average value Ia.ave of a current of the arc period, etc. is calculated, and by its value, an output of a welding power source or a wire feed quantity is controlled. In this regard, the weldability index W can be derived from an expression I which has used the short circuit time, the arc time, sigmaTS, sigmaTa, sigmaIs-ave and sigmaIa-ave being standard deviations of an average value of the current of the short circuit period and an average value of the current of the arc period, a constant K being the product of those values in a reference welding condition, an average value Ra.ave of a resistance in the arc period, an electric power Pa in the arc period, Ra.ave in optimum conditions, and a regression expression Ri and Pi. |
