On sliding mode control of the manual gas metal arc welding process

Design of A Series Resonant Converter GMAW Welding Machine by Using the Harmonic Current Technique for Power Transfer

“…The phase shift between the two legs controls the RMS output voltage of v bri . Fourier series expansion of this voltage is given as [1]:…”

“…Electronics 2019, 8, 205 7 of 17 The phase shift between the two legs controls the RMS output voltage of . Fourier series expansion of this voltage is given as [1]: The power control in this circuit is achieved by changing the switching frequency of the SRC in such a way that it is equal to , , , etc. If the required power is low, the switching frequency Due to the band-pass filter feature of the resonant network, only the resonant frequency component of i pri can pass to the secondary side of the converter, with all other frequency components filtered out by the large impedance.…”

“…Flexibility, high speed, and capability of employing different types and thicknesses of materials make gas metal arc welding (GMAW) one of the most widely used processes in industrial and manufacturing operations. Commercial arc welders can be made in smaller sizes with the same capability by reducing the volume of the passive components such as transformers and filter inductors, and cooling parts such as heatsinks [1][2][3]. This can be achieved by increasing the switching frequency and utilizing soft switching techniques to decrease the losses.…”

Integral Sliding Mode Control for GMAW Systems

“…To explore the main features of the sliding mode, like its insensitivity to matched disturbances and parameter variations, the system trajectories are steered to the predesigned sliding manifold and then maintained on the manifold thereafter by means of high frequency switching control which is well documented in Utkin (1992), Edwards and Spurgeon (1998). There has been several approaches till date, using sliding mode control (SMC) algorithms also, to control the arc welding systems as in Kharaajoo et al (2003), Khatamianfar et al (2008). The robustness property of the conventional sliding mode control with respect to variations of system parameters and external disturbances can only be achieved after the occurrence of sliding mode.…”