Read e-book online Arc welding control (Series in Welding and Other Joining PDF

By Pan Jiluan

Written by means of a pioneer within the box, this e-book covers all facets of the rising know-how of arc welding. Part one quantitatively describes the dynamic habit of arc welding, the ability assets used, and their impression on welding know-how in the course of the foundation of regulate theory. The moment part describes new methods of controlling the welding arc via glossy electronics. the following sections establish the 1st mathematical version of the arc sensor at the foundation of keep an eye on concept and introduce a brand new strategy for measuring weldment temperature fields utilizing the colorimetric-imaging procedure. The 5th and final section explains the assumption of spotting weld grooves with a three-d imaginative and prescient procedure and automated programming of the weld direction.

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Additional resources for Arc welding control (Series in Welding and Other Joining Technologies)

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23, in which 200 15 A/150 W power transistors are connected in parallel as the load. 2 Measuring method To study the characteristics in frequency domain, in fact, is to measure the amplitude-frequency characteristics and the phase–frequency characteristics. The measuring method is as follows. (i) Set the load current and voltage of the power source at a stable point. (ii) Vary the voltage across the controllable load according to a sine wave at a certain frequency. Both the voltage and current across the load are measured.

I) In the case M = 0, there is a very small mutual inductance and Eq. 29] The transfer function becomes a Type 1 control system, the external excitation winding has no effect on the dynamic characteristics of the power source, and the time constant depends only on the parameters of the major circuit. The dynamic-response speed can be increased by decreasing the value of L/(R + Kc). Letting wn = (R + Kc)/L, then the amplitude-frequency characteristics can be depicted as shown in Fig. 16. (ii) In the case M = LL1, the mutual inductance of the generator has the maximum value.

11]. 11 Amplitude-frequency characteristics of power source (C) (Asymptote) The amplification coefficient is still -1/R. Let w1 = 1/RC, w 2 = 1 LC , then its amplitude-frequency characteristics can be depicted as shown in Fig. 11. From the figure, it can be seen that the characteristic curve takes a different form if w1 and w2 are assumed to have different values. 12 Equivalent electric circuit of power source (D) (iv) If the power source has a configuration as shown in Fig. 12, then its impedance and transfer function can be expressed as Eq.

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Arc welding control (Series in Welding and Other Joining Technologies) by Pan Jiluan

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