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New PDF release: Arc welding control (Series in Welding and Other Joining

By Pan Jiluan

Written through a pioneer within the box, this publication covers all facets of the rising know-how of arc welding. Part one quantitatively describes the dynamic habit of arc welding, the ability resources used, and their impression on welding know-how during the foundation of keep watch over theory. The moment part describes new methods of controlling the welding arc via smooth electronics. the following sections establish the 1st mathematical version of the arc sensor at the foundation of keep watch over idea and introduce a brand new approach for measuring weldment temperature fields utilizing the colorimetric-imaging procedure. The 5th and final section explains the belief 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)

Example text

B. 2. 1 Criteria of dynamic characteristics for rectifier-type welding power sources[9] No. 25 215 4 300 5 400 6 600 where Ifd is defined as indicated in Fig. 3. From the introduction given above, it is seen that, until now, the descriptions and measuring methods for the dynamic characteristics of power sources have been simple and not rigorous. 4 Schematic drawing of current waveform consisting of a resistance and an electro-magnetic switch. If is the load current. It obviously is not exact. 4 shows the current wave-form for two different power sources.

E. w1 < w2. Therefore, the amplitude-frequency characteristics can be depicted as shown in Fig. 15. In the following paragraphs, the transfer function of the welding generator under two special conditions is discussed. (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.

Some of the results are shown in Fig. 25. From these results, it can be seen that power sources having different configurations have different amplitude-frequency and phase-frequency characteristics. Some of them are minimum-phase systems. For example, an analogue-type transistorised power source with rising output characteristics has an unstable element in its transfer function. The amplitude- and phase-frequency characteristics in the low-frequency range represent the static characteristics of the system; those in the medium- and high-frequency ranges represent the dynamic characteristics of the system.

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


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