By Pan Jiluan
Written by means of a pioneer within the box, this e-book covers all features of the rising know-how of arc welding. Part one quantitatively describes the dynamic habit of arc welding, the facility resources used, and their impression on welding know-how in the course of the foundation of keep an eye on theory. The moment part describes new methods of controlling the welding arc via smooth electronics. the subsequent sections establish the 1st mathematical version of the arc sensor at the foundation of keep an eye on conception 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 method and automated programming of the weld course.
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Extra info for Arc welding control (Series in Welding and Other Joining Technologies)
40] From the above analysis, it can be seen that the change of the output characteristic of the power source not only changes the dynamic characteristics of the self-regulated system but also changes the dynamic characteristics of the wire-feed regulated system; it can change even the polarity of the feedback loop. In the following text, the interaction of two regulation systems is analysed assuming the system is stable. If k < R, both regulation systems provide negative feedback. According to Eq.
Additional increase of Tm makes wn, wd and s smaller and the transient time longer, and thus worsens the dynamic characteristics. Decreasing the value of Tm improves the dynamic characteristics of the system, or increases the control accuracy by increasing the open-loop gain while the dynamic characteristics remain unchanged. According to Eq. 29], in order to decrease time constant, Tm, a motor having a small time constant, or rational design of the mechanical parts are effective. Decreasing the moment of inertia, J, and increasing the viscosity coefficient, f, also can decrease Tm.
Of course, it is possible also to use a random signal and detect its response. 24 Block diagram of the measuring method special signal-processing apparatus should be used to find the amplitudefrequency and phase-frequency characteristics. 3 Experimental results and analysis Different types of power sources have been tested and characterised by the author and his colleague using the method described in the previous section. 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.
Arc welding control (Series in Welding and Other Joining Technologies) by Pan Jiluan