Get Arc welding control (Series in Welding and Other Joining PDF

By Pan Jiluan

Written by means of a pioneer within the box, this booklet covers all facets of the rising expertise of arc welding. Part one quantitatively describes the dynamic habit of arc welding, the facility resources used, and their influence on welding expertise throughout the foundation of keep an eye on theory. The moment part describes new methods of controlling the welding arc via glossy electronics. the subsequent sections establish the 1st mathematical version of the arc sensor at the foundation of keep watch over idea and introduce a brand new technique 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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30] Assuming that the power source has a constant-current characteristic and neglecting the influence of wire extension on melting rate, the control-block diagram of the regulated wire-feed rate system may be simplified as shown in Fig. 5. In Fig. 5, Rvf (s) represents the control input to the wire-feed motor and k2 is the open-loop gain of the motor circuit. According to Fig. 35] In most instances, k2KmpkaTm > 1 and 0 < z < 1; therefore the system is in an underdamped state. In the following sections, the effects of the major parameters on the control characteristics are discussed.

49] + (Ts + 1)(Tc s + 1)(Tb s + 1)R (R1 + R2 ) R3 From this equation, it is seen that the power source is a third-order system with two zeros. In order to simplify the equation, some minor factors can be neglected. 20 Schematic diagram of amplitude-frequency characteristics for a transistorised power source with a flat power-source characteristic From the simplified equation, it can be seen that the power source is equivalent to a first-order system with one zero; the amplification coefficient is -bK/(bR + R1 + R2), the value of zero is s0 = -bKR3/[(R1 + R2)(Tc + Tb)] and the value of the pole is sp = -(bR + R1 + R2)/[(R1 + R2)Tb + bKRT].

The reason for this statement is that when R < k < R + kp, the increase of arc length makes the gain of negative feedback smaller. In other words it is, in fact, a positive feedback loop. As the self-regulation action maintains negative feedback, the system then can be kept stable if the self-regulation action is stronger than the wire-feed regulation. 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.

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

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