Study of Welded Joint Metal Structure under Pulsed Impact on Arc Discharge

This paper shows the results of experiments to study the effect of the auxiliary voltage with frequency fi= 40000Hz on the stability of arc discharge at the limit mode of the welding process with single, coated electrodes. This effective method of connecting rolled and prefabricated elements of metal structures has found widespread use in their installation, manufacture and repair in the construction of various facilities: industrial and civil purposes, thermal and nuclear power facilities for responsible purposes. In this regard, the increase in the quality and technological, strength parameters of welds, the productivity of the manufacturing metal structure process, is largely associated with welding modes and an increase in the stability of arc discharge as an important element of the system: "power source-arc-welding tub-product." Improving the performance of the welding process under consideration is particularly important under mounting conditions in conjunction with its stability is an important task on the agenda. When performing the study, the following criteria and their values regarding the stability of the welding arc were taken into account, such as: lexpl - rupture length in mm, coefficients of variation: KV(Iwd) - welding current, KV(Uwd) - voltage, qt - constant time, as well as their numerical values were obtained. The obtained numerical values of the above criteria were obtained based on the analysis of graphs (oscillograms) of the dependence of the electric current (Iwd, A) and the voltage (Uwd, V) of the arc on the time of the process duration (t, sec). The obtained results of the analysis indicate an increase in stability, a decrease in inertia of the deviation of the resistance (conductivity) of the welding arc when the auxiliary voltage is applied with a frequency of fi = 40000Hz at the limit mode of welding with coated electrodes.

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Arc stability study at the limit mode of welding with coated electrodes

Burdakov

Tsuverkalova

Zayarov

et al. 2023

GNS

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Justification of obtaining fine-grained structure of welded joints at high-intensity impulse effect on welding circuit

Burdakov,

Ratushny,

Zayarov

2023

GNS

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An effective method of improving the reliability of operation of thermal and nuclear power facilities is to improve the quality of manufacture, installation and repair of their thermal and generating power equipment. One of the ways to improve the quality, technological and service properties of welded joints in the process of their implementation is to influence the structure of the crystallizing metal by thermal, electric high-intensity impulse effect for its grinding. This work proposes the results of an experimental study to substantiate the production of a fine-grained structure of welded joints obtained using manual arc welding with coated electrodes at a high-intensity impulse effect (QPS) with a fi.g.= 40×103 Gts frequency, voltage Ui.g.= 80.0 V, on the welding circuit. The energy characteristics of the process can be used to assess the effect of high-intensity impulse action on the welding circuit, including the arc plasma and the structure of the resulting weld. As the energy characteristics of the welding process, the welding current Iwd, the voltage on the arc discharge Ud, the power Rp. Oscillograms of the specified characteristics were obtained, as well as the values of the maximum (peak) and average power released in the welding circuit when QPS is exposed to it and without its use were determined. Energy evaluation of input of additional high-intensity pulse effect on welding circuit as ultrasonic energy for cavitations of surface layer of welding bath at QPS was performed. Direct current arc discharge at application of high-intensity pulse effect with frequency of fi.g.= 40×103Gts (QPS) is source of cavitations of liquid phase of metal of welding bath in limited surface layer of preset thickness. It can be assumed that the crystallization of the bath takes place in layers when the welding circuit is subjected to high-intensity pulse exposure with a frequency of fi.g.= 40×103 Gts (QPS). In this case, the growing crystals break when the liquid phase oscillates due to friction forces arising between the moving liquid phase and the growing crystal. At the site of crystal fracture, zones of dynamically super cooled metal are formed, which leads to the appearance of new crystallization centers, and a fine-grained structure of the weld appears.

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Study of Welded Joint Metal Structure under Pulsed Impact on Arc Discharge

Cited by 2 publications

References 4 publications

Arc stability study at the limit mode of welding with coated electrodes

Arc stability study at the limit mode of welding with coated electrodes

Justification of obtaining fine-grained structure of welded joints at high-intensity impulse effect on welding circuit

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