Development of the Device for Two-Strip Cladding with Controlled Mechanical Transfer

Calculation of the penetration zone geometric parameters at surfacing with a strip electrode

“…As the thickness of the strip electrode increases, the estimated temperature values of a liquid metal decrease. For example, if one uses the 0.5 mm thick strips, then Т=(2,150-2,400) ºС, and for strips that are 1.0 mm thick, Т= (2,510) ºС. Similarly, when using a wire of d e =3 mm, then Т=(2,700-3,120) ºС, and for a wire with a larger diameter d е =4 mm, Т= (2,950) ºС.…”

“…One of the ways to extend the technological capabilities of surfacing under the flux by a strip electrode in the restoration and strengthening of working surfaces is the use of controlled mechanical transfer of an electrode metal. The benefits of using it at surfacing under the flux were shown for both one [1] and two strip electrodes [2]. In this case, it is possible to ensure a more even distribution of thermal energy along the width of the weld pool, as well as when changing the angle of the strip's turn relative to the surfacing vector [3], as well as adjust the heat flow by the depth of the penetration zone.…”

Improving a resource­saving surfacing technology using two ribbon electrodes with a controlled transfer of electrode's metal

“…Study into the feasibility of such a technique for surfacing when using two ribbon electrodes [7,8] showed the prospects for this method. At the same time, the conditions for electrode metal melting and its transfer into a welding bath pool when using two or more electrodes are different from those when surfacing using a single electrode, especially at different values for ribbon feed speed.…”

“…The oscillation amplitude of ribbon electrodes' ends is related to the magnitude of eccentricity and the distance between the ribbon electrodes, as well as the mass of drops of the electrode's metal, whose magnitude is determined by the cam's frequency of rotation. We have studied an oscillation frequency range of ribbons within f=30÷70 Hz, defined as important to control the transfer of an electrode's metal [6][7][8]. The process of surfacing when using two ribbon electrodes, even when applying the fluxes recommended for arc welding, occurs partially as the electroslag process, because a certain percentage of current is shunted by the molten slag.…”

Impoving energy characteristics of the welding power sources for TIG-AC welding

“…The quality of a welding joint is also affected by the dynamic properties of a power source [12,13]. Given this, sources for pulse-arc welding are being developed [14].…”