SU703273A1 - Method of automatic control of the depth of welding bath - Google Patents

Description

The invention relates to the welding industry, to the technique of smelting of the e-welding welding and can be applied in any industry that uses this method of welding. A known method for measuring the weld pool using radioactive isotopes. The disadvantage of it is the need to observe special rules for safety, the presence of special equipment. The closest in technical terms and effect to the invention is a method for automatically adjusting the depth of the weld pool during electroslag welding, in which a probe is placed through the forming slider, isolated from the slider body, the probe is in contact with the weld pool and electrically binds it the actuator, and in the weld pool periodically flux is fed through the feed mechanism. However, the presence of a slag crust formed between the weld pool and popzun, having different thickness and electrical conductivity and the absence of a strictly fixed contact between the cork and probe, significantly distorts the work of the probe and does not provide a clear position fixation for the weld pool. The aim of the invention is to improve the quality control of the depth of the weld pool. The goal is achieved by making a groove on the working surface of the forming slider below the level of the probe, the probe is positioned below the uncrystallized reel of the groove and flush with the bottom of the groove and connected to the flux supply mechanism in the weld pool.

Ma drawing shows the scheme of the re-arrangement of the method.

Automatic adjustment of the weld pool depth, i.e. maintaining its Ezhzhniy level at a given distance from the upper edge of the slide, using the proposed method, is carried out using the mapa shown on the drawing; for example copper or will ({) ram probe 1, pressed into the copper slider 2. This probe

Must be isolated from the body of the slide with mica or ceramics. For more reliable operation of the copper probe, it should be water cooled. The end of the loop is located flush with the bottom of the groove 3, which extends from the probe to the bottom half of the ring. Above the groove probe no. This probe is the contact of the actuator, which switches on and off the flux supply to the welding rod. . The flux is supplied by a metering device set in motion by a motor. The principle of the probe is as follows. After induction of the shdak bath at the beginning of welding in the usual way and obtaining a stable process, the dispenser is connected to the automatic flux supply. At a normal depth of the gauge, which sets with the technical process (about 5 ~ 60 mm), the crystallization of the lower layers of the metal bath 4 near the slider takes place slightly above the probe 1. In this case, at. The ascent of the automaton during the welding process, which crystallized parts of the seam 5, covered with a thin layer of pork b, will not be; after the probe, located in the groove of the slider 2 and the voltage in the probe chain, will be zero. In this position of the weld pool, the flux metering motor will be powered, which will ensure the supply of the flux from the hopper to the weld pool. Instead of a metering unit, flux can be added manually by a signal from a probe. The amount of flux supplied to the weld pool should be greater than the amount of slag forming the crust on the weld surface. Since the lifting speed of the automaton at the ESW (due to visual observation of the specialized specialist, device) is maintained so that the surface of the keeper is at a predetermined distance from the upper edges of the sliders, during operation, the dispenser depth of the bath will gradually increase.

Claims (1)

Increasing the depth will cause its bottom to be at the level of the torn probe and the liquid phase of the weld pool 4 will flow into the groove in which the probe is placed and even when a small voltage is applied to the pgup circuit, the power supply of the flux meter motor will be turned off. As a result, stop the flow of flux into the weld pool. Termination of the flux supply will cause a gradual decrease in the bath depth due to the consumption of liquid slag for the formation of a slag crust on the surface of the seam. After the bottom of the weld pool rises above the end of the probe, a & automatic activation of the flux supply to the weld pool will occur. As a result of periodic switching on and off of the flux supply, the lower level of the welding bath will automatically be maintained in the vicinity of the grout, i.e. at a certain distance from the upper edges of the sliders. The depth of the Kaivka groove on the slider in which the probe is placed is made within the range of 0.4-O, 5 mm. At values less than 0.4 mm, the clarity decreases. fixing the bottom of the weld pool, and at values greater than 0.5 mm, welds may appear on the weld seam, requiring subsequent cleaning or welding weld leaks may occur during welding. Groove Width Slightly larger than the diameter of the hole drilled for the probe in a slider. To ensure a free exit of metal and slag periodically falling into the groove and solidifying there, the end of the probe is installed flush with the bottom of the groove and the groove grooves are wedge-shaped with a slight expansion (1-1.5 mm per side). The depth adjustment of the weld pool is made by changing the distance of the weld pool, and the decrease is to increase its depth. The work of the proposed automatic welding machine will ensure the improvement of the quality of welded joints and significantly reduce the amount of expensive repair of welds. In addition, the use of this device automates the control operation of the weld pool, which will reduce the number of workers servicing the plant for ESW and entrust the welding of products to operators of lower qualification. - In addition, the principle of the proposed device for adjusting the depth of the 70 SOW bath can be in other areas of industry, namely, to solve the problem of controlling the speed of the ingot drawdown with continuous metal smelting in the crystallizer, where significant technical and economic effect can also be obtained. Claims The method of automatically adjusting the depth of the weld pool during electroslag welding, in which a through-hole is placed in the forming slider and insulated from the casing, the probe touches the weld pool and electrically connects it to the actuator, and periodically flux is supplied to the weld pool using feed mechanism, characterized in that, with a chain of improved quality control of the depth of the weld pool, on the working surface of the forming slide below the level of the probe rule welding groove is performed, the probe is located below the level of the metal bath nezakristappizovavsheys flush with the groove bottom and is connected to the feeder-flux to the weld pool.