SU859083A1 - Fusion welding method - Google Patents

Description

one

The invention relates to welding equipment, namely to electroslag welding of various metals, mainly in an external magnetic field, and can find wide application in the non-ferrous metallurgy, electrical and chemical industries for welding aluminum bus ducts, as well as in other branches of the national economy.

There is a known method of electroslag welding with a plate electrode, in which insulated pockets are used at the beginning of the welding process and do not include the product in the welding circuit C1

The disadvantage of this method is the impossibility of high-quality welding in an external magnetic field.

The closest to the proposed method is electric fusion welding, in which the welding circuit is divided into two separate branches, each of which includes a part to be welded, and during the welding process regulate the amount of welding current in each branch, changing its active and inductive resistance: laziness 23.

The disadvantage of the known method is the necessity of using two electrodes and placing them across the axis of the welding gap, which increases the welding gap during electroslag welding.

The purpose of the invention is to provide a guaranteed uniform penetration of both weld edges at

10 welding in an external magnetic field.

The goal is achieved by the fact that the separation of the welding circuit is performed by dividing the reverse current lead, whose branches

15 are attached to both parts being welded.

The drawing shows the scheme of the proposed method.

20 At the 1st welding, 1 a hibernating forming device, consisting of suspension 2, discharge bars 3 and crystallizers 4. Welding electrode 5 is inserted into the gap between the edges to be welded, to which one pole of the power supply b and the second pole are connected connected to the welded parts m 1 with two pairs of branches 7 and 8, in

Claims (2)

30, which are successively connected to ammeters 9 and 10 and variable resistances 11 and 12. In the pocket of the pallet 2, the slag bath 13 is led and, feeding welding electrode 5, the welding process begins. Pr im. Welding of aluminum busbars with a section of 70x515 mm in an external magnetic field. Under the action of an external magnetic field, the main part of the welding current is directed along the left branch 7 of the welding circuit, which is controlled by the readings of ammeters 9 and 10. The readings of the ammeter are 92.5 kA, and the ammeter is 10 2, Ok. Due to the fact that the welding current in the left branch 7 more, then, naturally, the left weld edge melts with earlier than the right. Since only one left edge is boiled at the starting welding time, the current in the left branch 7 of the welding depot begins to increase sharply, and in the right branch 8 it decreases and 30 seconds after welding, the values of ammeters 9 and 10 are respectively 3.5 and 1, Зк With an increase in the number of currents in the left 7 and right 8 branches of the welding circuit, the probability of penetration of the right edge decreases and practically reduces to zero. ;. To ensure a guaranteed uniform penetration of both edges to be welded, variable resistances 11 and 12 during the welding process increase the resistance of the left branch 7 and reduce the resistance of the right branch 8 of the welding circuit, and the amount of current in both branches is controlled according to the instructions of ammeters 9 and 10. the resistances of the left 7 and right 8 branches of the welding chain, the readings of the ammeters 9 and 10, respectively, became 2.0 and 2.1 kA. As a result, penetration of the right edge to be welded occurs, which is confirmed by a further spontaneous increase in the welding current in the right branch 8 to 3.0 kA and a decrease in the current in the left, branch 7 to 1.5 kA without changing the position of the resistances 11 and 12. After that Again, change the resistances of the branches 7 and 8 so that the readings of the ammeters 9 and 10 are the same, i.e. 2.25 kA. With the help of resistances 11 and 12, during the whole welding time, they maintain the balance of currents in the left 7 and right 8 branches of the welding circuit. The molten metal of the electrode 5 and the edges to be welded 1 forms a metal bath 14, which, crystallizing, gives the weld seam 15. As a result of welding, a high-quality weld is formed with no welds. As a comparison, two welding experiments were carried out in an external magnetic field with all similar parameters without adjusting the current in parallel branches of the welding circuit, while in these two experiments, the direction of the magnetic field lines was the opposite, as a result The first experiment was a complete lack of penetration of the right. weldable edge, and in the second, the left edge. This proves the necessary adjustment of the welding current in the left, 7 and right. Howl 8 branches. x welding circuit when welding in an external magnetic field. The magnetic field strength in all three experiments was 3510 4010. Welding voltage 34-36 V, welding current 4.5 kA. Welding was performed on an A-550U apparatus with a TM10000 / 1 power source. The proposed method can be used for electroslag welding of light metals, based on the floating of molten metal in a more dense slag medium. . The application of the proposed method allows to significantly improve the quality of welded joints during welding in an external magnetic field, provides an opportunity to control the quality of weld formation during the welding process, and improves the working conditions of the operator-welder. . The invention The method of electric melting welding, mainly electroslag in an external magnetic field, in which the welding circuit is divided into two parallel branches, each of which includes a part to be welded, and during welding process the size of the welding current in each branch changes its active and inductive resistance, about the aphidiu Y: With the fact that, in order to ensure a guaranteed uniform penetration of both edges being welded when welding in an external magnetic field, the mentioned separation of The armature circuit is produced by means of the bifurcation of the reverse current lead, whose branches are attached to both parts to be welded. Sources of information taken into account in the examination 1. USSR Copyright Certificate 149166, cl. At 23: 25/00, 1962. 2. Velfor M.G. and lr, Equipment for arc and slag welding and surfacing. M., Higher School, 1974, p. 116-127.