SU1013165A1 - Method of automatic two-arc brazing of tee joints - Google Patents

Abstract

A METHOD FOR AUTOMATIC TWO-ARC WELDING OF TAMPER COMPOUNDS, in which the electrodes are located on opposite sides of the wall of the brand at an angle to each other in the plane, perpendicular to the joint line of parts and along this line sweep one electrode relative to the other by a distance equal to 2-5 thicknesses of welded parts , characterized in that, in order to improve the quality of welded steel by providing. equal heat dissipation in the case of welding seam sections,. curvature, in the process of welding, areas with curvature, change the longitudinal displacement of one electrode relative to another, with an atom, the displacement amount is determined by the formula), e, (1 kP O.IR ЕК is the displacement amount in the capwire where the seam section is, mm; (L e is the amount of displacement on the right-hand side of the seam, -Mm; R is the radius of curvature of the seam.

Description

Abbreviation refers to a techno-stomp of automatic magical two-arc welding, mainly curved seams and can be used in the manufacture of roi ribbed panels, curvilinear tee and I-beams.

A known method of automatic welding with two electrodes located at an angle to each other on opposite sides of the fl 3 wall. The disadvantage of this method is that it causes a concentrated melting of the edge, which causes the formation of curls and reduces the quality of the welded joint. This disadvantage is exacerbated by curved welding.

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A known method of welding, T-joints, by which the welding proyuvod t. two electrodes located in the same plane at an angle to each other from different sides of the wall of the brand. During welding, the electrodes are moved along the weld line and oscillate in one direction in the plane perpendicular to the axis of the weld seam C 2.,.

The disadvantage of this method is that when welding curved seams, when it is necessary to follow the arc, the latter cannot be carried out with oscillations of ectrodes.

The closest to the technical essence and the achieved effect to the proposed is a method of automatic two-arc welding, in which the electrodes are placed at the sides of the stack of the brand at an angle to each other in a flat-shaped line, perpendicular to the line of joint of parts and along this line displace one electrode relative to another for a distance equal to 2-5 thickness of welded to the hoists f 3.

The disadvantage of this method is that it assumes a constant amount of displacement of the electrodes, given depending on the thickness of the material.

However, when welding curved seams with a different radius of curvature (for example, when welding corrugated panels), the conditions of heat dissipation change. In the straight-line section, the heat sink into the base metal is uniform. At small radii of curvature, the distance between the individual parts of the seam is reduced and the heat is concentrated in the metal inside the arc-seam joint. The smaller the radius of curvature, the higher the temperature of the heating of the weld and the heat-sealing §0. Consequently, at a constant welding mode, on the curved sections of the seam, wall burns appear, the dimensions of the seam change and the size of the heat-affected zone, the deformation of the assembly increases, all this reduces the quality of the welded joint.

The aim of the invention is to improve the quality of the welded joint by ensuring uniform heat removal during welding of the weld portions having curvature.

The goal is achieved by the fact that according to the method of automatic two-arc welding of T-joints, in which the electrodes are placed on different sides of the wall under coal, each perpendicular 1 to the "common line of the joint of parts" is adjacent to each other, and along this line one electrode is displaced relatively the other for a distance equal to 2-5 thickness of the parts to be welded, when welding seam sections having curvature in the g process of welding these sections, change the longitudinal displacement of one electrode relative to another, while the magnitude of the displacement determined by the formula

2

ek

-)

(1 +

p - o; G1G

where in,

- the amount of displacement in the curved section of the seam;

b

-the amount of displacement on the straight line of the seam;

R

-radius of seam curvature.

FIG. 1 shows the location of the burners at an angle to each other on different sides of the wall of the T-joint; in fig. 2 is a view A of FIG. 1, (the magnitude of the longitudinal displacement of the electrodes in the seam areas with different curvature).

The essence of the method is as follows.

Corrugated panel 1, assembled with. transversely arranged walls 2, having the outline of one edge in the form of 2 corrugations, are installed vertically. With this position, the panel of the line of the joint between the parts will have a curvature; The welding electrodes 3 and 4 are installed at an angle ot to each other on different sides of the wall 2 of the panel (FNG 1) t. The electrodes are installed in the rectilinear connection area along. different sides of the welded edge at an angle d to each other. Then, the electrode 4 is shifted relative to the electrode 3 in the direction opposite to the direction of welding to the distance Ср (2 - 5), depending on the thickness of the material being welded. The electrodes 3 and 4 serves: 310 Tos to begin the welding process. When the rectilinear linear section of the line of parts joins into a curvilinear radius of curvature R-, the electrode 4 is mixed back during welding by a certain amount and the entire section is boiled with this arrangement of electrodes. When the electrodes reach the area with the radius of the curvature Ro or P., the electrode 4 is set to another value and this section is boiled. Thus, during the welding process, on the variable curvature of the part joining line, the electrode 4 is constantly swept by a certain amount. The magnitude of the displacement depends on the degree of heating of the welded parts. If the heat sink is uniform on the straight section of the junction, then the plating overheats on the outer radius of the curvature R, and the rib overheats on the inner radius Rn. The amount of displacement of the electrodes by. the entire curved path of the seam is determined in advance by the formula where e is the amount of displacement on the curved portion of the seam; 65 n - the value of the offset on the straight seam section; R is the radius of curvature of the seam. As a result of a change in the value of mix. In the process of welding, depending on the radius of curvature of the weld, a uniform forging of welded shafts is achieved, the absence of burns leads to an increase in the quality of the welded joint. Example. Welded ribbed corrugated panels made of steel B NS - 2 with a thickness of 1.5 and 2.5 mm and edges respectively} 1.0 and 2.0 mm. The seam line had and straight sections and curvilinear with radii of curvature of 10, 20 and 30 mm. /. - 60 A,: Welding mode: D. m / h. 8p 2-3 mm. When welding the edges by a known method, we observed burning edges with a small radius of curvature. In areas with a smaller loophole, when the rib goes into the casing, an increase in the seam dimensions, an increase in the thermal influence zone, was observed. This significantly reduced the quality of the site. The table shows the displacement of the electrodes at different seam curvature.

Then the fins were welded in the same mode, w with a change in the venting angle of the displacement in the process of welding on the curved sections in accordance with the data in the table.

After welding, according to the proposed method, there were no burnings, uniform weld formation was observed in all areas, and as a result of uniform heating, there was no deformation of the welded panel .; v

The application of the proposed method in industry will improve the quality of welded units, increase their service life and reduce the cost of their manufacture by 20–30% as a result of a decrease in half a quarter and straightening of the nodes.

The greatest efficiency of the method. Manifests itself when welding large-sized panels made of expensive material (splice or titanium splices). (Welding them with known cnoco6ciM shows a large reject rate. The proposed method will eliminate the defect of welding corrugated panels, which also saves costly material .

1

Claims (1)

METHOD FOR AUTOMATIC TWO-ARC WELDING OF T-BEAM CONNECTIONS, in which the electrodes are placed on opposite sides of the T-wall at an angle to each other in a plane perpendicular to the line of the parts and along this line they move one electrode relative to the other by a distance equal to 2-5 thicknesses of the parts to be welded, differing the fact that, in order to improve the quality of the welded joint by ensuring uniform heat dissipation during s. welding of the weld sections,. having a curvature, in the process of welding sections having a curvature, the longitudinal displacement of one electrode relative to another is changed, while the amount of displacement is determined by the formula where ⁺ 0.1 K - the amount of displacement in the curved section of the seam, mm; - the amount of displacement in a straight section of the seam, mm; R is the radius of curvature of the seam. > 1 1013165