Nonconsumable electrode

 

(57) Abstract:

Usage: welding multipass welds in hard to reach places and when single-pass welding of thin-walled structures. The essence of the invention: a working end of a consumable electrode made in the form of a cone whose axis is at an angle to the axis of the electrode, and its peak is shifted relative to the axis of the electrode. The amount of displacement (Rk) is from 0.5 to 1.5 diameters of the electrode. 3 Il., table 1.

The alleged invention relates to the field of welding in shielding gases and can be used as welding parts of greater thickness on usewelcome gap and single-pass welding of thin-walled structures, such as a hard calculation program on the CNC when the electrode impart rotational motion around the circumference.

Known nonconsumable electrode for welding in shielding gases with a conical working part, the top of which is offset relative to the axis of the electrode [1]

The disadvantage of this electrode is a slight angle and amount of displacement of the apex of the cone of the working part of the electrode. This does not allow full use of the technological capabilities of the arc, including gewesten nonconsumable electrode arc welding in shielding gases, containing cylindrical and conical working part [2]

The disadvantages of this electrode should be attributed to the low technological possibility for variation of the angle of the arc to the surface of the product.

The closest in technical essence to the described is an electrode containing cylindrical and conical working part [3]

The disadvantage of the electrode is low resistance when welding at high current densities.

Proposed nonconsumable electrode is different from the known fact that the axis of the conical working part is located at an angle to the axis of the cylindrical part of the electrode, and its peak is shifted relative to the axis of the electrode by an amount defined by the equation Rk=(0,5-1,5)d, where Rkthe offset of the axis of the electrode, mm d diameter of the electrode.

The proposed solution is illustrated in Fig.1 3, which is shown in Fig. 1 nonconsumable electrode with a tapered working end of Fig.2 is the same, combined with a working end comprising a truncated cone and cone with a larger solid angle at the vertex of Fig.3 location map nonconsumable electrode in the device for local heating and bending at a given angle.

Nonconsumable electrode (the cone 2' (Fig.2), the top of which is cut off by the surface of the second cone with a solid angle at the vertex is less than 180oand the tops of both cones lie on the same axis.

The solid angle at the vertex of the cone 2 and 2' is 20-70oand the axis of the cone 2 and 2' is located at an angle b equal to 10-60oto the axis of the electrode.

The top of the cone 2 and the truncated cone 2' is displaced relative to the axis of the cylindrical part 1 a non-consumable electrode more than half of the diameter of the electrode Rk=(0,5-1,5)d.

It is found experimentally that if the solid angle a at the vertex of the cone 2 (Fig.1) and the cone 2' (Fig.2) will be less than the 20othen sharply decreases the resistance of the electrode due to excessive overheating of the working end.

When a is greater than 70oreduced density of the arc column and its stable combustion due to heating of the working end and the wandering of the cathode spot of the arc on its surface.

The angle of inclination of the axis of the working end to the axis of the electrode and the surface of the product has a great influence on the force of the arc and conditions of the input heat energy into the product.

The greater the angle of inclination of the electrode (the working end) of the product, the more horizontal and less vertical component of the arc pressure is the bottom to use when welding products as small, and large thickness. If the angle b is less than 10othen the horizontal component of force of the arc will be excessively small, and the vertical is great. In this case, to obtain the effect of the stabilization quality by reducing thermal thin-walled products cannot. If the angle b is greater than 60o, significantly reducing the efficiency of heating products arc.

The greatest impact on the efficiency of heating products arc provides the magnitude of the eccentricity of the vertex of the cone (the working end) Rk.

C increase of Rkwhen welding with the rotational movement of the working end around the circumference, the efficiency of heating products arc initially increases up to a certain limit, and then falls.

It is found experimentally that the maximum occurs when Rkclose to, but not greater than half the width of the liquid bath, which can be obtained when welding on the normal electrode.

The ratio of the practical values of the welded thickness, joint width, electrode diameter and the optimal values of Rk(table) show that Rkless than 0.5 d is impractical.

Values of Rkexceeding half the width of the liquid bath, the five-overlay surface decorative seams, for heating during soldering, to the local surface heat treatment, sensing, etc.

Thus the displacement of the vertex of the cone relative to the axis of the electrode must be more than half the diameter of the electrode.

The solid angle (Fig.2) choose more angle, but less than 180o. The greater the angle, the more blunt cones 3 (Fig.2), the higher the resistance of the electrode at a given current density.

Nonconsumable electrode of the proposed design was tested in multi-pass welding of short joints 45 mm thick steel ANS-2 delavau gap width 8-12 mm. Welding performed tungsten electrode with an angle a= 60oangle b=30o, Rk=6 mm (1.5), the angle g=90o. Welding was performed with a constant current value 2855 A. working electrode prior to the destruction of its cathode surface was 427,5 of uppercase, which is approximately 1.5 times greater than in the known electrode.

Proposed nonconsumable electrode was also tested in the welding program at CNC thin-walled structures with flat and curved panels of steel ANS-2. Butt-joint with thick edges, 1.5-2.5 mm were welded on weight unlined and clamps with protection how b 40o, Rk=1.8 mm (0,6). Working electrode prior to the destruction of the cathode surface was 480 Ah. Defects in the seam when the displacement of the electrode from the axis of the seam to 1.0 mm was absent.

Nonconsumable electrode with an eccentric working end is made as follows.

Nonconsumable electrode to the cylindrical portion 1 and a conical part 2 the pointed end into the hole 3 of the base 4 of the device for bending of the electrode (Fig.3).

On the base 4 is installed with the possibility of trimmer movements, the emphasis 5 on which is mounted a working, bending spring 6. When the local heating of flexible electrode in the bottom of the cone to plastic state by an electric arc through the burner 7 for argon-arc welding, under the action of the force P of the working of the spring 6, the cylindrical portion of the electrode 1 is deflected to another 5 at a given angle b..

After cooling in a stream of protective gas burner 7 and liberation from the working of the spring 6, the electrode is ready for use.

To change the angle of the cone to the axis of the electrode at the bend, the movable stop 5 move in closer to the hole 3 or deleting from it on the indicator line, sacrebleu part, characterized in that the axis of the conical working part is located at an angle to the axis of the cylindrical part of the electrode, and its peak is shifted relative to the axis of the electrode by an amount defined by the equation

Rto(0,5 1,5)d

where Rtothe offset of the axis of the electrode, mm;

d is the electrode diameter, mm

 

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