RU70478U1 - CONTACT DOT WELDING DEVICE - Google Patents

Abstract

Usage: when restoring and hardening parts by contact spot welding. The inventive device for resistance spot welding comprises a top electrode on which an insulator is mounted and a bar fixed by means of a bolt. To position the part during welding or welding, a table with a nozzle is used, which is mounted on the lower electrode using a guide. The table is fixed to the flange surface with screws. A sleeve is pressed into the flange, which is fixed from axial displacement by a special screw. The sleeve is fixed on the surface of the holder with a special nut with a handle. Fixing the workpiece from unwanted axial movements during welding is achieved by means of a table and a bolt located at the end of the insulator. The achieved result from the use of the invention is to increase the rigidity of the fastening of the part, thereby welding quality. 2 ill.

Description

The invention relates to welding production, in particular to devices for contact spot welding and can be used in the restoration and hardening of flat parts by welding.

A known machine for butt welding by reflowing the ends of strips of a continuous mill containing a welding transformer, frames with contact clamping pads installed in them. Welding electrodes are installed on the pads. To supply an inert gas, the machine is equipped with a collector located in the area of the contact clamping blocks and located above the welded strips. The collector is equipped with nozzles [1].

A known machine for contact spot welding of reinforcement, comprising: a frame, a bay holder, a correct device, a welding unit, a feeding mechanism in the form of a pneumatic cylinder with a gripper and a cutting mechanism with a chopping knife. The feeding mechanism is equipped with an additional pneumatic cylinder located in the contact zone at an angle to the horizontal plane, and the cutting mechanism contains an emphasis and is positioned so that the distance from the central technological axis to the cutting edge of the knife is equal to the distance from the central technological axis to the stop [2].

The closest in its technical essence is a device for contact spot welding (mainly contact-relief), selected as a prototype, containing movable and fixed electrodes and a bending stop coaxially fixed in the electric holders. The bending stop is fixed on a fixed electrode holder with the possibility of approaching or removing from the axis of the electrodes and

equipped with a set of calibers of different sizes. The movable electrode is made asymmetric, elongated towards the bending stop by the value of the diameter of the bent rod [3].

The disadvantage of these machines and devices is that due to the insufficient rigidity of the fastening of the part when changing the force of pressing the electrodes to the part, the same welding quality is not ensured.

The insufficient rigidity of the fastening of the part is explained by the fact that the reaction force of the part to press the electrodes is transmitted to the chain of parts movably connected to each other (with guaranteed clearances in the joints). As a result of this, the contact area of welding electrodes with filler material is significantly reduced, current density increases, metal spikes and local deformation of the part in the area of the contact spot appear, leading to a decrease in the quality of welding.

The essence of the proposed solution is a resistance spot welding device containing an electric holder, a table and a lower electrode mounted on it by means of a flange, a sleeve, a special screw and a nut with a handle. An insulator is installed on the upper electrode and a bolt-fastened strip. Undesirable axial movement of the workpiece protects the bolt mounted on the end of the bar.

The proposed design allows to increase the rigidity of fastening parts, thereby ensuring the same quality of welding and welding of workpieces.

The invention is illustrated by drawings.

figure 1 - device for resistance spot welding, General view;

figure 2 - view a in figure 1.

The device for resistance spot welding contains an upper electrode 1 on which an insulator 2 and a strip 3 are mounted by means of a bolt 14. At the end of the strip 3, a bolt 15 with a nut 16 is installed for fixing the workpiece. To position the part during welding or welding, table 4 with a nozzle 5, which

mounted on the bottom electrode 7 by means of the guide 6. Table 4 is mounted on the surface of the flange 8 with screws 17. A sleeve 9 is pressed into the flange 8, which is fixed from the axial displacement by a special screw 11. The sleeve 9 is mounted on the surface of the electrode holder 10 with a special nut 12 with a handle 13.

The device operates as follows.

The part 4 is mounted on the table 4 so that the surface to be machined is located between the upper electrode 1 and the nozzle 5. The screw 15 is set to the amount of extension of the upper electrode 1 by means of the nut 16. Using the compression drive, the upper electrode 1 is brought to the surface of the workpiece, between which the filler material is placed supply electric current to the electrodes 1 and 7, thereby starting the welding process of the filler material. At this moment, forces arise from the reaction of the welding process, aimed at displacing the workpiece and the electrode of the upper 1. Such displacement is opposed by the forces created by the table 4 and the bolt 15.

Using the device allows to provide high quality welding.

Information sources:

[1] Utility model of the Russian Federation No. 31748 U1, cl. B23K 11/04, B21B 1/22.

[2] Utility model of the Russian Federation No. 54846 U1, cl. B23K 11/04, B21F 27/10.

[3] Utility model of the Russian Federation No. 9780 U1, cl. B23K 11/10.

Claims (8)

1. A device for contact spot welding, comprising a top electrode with an insulator and a strap, a table with a nozzle mounted on the bottom electrode by means of a guide that is mounted on the surface of the holder using a flange, a sleeve and a special nut, characterized in that the workpiece is fixed from unwanted axial movements in the welding process is performed by means of a table and a bolt fixed to the bar. 2. The device according to claim 1, characterized in that the nozzle on the lower electrode is removable. 3. The device according to claim 1, characterized in that the bolt for fixing the workpiece is made with the possibility of adjustment. 4. The device according to claim 1, characterized in that the upper electrode is equipped with a removable insulator with a strap. 5. The device according to claims 1 and 4, characterized in that a removable insulator with a strap is rigidly mounted on the surface of the upper electrode. 6. The device according to claim 1, characterized in that the table is equipped with a flange. 7. The device according to claims 1 and 6, characterized in that the flange is provided with a sleeve. 8. The device according to claim 1, characterized in that the special nut is made with a handle.