DE388172C - Electric resistance welding machine - Google Patents

Description

(Sch 6590g

The invention relates to an electrical resistance welding machine, which like an electric hand tool, ζ. B. in Art the electric hand drills, can be used. The contact areas of the two adjacent; Electrodes lie in one plane, so that the machine for structural parts of any size can be used. It can be used to weld a seam

ίο used between the electrodes runs; it can also be used to weld on a sheet-like part, e.g. B. one Sheet metal, can be used by adding local heating to the seam underneath Welding temperature is brought. So the part that is welded on does not need to be to be heated to its full strength. For the machine is handled by handles for small amounts of work; for greater achievements will

ao they hung on a hoist.

The welding pressure is according to the invention in a novel way by the machine exercised by the fact that the relative to the electrodes displaceable iron core of the

as .Transformer is designed as a magnet, which is firmly attracted to the weld metal and transfers this force to the electrodes.

In the exemplary embodiment is shown in Fig. 1 eia Section through the machine shown, in Fig. 2 a section perpendicular to the former, and Fig. 3 shows the contact area between the electrodes and the magnet and the weld metal.

3-5 α is the horseshoe-shaped iron core of the transformer, which is provided with the primary winding &; c is the secondary turn which ends in the electrodes d ·. The secondary winding is attached to a cap e which has handles / and a guide g for a pin h of the transformer core a. The transformer is held by a spring i in such a position to the secondary current body that when the electrodes d are placed on the weld metal, a gap h still remains between the core α and the weld metal. If the current is now switched on, the core α acts as a magnet and is pulled down onto the weld metal. This tensions the spring i and presses the electrodes d firmly onto the weld metal,

The contact surface of the electrodes d and the magnet α with the weld metal is combined in the smallest possible place. For this purpose, the welding current and the magnetic lines of force run cross-shaped in the weld metal, namely the welding current in the layers closest to the contact surfaces of the electrodes, the magnetic force line field in the full strength of the material.

Claims (3)

Patent Claims: i. Electric resistance welding machine with two electrodes, their contact surfaces lie in one plane, characterized in that the transformer core and the electrodes are arranged so that they can be moved relative to one another in such a way that that the welding pressure increases due to the magnetic attraction of the transformer core the Scijweißgut is effected. 2. Electrical welding machine according to claim i, characterized in that between the transformer core and the secondary winding carrying the electrodes a spring is arranged in such a way that after the electrodes are seated on the weld metal, the transformer core starts the weld metal is brought up under tension of the spring, which transfers the pressure to the electrodes. 3. Electrical welding machine according to claim 1 and 2, characterized in that the connecting line of the electrodes (d ) intersects with the connecting line of the magnetic poles (a). Fig. Fig.