JPS59197386A - Electrode for welding lead wire - Google Patents

Abstract

PURPOSE:To provide an electrode for welding a lead wire which can weld the lead wire with the smaller diameter of a groove through which the lead wire passes than in the prior art, eliminates the reactive current making no contribuion to welding and improves the accuracy in the welding position by forming insulating layers on the opposed surfaces of a pair of electrodes and the groove through which the lead wire passes. CONSTITUTION:A lead wire 3 is welded to an object 4 to be welded by the constitution consisting of electrodes 1, 2, the lead wire 3, the object 4 and a groove 5 through which a lead wire passes like in the prior art. Insulating layers 6, 7 are respectively formed on the opposed surfaces of the electrodes 1, 2 and the groove 5 by ''Teflon'' or ceramic coating and calcining or vapor deposition. The welding is consequently accomplished with the smaller diameter of the groove 5 than in the prior art by the presence of the layers 6, 7 and the reacting current making no contribution to welding is eliminated. The resistance heat is thus concentrated on the welding surfaces of the electrodes 1, 2 by which the welding is accomplished satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lead wire welding electrode for series spot welding a lead wire to an object to be welded such as a capacitor element.

The structure of the conventional example and its problems The structure of the conventional example will be explained below with reference to FIGS. 1 and 2 of the drawings.

Reference numeral 1.2 denotes a pair of opposing electrodes, which are held by pressurizing means (not shown). 3 has a spiral part 3+ at the tip
A is a molded lead wire, 4 is an object to be welded, and 5 is a lead wire passage groove.

Next, the operation of the conventional example will be explained. The lead wire 3 with the spiral portion 3a formed at the tip is inserted into the lead wire passage groove 5.
It is arranged between a pair of electrodes 1 and 2 facing each other.

Then, the pair of electrodes 1.2 facing each other presses the spiral portion 32L of the lead wire 3 against the workpiece 4 using a pressure means (not shown), and energizes the electrode 1. The spiral portion is welded to the workpiece 4.

However, since the welding method in the conventional example is series spot welding, if the lead wire passing groove 5 is made small, the current flows from one electrode 1 through the lead wire 3 to the other electrode 2. There is also a drawback that the reactive current that does not contribute to welding increases, resulting in poor welding. Furthermore, by increasing the diameter of the lead wire passage groove 5, it is possible to reduce the reactive current that does not contribute to welding.
The disadvantage was that the welding position was easily misaligned.

Purpose of the Invention The present invention eliminates the drawbacks of the conventional lead wire welding electrodes, and eliminates reactive currents that do not contribute to welding, increasing welding efficiency and still ensuring good welding position accuracy. The purpose is to provide electrodes for lead wire welding.

Structure of the Invention In order to achieve this object, the present invention forms an insulating layer on the opposing surfaces of a pair of electrodes and the lead wire passage groove by baking or vapor deposition, and makes the diameter of the lead wire passage groove smaller than before. This eliminates reactive currents that do not contribute to welding and improves welding position accuracy.

Description of examples Hereinafter, FIG. 3 of the drawings will be described with reference to one embodiment of the present invention.

This will be explained along with FIG. 15 2,3p 4y 5 is the same electrode, electrode, lead wire, and object to be welded as before.

This is a lead wire passage groove. 6 and 7 are the electrodes 1 and 7, respectively.
2 and the lead wire passage groove 6 are coated with Teflon or ceramic and formed by baking or vapor deposition. The method of welding the lead wire 3 to the object to be welded 4 using the electrode 1.2 is the same as the conventional method. and the insulating layer 6. Due to γ, the lead wire passing groove 5 is smaller than the conventional one.
This allows the diameter of the weld to be reduced, eliminates reactive current that does not contribute to welding, and improves welding position accuracy.

Effects of the Invention According to the present invention, the following excellent effects can be achieved.

(1) Since the insulating layer is provided on the opposing surfaces of the pair of opposing electrodes and on the lead wire passage groove, it is possible to eliminate reactive current that does not contribute to welding. Therefore, concentrated resistance heat is generated on the welding surface of the electrode, a satisfactory and reliable welding result can be obtained, and the life of the electrode can be further extended.

(2) Since the diameter of the lead wire passage groove can be reduced by the insulating layer, the accuracy of the lead wire contact and exit positions can be improved.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional lead wire welding electrode;
3 is a front view showing a lead wire welding electrode in one embodiment of the present invention, and FIGS. 5 to 4 are side views showing opposing surfaces of the electrode. 1.2... Electrode, 3... Lead wire, 4
...Welding object, 5... Lead wire passage groove, 6, 7... Insulating layer. Name of agent: Patent attorney Toshio Nakao (1st person)
figure

Claims (1)

[Claims] Lead wire welding in which a pair of electrodes are provided facing each other for series spot welding of a single lead wire to an object to be welded, and an insulating layer is formed by baking or vapor deposition on the surfaces facing each other through the lead wire and on the lead wire passage groove. electrode.