JPS5976684A - Electrode for welding or brazing - Google Patents

Abstract

PURPOSE:To generate heat from the electrode itself by the contact resistance of a heat generating electrode and an insert electrode and to perform welding by providing the freely exchangeable insert type electrode to the top end of the heat generating electrode, fixing one root part thereof to a water-cooled electrode and forming a desired electrode. CONSTITUTION:A hollow insert type electrode 23 is taperingly fitted to the top end of a hollow heat generating electrode 22, and the root part thereof is fixed to the top end of a water-cooled electrode 20; further a shield cap 25 is attached, via a rubber O-ring 26, on the outside circumference thereof, thereby forming a desired electrode. The tapered part 21 of the electrode 20 is fixed to the electrode holder of a welding machine and a nonoxidative gas is fed through the gas hole 27 of the gap 25 to enclose the electrode part with the gas, then the conduction of electricity under pressure is started to generate heat from the electrode itself by the contact resistance of the electrodes 22, 23, whereby welding or brazing is accomplished. The welding of a material having small electric resistance and high thermal conductivity is thus made possible and the damaged part of the electrode is efficiently exchanged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electrode used in a resistive welding machine to perform welding, brazing, etc. connections.

[Technical debt of the invention and its problems]

Conventionally, when welding or brazing, including soldering, using a resistance welding machine, the electrode used was a molybdenum cap-shaped electrode (2) at the tip of a water-cooled electrode (1), as shown in Figure 1.
It is brazed or press-fitted. Although such an electrode is shown in JIS C9304, the water cooling hole (3) provided in the water cooling electrode (1) passes into the cap shaped electrode (2) to prevent cap molding. In other words, when joining such as resistance welding or brazing with the above-mentioned electrodes, the joints or brazing material are not melted by the heat generated by the electrode itself, but by passing a large current through the objects to be joined. Melting is performed by utilizing resistance heat generation of the objects to be welded or contact resistance heat generation caused by the objects to be welded together.

The use of the above-mentioned electrodes is effective for joining hazardous materials such as steel plates, where the metal itself has a high resistance and generates sufficient heat due to resistance.

However, it is not effective for converting monthly charges, such as copper phase, which have a low m% resistivity and a high thermal conductivity. This is because when a current is passed through the steel material using the above-mentioned single pole, the electrical resistivity is small, so the resistance heat generation by the copper phase itself becomes small. Further, heat generated due to contact resistance between objects to be joined is quickly dissipated due to the high thermal conductivity of the steel material. Therefore, it is not easy to obtain a predetermined amount of heat at the joining point, and it is very difficult to join, for example, a copper phase and a copper material, or a preparation and a copper phase. Therefore, in order to join such materials, there is an electrode that generates heat in itself to melt the joint or the brazing material. In many cases, the electrode in this case is made by press-fitting or brazing a heat-generating TFT pole made of molybdenum or the like and having an arbitrary cross-sectional shape onto the tip of a water-cooled electrode, thereby causing the heat-generating electrode to generate heat. however,
In this case, it is effective for joining preparations, etc., but since the heating electrode is not cooled to generate heat, a lot of wear and damage occurs, and it becomes necessary to replace the defective heating electrode. However, as mentioned above, the water in the heat-generating electrode is press-fitted or brazed into the electrode, which requires a lot of effort to replace. Furthermore, although wear and tear on the heating electrodes is limited to the portions that come into contact with the objects to be welded, it is extremely wasteful to replace all the heating electrodes.

[Purpose of the invention]

The purpose of the present invention is to make it possible to join materials such as steel, which have relatively low resistivity and high thermal conductivity, by welding or brazing, and to easily remove wear and damage points. Welding or brazing can be done without wasting any waste and providing the ultimate in convenience.

[Summary of the invention]

The electrode of the present invention is characterized in that a heating electrode with a replaceable insert-type electrode at the tip is provided at the tip of the base electrode, and stains may occur due to contact resistance between the heating electrode and the insert-type electrode. generates heat more effectively than conventional methods,
Furthermore, in the event of wear or damage, only the insert-type electrode that comes into contact with the object to be welded is replaced.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a sectional view showing this embodiment. A hollow cylindrical heating electrode (22) is fixed to the tip of the water-cooled electrode (2o) with a screw. Furthermore, a hollow insert-type electrode (23) is similarly inserted into the tip of the heating electrode (22), and this insert-type electrode is replaceable. The water-cooled electrode (20) is opened from the upper end and has a cooling hole (24) for cooling the water-cooled electrode (20). The upper part (21) of this water-cooled electrode (2o) is tapered so that it can be attached to an electrode holder of a resistance welding machine (not shown). Further, a shield cap (25) is provided around the lower part of the water-cooled electrode (20), and is supported by a rubber O-ring (26) provided around the water-cooled single pole (20). The shield cap (25) has a heating electrode (2
2) and the insert type electrode (23) with non-oxidizing gas.
5) Inject 15 tons of non-oxidizing gas from the inlet (27) provided on the side. Furthermore, two gas holes (public) are provided on the side of the heating electrode (22), and the non-r#' and oxidizing gas also flows into the inside of the heating electrode (22) and the cap-shaped electrode (23). .

A part (21) where steel materials and steel plates are brazed using the above-mentioned electrodes.
) has been inserted and fixed. Furthermore, a shield cap (25
) is attached to the inlet (27). The material to be joined is a brim (35) on one end.
Cap pipe (36) equipped with this copper pipe (36)
It is a ☆i14 plate (37) with a hole passing through it.

These t11fl pipes (36) are counterfeited by having a ring-shaped wax ring (38) between the pipe (35) and the copper plate (37). Such a device allows copper pipes (36
) and the copper plate (37) are brazed. At this time, the resistance welding machine sends one current through the upper and lower electrode holders (31), and connects the electrode to the objects to be welded, which are the copper pipe (36) and the steel plate (3).
7) and at the same time connect the electrode to the copper vial (3).
Pressure is applied so that 6) and the steel plate (37) come into close contact after joining. In addition, non-oxidizing gas blows out from the inlet (27) and generates heat, covering the a-pole (22) and the cap-shaped single-lupole pole (23). At this time, when electricity is applied from the resistance welding machine, the heating electrode (22) and the insert type electrode (23) generate a large amount of heat due to the contact resistance between the two and the resistance of the respective electrodes (22) and (23) themselves. Furthermore, since this heat is not cooled by the cooling water in the cooling hole (24) provided in the Suito electrode 06, the copper pipe (36) and the steel plate (37) can be sufficiently heated. Therefore, the brazing material (38) can be easily melted and inserted between the copper pipe (36) and the steel plate (37) to perform brazing.

In this way, the heat conductivity is higher than that of the copper pipe (36), and heat is generated rapidly.Also, even with the copper pipe (36), which has a low resistivity and generates little resistance heat generation, the heating α pole (22)
Due to the heat generated by the insert type electrode (23) itself, brazing could be easily performed.

Here, heat is also generated due to the contact resistance between the heat generating electrode (22) and the insert type electrode (23), which has the effect of generating even more heat than conventional heat generating electrodes.

In addition, there is a problem that the heat-generating electrode (22) and the insert-type electrode (23) are oxidized due to heat generation, but this is because the non-working gas always surrounds these electrodes (22) and (23). Because of the antioxidant effect, the problem is solved. Furthermore, the non-oxidizing gas of the oxidation gas is released near the joint of the steel plate (37), the gas hole (23) provided in the pole (23),
Since the surface of the copper pipe (i6) is also covered from 28), oxidation of the bonded product itself can be prevented and a good finish can be achieved. In addition, insert type electrodes (23
) is a heating electrode (22) and copper pipe ('36) made of steel plate (
It is easy to wear out due to heat generation due to contact resistance with the bonded object such as 37). For this reason, the insert type electrode (23) is simply inserted and attached to the heating element (22) in the taber, making it easy to replace.

In addition, the heating electrode (22) and the insert type electrode (23)
These electrodes (22) may vary depending on the material or shape of the joint.
.

It does not matter if the shape of (23) is changed arbitrarily, and in Eq.
The electrodes attached to the upper and lower electrode holders (3I) of the resistance welding machine may each have a heat-generating α pole (22) and an insert-type base pole (23) of different shapes.

〔Effect of the invention〕

As explained above, in the present invention [4 poles are made of +11. Even with materials that have low air resistivity and low thermal conductivity (a-contact or brazing is possible fever was possible.

Furthermore, since only the defective or damaged parts of the present invention can be replaced, there is no need to replace all the heating electrodes, and there is no waste, which is very effective.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the conventional electrode, Fig. 2 is a 1 m cross-sectional view showing the implementation of the present invention, and Fig. 3 is a partial sectional view of the process of performing soldering using the embodiment. It is. (2L) Door...Water-cooled electrode, (22)...Heating electrode, (23)...Insert type electrode, (25)...
・Shield cap. Agent →1・Buido Nori Chika N, right (and 1 other person) Kan 1 Figure ゝ-11~〃

Claims (1)

[Scope of Claims] 1. A heating electrode having a replaceable insert-type electrode at the tip thereof is provided at the tip of the water-cooled electrode.
For contacting or brazing electrodes. 2. The water-cooled Ia electrode has the insert-type electrode and the heat-generating electrode.
The first scope of the patent application is characterized in that it is equipped with a shield cap for blowing non-oxidizing gas into the pole and 14.
The 4-contact or brazing electrode is included in the section.