JPS59202189A - Joining method of iron and copper by resistance heating - Google Patents

Abstract

PURPOSE:To join iron and copper to high quality by using an inexpensive brazing filler metal without requiring the operator's skill by providing the brazing filler metal between the iron and the copper and a heating plate having high electrical resistance between the copper and an electrode and heating and press welding the iron and copper in a short time with a resistance welding machine. CONSTITUTION:Foil of a copper-phosphorus alloy is sandwiched as a brazing filler metal 3 between, for example, an iron plate 1 and a copper plate 2 in the stage of joining the plates 1, 2. A heating plate 5 having high electrical resistance is attached between the plate 2 and a lower electrode 4 and an upper electrode 6 of an ordinary copper material is provided on the plate 1. The plates 1, 2 are pressurized by both electrodes 4, 6 of a resistance welding machine and electricity is conducted to the electrodes 4, 6 to heat and press weld the joint surfaces by the heate generated by the plate 5 and the heat generated by the resistance of the material 3. If the plate 5 and the press welding conditions are set, the always specified joint part is mechanically obtd. according to this method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for joining iron and copper, and more particularly, to a joining method that uses an inexpensive brazing filler metal to pressure-join them in a short time using a resistance welding machine.

[Prior art]

Conventionally, when joining iron and copper, it has been common to use silver solder, copper solder, etc., and braze with a burner, heating furnace, high frequency, etc., but this has the following drawbacks.

(1) Various brazing materials are used depending on the shape of the joint and usage conditions, but expensive silver brazing material is generally used.

(2) Most of the work is done manually, requires the skill of the operator, is not something that anyone can do, and is difficult to automate.

(3) There is a method called furnace brazing, but it requires an expensive furnace and long brazing takes time.

[Purpose of the invention]

The object of the present invention is to develop a method for obtaining high-quality iron-copper joints using an inexpensive brazing filler metal without requiring the skills of five workers, and in a stable operation at all times.

[Summary of the invention]

The feature of the present invention is that a resistance welding machine is used as a heating and pressurizing means, and a heating plate with high electrical resistance is attached between the electrode of the copper sword and the steel material. By increasing the temperature, pressure welding can be completed in a short time,
This is a method to obtain stable iron-copper bonded products.

[Embodiments of the invention]

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

FIG. 1 shows an example of joining an iron plate and a copper plate, in which an iron plate 1 and a copper plate 2 are stacked, a copper-phosphorus alloy foil 3 is sandwiched between them, and upper and lower electrodes are used to press and apply current. The lower electrode 4 located on the side of the copper plate 2 is attached with a heat generating plate 5 having high electrical resistance, and the upper electrode 6 of the iron plate 1 is a normal copper electrode. Copper is a material with extremely high electrical conductivity, making it difficult for resistance heat to concentrate, and the temperature required at the joint cannot be raised by energizing with a common copper electrode. When energized, this part generates heat to raise the temperature, and at the same time pressurizes it, making it possible to perform a complete pressure bond.

In addition, instead of using the heating plate 5, a material with a high resistance value or a powdery material with a high contact resistance is used as the brazing material.
Another option is to generate heat in the brazing material, but in this case, if one part of the brazing material melts first, all the current will be concentrated there, preventing the other parts of the brazing material from melting, making it impossible to make a perfect bond. The heating plate 5, which has a higher resistance than copper, also prevents current from concentrating on the melted portion of the foil 3, which is a brazing material, and also serves as a material for drawing materials 1.
This helps to uniformly raise the temperature of 2.

The energizing conditions necessary to uniformly raise the temperature of the art materials 1 and 2, melt the brazing material 3, and press them together are determined by selecting the appropriate material and thickness of the heating plate 5 and the type of the brazing material 3. It will be done.

The brazing filler metal 3 used is copper-phosphorus-based or tin-based, and may contain a small amount of a resistance heating material, so that the heating conditions can be adjusted by changing the electrical resistance of the brazing filler metal itself. Incidentally, the conventionally used silver solder is not necessary, and the amount of solder material can be reduced.

〔Effect of the invention〕

According to the present invention, whereas conventional joining methods require manual brazing using gas burners, etc., by setting the heating plate and pressure welding conditions, a constant joint can be mechanically obtained at all times. . Automated iron-copper joining is possible using an inexpensive brazing filler metal, which has a great effect on quality and economy.

[Brief explanation of drawings]

The figure is an explanatory diagram of a state in which an iron plate and a copper plate are pressure-joined by resistance heating. ■...Iron plate, 2...Copper plate, 3...Brazing metal, 4...
- Lower electrode, 5... heat generating plate, 6... upper electrode. Representative Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. In the method of joining iron and copper using a brazing material, a resistance welding machine is used as a heating and pressurizing means, and heat generation due to high electrical resistance is generated between the copper sword of the joining material and the electrode. A method of joining iron and copper using resistance heating, in which a plate is attached and the heat generated in this part when energized is concentrated on the joint surface, and combined with the heat generated by the resistance generated in the brazing material, the welding is completed in a short time. 2. A method for joining iron and copper by resistance heating according to claim 1, in which a copper-phosphorus-based or tin-based foil or paste material is sandwiched or applied as a brazing material.