JPS5835093A - Composite brazing material - Google Patents

Abstract

PURPOSE:To obtain a brazing material which can easily be made into a wire or plate even when plural metal elements lowering workability are contained, by mixing a metal or alloy, which has a melting point lower than that the external circumferential material of a high-melting-point metal or alloy so that the melting point decreases gradually toward the core. CONSTITUTION:For example, a cylinder made of is used as an external circumferential material, and a core material uses tin; and the core material of tin is intruded into the cylinder of copper and then extrusion and wire drawing are performed. When a metal or alloy having a melting point lower than that of the external circumferential material is used, the core material is never melted even when the external circumferential material is melted by external heat during brazing operation. Further, when the core material is heated up to the melting temperature, the external circumferential material is melted more than necessary to flow out to even parts other than a part to be brazed. For this purpose, the melting point is decreased gradually toward the core.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of brazing filler metals with poor workability.

Generally, brazing filler metals containing 8n, phosphorus, etc. are used to improve the flow of the filler and the strength of the filler wall, but if large amounts of these metal elements are added, the material becomes brittle. Therefore, it has poor workability and is difficult to form into wire or plate material. Furthermore, depending on the added elements, the types of materials to be soldered are limited in terms of brazing properties and strength of the solder wall.

The present invention was made in view of these circumstances, and even if it contains a large amount of metal elements that would have poor workability if made into an alloy material, it can be easily made into a wire or plate material. Furthermore, it is an object of the present invention to provide a brazing material that is not limited in the type of soldering material to be covered with it.

The brazing filler metal of the present invention will be explained below. First, a metal or alloy material with a high melting point is placed on the outer circumferential material, and a metal or alloy material with a low melting point is arranged on the outer circumferential material in parallel order approaching the core, and a composite material of at least two or more layers is arranged. It is made of brazing filler metal. The shape of this composite brazing material may be a single shape or a plate (in the case of a wire material, the wire diameter of the metal or alloy material that becomes the final core material must be 3 m or less, regardless of the total wire diameter of the composite brazing material). Even in the case of plate-shaped materials, it is desirable that the thickness of the metal or alloy material that becomes the final core material be 3 mm or less, regardless of the total plate 1v of the entire composite brazing material. be.

Here, the metal or alloy material that becomes the outer circumferential material and the core material may be arbitrarily selected from the viewpoints of the type of soldering material group to be covered and the required brazing strength, etc. In this case, the outer circumferential material has a higher melting point. It is only necessary to take care to make the structure high.
The same applies to the number of layers to be used, and the decision can be made in consideration of the brazing characteristics at the time of melting.

In addition, the structure in which a metal or alloy material with a high melting point is arranged on the outer circumferential material and a metal or alloy material with a lower melting point than the outer circumferential material is arranged in order as it approaches the core is because the composite brazing material is used for brazing work. In this case, if a metal or alloy material with a lower melting point than the core material is used for the outer material, the core material will not melt even if the outer material is melted by external heating, and the heating temperature will not be increased to the temperature at which the core material melts. If it is raised, the peripheral material that was melted first will melt more than necessary, and it will flow out to areas other than the parts to be brazed.

Therefore, it is necessary to make the outer circumferential material a metal or alloy material with a high melting point, and to make the core material t and the outer circumferential material sequentially also metals or alloy materials with a low melting point. Next, when the composite brazing material is made into a wire rod or plate material, the wire diameter of the metal or alloy material that becomes the final core material in the - material is 3W or less, and similarly in the case of the plate material, it becomes the final core material. Although the plate thickness of the metal or alloy material is 3W or less regardless of the total plate thickness, if each of these dimensions is 3M or more, the core may be heated before the outer material due to external heating during brazing work. This is because the wood will drain out of the bath and flow out. However, at 3u or less, even if the core material melts before the outer material due to surface tension and capillary phenomenon, it will not flow out, and when the outer material melts and begins to flow, the core material will also flow out, resulting in the desired state during brazing. It becomes a brazing filler metal with a composition of ingredients. Therefore, it is preferable that the metal or alloy material used as the final core material has a weight of 3 wa or less in each of the seven methods.

The composite brazing filler metal obtained in this way can be alloyed with other metal elements, even when using a metal element that would have poor VcFi processability if formed into an alloy material and cannot be formed into a wire or plate material. It suffices to use a single piece 11 without changing it, and therefore it can be easily processed and can be made into wire rods or plate materials.

Next, in order to further clarify the present invention, specific examples thereof will be described.

〔Example〕

A cylinder made of Cu was used as the outer circumferential material, and a core material of the fan was inserted into the Cu cylinder, followed by extrusion and wire drawing.
The total wire diameter is 2/m, the diameter of Sn in the core material is 054 mm, and the component composition when melted in a bath is Cu-30'W10 Sn.
A composite brazing filler metal of Cu and 8N was manufactured as follows.

Using the composite brazing filler metal obtained in this way, C2H2+
Using 02 gas, the brass pieces were torch-brazed. At the same time, a shear test was also conducted based on JI8Z3192 (shear test for brazed joints) using a No. 4 test piece specified by JI8''Z3194C brazed joint tensile and shear test piece) K, and the shear strength was It was about 29KF/-.

Next, using the Cu-30λ8n composite brazing filler metal 0.1f' made of the present invention as mentioned above, a spreading test was conducted based on JI8Z3191 (hard solder spreading test), and the spreadability was 7.2 to 7.2. 8. It was I CWI.

This has approximately the same spreadability as BAg-1 of JI8 Ag wax.

As a comparative example, a Cu-30vloS'' alloy was manufactured by a melting method in an attempt to obtain a wire rod of 2/sa, but the material was too brittle to form into a wire rod.

As explained in detail above, the composite brazing filler metal of the present invention can be used as a single metal even when using metal element tubes that would have poor workability when alloyed with other metal elements. , which can be easily processed and made into wire or plate material. Furthermore, the metal or alloy material of the outer circumferential material and the core material may be selected depending on the material of the covering brazing material group, and there is no restriction on the use of the brazing material depending on the material of the covering brazing material group.

Furthermore, the composite brazing material of the present invention needs to be heated at a temperature higher than the melting temperature of the outer circumferential material until the outer circumferential material melts, but after the outer circumferential material starts melting, the outer circumferential material and the core material are heated. Therefore, the heating temperature need only be lower than the melting temperature of the outer material, so it can be used as a brazing material with a relatively low melting point, and the combination of the outer material and the core material. This is made possible by ``Such a low MA
By using it as a brazing material, it is possible to save heat energy, shorten brazing work time, and prevent strength deterioration of the material to be soldered due to heat during heating. It can also be used as a step brazing material when performing.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (2)

[Claims] (1) A metal or alloy material with a high melting point is used as the outer cylinder material, and metals or alloy materials with a lower melting point than the outer peripheral material are arranged in order as they get closer to the core, and are composed of at least two layers of gold or alloy materials. Composite brazing material with 4K as a percentage image. (2) In the composite brazing material described in (1) above, if the shape is linear or plate-like, the dimensions of the metal or alloy material that will become the final core material are the diameter in the case of a linear material. A composite brazing material characterized by having a thickness of 3w or less, and a thickness of 3wa or less in the case of a plate material.