JPS59220281A - Brazing and joining method of metallic body - Google Patents

Abstract

PURPOSE:To prevent generation of a defective joint zone and to obtain high joint strength by forming slits having open ports opening to the side end edge of a metallic body on at least one of the joint surfaces of the metallic body to be joined. CONSTITUTION:Slits 3 are formed on a joint surface 2 in the case of joining metallic bodies 1 by a joint. The slits 3 are such linear hollow grooves having open ports 5 opening to the side edge end 4 of the bodies 1, for example to the side face A corresponding to the cut end surface in the case of, for example, a disc material at >=1 point. The joint surfaces of the metallic bodies formed with the slits 3 on at least one of the joint surfaces are placed to face each other with a solder material in-between and are joined by brazing in accordance with the conventional method. The gas between the joint surfaces is thus thoroughly expelled to the outside in the stage of brazing and is no more confined therein and therefore the joint part joined firmly to a wide joint area is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bonding a metal body to a metal body, which can form a bonded portion having a large bonding area and having strong fistula bonding strength.

There are various methods for joining metal bodies, such as simple formed materials such as plates and shapes, and complex shapes preformed by casting, forging, etc., but brazing is used in many sectors. There is. However, for L7, the joining temperature for brazing is 420
It can be classified into various methods, such as a brazing method using a hard soldering material at temperatures above 420° C., a soldering method using a soft soldering material at a temperature below 420° C., a method using flux, or a method using 7 lux.

That is, for example, by soldering method 1. Antimony-lead based and tin-zinc based alloy semi-11.1 is used as a soft solder I7 to join various metal materials.

In this case, a soft soldering flux such as an inorganic flux mainly containing tin chloride or zinc chloride or an organic flux using triethanolamine or the like is used.

In addition, by brazing method, 1. phosphorus copper.

Brass wax, silver wax, copper wax9. Aluminum wax.

Fluxes mainly composed of nickel solder, soft brazing filler metal, and if desired, powder sand and boric acid, to which borofluoride is added, sodium chloride-lithium chloride-potassium chloride-based fluxes, or fluorinated cum-aluminum fluoride-based fluxes, etc. The flux is heated to a predetermined temperature to perform the bonding.

In this way, both the soldering method and the brazing method are equivalent techniques in that a brazing material is interposed between joined metal bodies, and are preferably used in the assembly of small parts. In addition, the joint rod type has a point-like or linear joint structure such as a butt joint or a lap joint.
9 Utilizes gravity and capillary action [7 The soldering material is diffused into the gap between the joints to join, but the amount of time required for this is usually only a few questions, and at most 1.5 to 3 rTn. This was not a so-called surface bond, and a poor bonding zone was likely to occur inside the bonded portion. That is, for example.

3. The spreadability of the brazing filler metal in chloride-based slacks between aluminum alloy discs with a diameter of 16 to 18 rrn.
~4 times better! (! When brazing in a furnace using a fluoride-based franks that exhibits properties of There is a tendency for the number of poor bonding zones to increase.Also.

When joining a combination of dissimilar metal materials, such as aluminum and stainless steel, even if they have the same diameter.

The rate of occurrence of poor bonding bands tends to increase even further, and when an aluminum material with a diameter of 45z and a stainless steel phase are brazed, the defective bonding zones can reach as much as 60%. Therefore, when it is necessary to form a wide joint 1ff1, casting methods and pressure welding methods are often used. 11 Strong bonding strength due to reliability
) Yotsuni/li! j row 1. ? ! ) was running out of means.

The inventors have conducted repeated research to solve this problem, and
Bond failure zones often occur in the center of the joint, and are mainly caused by the fact that the wetting and spreading properties of the solder using flux, which are commonly used in the past, are not very good, and the gas between the joint surfaces completely escapes to the outside during soldering. Recognizing that the problem is caused by the metal being trapped without being expelled, and further recognizing that the purpose can be achieved by making a cut in the joint surface of the metal body that opens at the side edge of the metal body and joining it. This invention is a seventh aspect of the present invention. That is, when joining metal bodies by brazing, a cut having one or more openings opening at the fill N end of the metal body is formed on the joint surface of the metal body. Formed on at least one joint surface.

This is a brazing method for joining metal objects.

The metal body used in the present invention is not particularly limited, and the materials include, for example, steel,
Steel materials, aluminum materials and other conventional metal F-suitable materials,
These products of the same type or different types can be used in appropriate combinations, and as long as they can be fixed with a brazing jig, the product type or its external shape can be a plate side such as a circular plate or a rectangular plate, or an extruded type. It may be a pre-formed material such as molded material or a divided pre-formed material with a complicated circular shape manufactured by various forming methods such as casting, die casting, and forging. may be something like a continuously rolled plate.

Next, as shown in FIGS. 1 to 3, incisions (3
) kl, the lateral line end (4) of the gold body - For example, in the case of the disc side as shown in Figure 1, the side surface (A) corresponding to the cut surface
- A linear concave groove having at least two or more convenient hooks with an open opening (5) that opens at the end of the groove.For example, as shown in FIG.

In a plate material, a concave groove that penetrates from the negative side (B) to the other side (C), for example, a plurality of parallel lines at predetermined intervals, an X-shape, as shown in FIGS. Figure 1 (C)
, Figure 2 (d), etc.], #-shaped [Figure 1 (b), Era 2
(Fig. 1 (c), etc.) (including slanted shapes with an angle to each of them) or radial form (Fig. 1 (c), etc.)
Cd), etc.] or, in the case of forming it on each joint surface (2) of the metal body (1) as shown in FIG. 3, on the joint surface (2) of one (1').

Parallel linear cuts that are alternately formed to have open openings (5) only on one side edge (as shown in FIGS. 1(e) and (f)) or cuts that do not open to the side edge, for example 9
Even when a concentric cut (3) is formed in the disk, a cut (3) with open openings (5) opening on both side edges is formed on the joint surface ('2'') of the other metal body (Y'). This can be made to intersect with this, or a combination of these as appropriate.

The cross-sectional shape of the cut is wedge-shaped, rectangular, or semicircular.

An appropriate shape such as a dovetail shape may be used. The depth and width of the cut can be selected appropriately depending on the thickness of the metal body, the joint area, the number of cuts to be formed, etc., but it is better to make the cut as small as possible to ensure the soundness of the joint. From the top, it looks good. Normally, it is preferable that both the depth and the width be 1 tan or less. For example, in the case of a board with a thickness of 1 bait, the thickness is 0.4 ttan.
It is preferable to have a wedge shape or a rectangular shape with a depth of about 0.2 mm. Also, the number of notches or their spacing is
It is determined by considering the width of the bonding area and the wettability of the brazing filler metal. For example, when trying to maximize the bonding effect between aluminum materials by using an aluminum alloy brazing filler metal, When using physical flux, the distance between adjacent cuts is 5 to 6 rrn.
It is preferable to set it to the following, and when using a fluoride flux, it can be expanded to about 13 to 15 cnI.

Accordingly, the formation of the notch can be carried out by an appropriate cutting means such as a keki, a lathe, etc. depending on the hardness characteristics and shape of the whole frame itself.

Next, the metal body having the above-mentioned notch formed on at least one of the joint surfaces is bonded to the solder bone at 111° in the usual manner, with a brazing material sandwiched between the joint surface and the opposite surface.

During brazing (if desired, use appropriate brazing equipment such as vacuum brazing, inert atmosphere furnace, high frequency brazing furnace, etc., and use brazing material and flux according to the metal material of the products to be joined. It is selected from those commonly used, and the brazing conditions such as the brazing temperature of 9 hours can be the same as the conventionally applicable conditions.In other words,
For example, in the case of furnace brazing using flux.

Surface purification treatment such as degreasing and pickling treatment to remove oxide film is performed on the joint surfaces of the metal bodies, and the metal bodies are assembled in a jig by sandwiching the solder metal plate, which has been coated with flux on both sides, in the middle. The material is then brought into a brazing furnace heated to the brazing temperature and brazed. For example, when the metal bodies are aluminum materials or aluminum and stainless steel materials, solder bone bonding is performed in a nitrogen gas atmosphere furnace at about 60°C using an aluminum alloy brazing material and chloride-based or fluoride-based flux. is performed + primary, in the case of steel materials or steel materials and stainless steel materials, silver solder,
800℃ using brazing metal such as brass and chloride flux
It is hammered in a non-oxidizing atmosphere furnace before and after.

For example, when brazing metal objects with complex shapes that have been semi-formed by casting or forging, it is important to avoid bonding defects due to differences in temperature rise and cooling rates between thick and thin parts. Consideration for outbreaks.

Alternatively, it is preferable that the joint surface of the metal object be kept horizontal in the brazing furnace, but it is unavoidable that the joint surface be vertical due to the relationship between the product shape and the structure of the furnace used. In this case, the shape of the cut that can be formed on the joint surface is formed in the furnace so that the cut is parallel to the horizontal plane and held with a jig.For those whose joint surface is approximately cylindrical, It goes without saying that it is preferable to take appropriate precautions, such as performing brazing while rotating the metal body.

Note that the method of the present invention is applicable not only when joining metal bodies into two layers, but also when joining three or more layers, and by forming the above-mentioned incisions on at least one surface of the mutually joined parts. 1. All you have to do is perform a teleosteosynthesis.

The metal body that has been soldered in this way is preformed into parts by casting or forging.

It can be made into a product by joining, but in the case of plate materials.

It is possible to perform post-processing such as press processing as appropriate, and can be used for panel materials for various purposes, household utensils, automobile parts,
It can be used as a product for various uses such as parts for electronic devices.

In the present invention, a notch is formed on at least one of the joining surfaces of the metal body, and has one or more openings that reach the side edges of the metal body.1. hand.

The conditions for brazing as we decided to perform a brazing bone joint.

Even if a very limited special flux or wax with excellent wetting and spreading properties is used without changing the equipment, it is difficult to weld surfaces with a bond length of 3 m or more. For example, one side is 10
Even with a wide area of about 0/7F1 square, it is possible to achieve the same bonding strength as wire brazing, and when joining different types of brazing materials, the wettability of the brazing filler metal and flux differs depending on the material of the metal body. It is possible to obtain the same bonding strength between H materials, and to use a low melting point reactive semi-U1 solder such as soldering or stainless steel compatible with it, which was more difficult due to the It is also applicable to cases where the surface brazing properties possible with soldering can be significantly improved, and even when the bonding surface is 3rnr or less, the bonding strength can be increased by narrowing the interval between the notches. Many excellent effects have been recognized, such as being able to achieve better results than before.

Next, an example will be described.

Example 200 mm, 1 side thickness SUS 430 stainless steel disk 5
6 lines 0.2 mrn deep, passed through the center point and at an angle of 30° to each other on one side of each disk.
A rectangular incision with a diameter of 0.5 mm was made, and the incision was degreased and cleaned with trichloroethane.

On the other hand, 350 ranf; , 5 2.5 mm thick 28 aluminum alloy disks were used, and each disk was washed with sodium hydroxide to remove the oxide film and 200 ranf. Five sheets of A4045 alloy brazing filler metal with a thickness of 0.15 cm were used, and 43wt of potassium 7) chloride was applied to both sides of each filler metal in terms of single compound.

H, 10 wt of fluoride flux consisting of 57 wt.% aluminum fluoride, % fluoroaluminate.

Apply Chislurry with a brush (and let it dry).

After the preliminary treatment 4) was assembled and fixed in the order of 1st aluminum, soldering material and stainless steel using a jig, a set of belt conveyors were placed in a continuous 9-pass furnace under a nitrogen gas atmosphere. The materials were brought in and brazed joints were carried out by moving them through a furnace while holding the surfaces to be joined horizontally and heating them at 600.degree. C. for 2 minutes.

Each of the sloped brazed joints A was subjected to an X-ray fluoroscopic inspection and a joint strength test. The results showed that the proportion of defective joint bands was less than 5 inches in all cases, the variation in strength was small, and the reliability of the soldered portion was excellent.

Comparative Example The stainless steel disk was used in the same manner as in the example except that the stainless steel disk was used without forming a cut.

As a result of similar inspection and testing, 40% of the joints were defective.
In addition to the above-mentioned problems, the reliability of the soldered joints was lacking due to their strength (large irregularities).

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating the formation state of cuts in a disc and a square plate according to the present invention, and FIG. A plan view illustrating the formation state of the long cut in the present invention in a metal body such as a continuous pressure plate,
FIG. 3 is a perspective view illustrating the case where cuts are formed on both sides of the metal body.

Claims (1)

[Claims] 1) When joining metal bodies by brazing, a notch having one or more open openings that opens at the side edges of the metal body is formed on at least one of the joint surfaces of the metal body, and the metal body is joined by brazing. 1. A method for joining a metal body with a wax bone, characterized by joining the metal body.