JPS61165267A - Brazing method - Google Patents

Abstract

PURPOSE:To join satisfactorily joint parts without the outflow of a brazing filler metal, generation of voids, etc. by forming preliminarily the insert layers of the brazing filler metal to one or both of the joint surfaces of members, superposing the joint parts and heating the superposed parts to the melting temp. of the brazing filler metal or above. CONSTITUTION:The insert layers E1, E2 of the brazing filler metal are preliminarily formed on one or both surfaces to be joined of the metallic members A, B. After the joint parts are superposed, the joint parts are heated to the melting temp. of the brazing filler metal or above. The joint parts are then satisfactorily joined without the outflow of the brazing filler metal and without defects such as voids. The equally good result is obtd. even by disposing the brazing filler metal C to the end edge of the joint part to assure the stronger joint.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of soldering parts together. In particular, the present invention relates to a soldering method that allows reliable joining regardless of the soldering position.

(Prior art) Conventional brazing methods include: (1) After setting all of the brazing material at the ends of the parts to be joined, the brazing material is heated above its melting temperature and poured into the joining part of the parts. (2) A method in which a thin plate-shaped brazing material is entirely sandwiched between members and is heated to a temperature higher than the melting temperature of the brazing material to join the members.

(Problems to be Solved by the Invention) Looking at the method (1) above in Figure 2.3, tube A in gB?
This is a case of joining in the inserted state. It is necessary to maintain a gap between pipes A and B in order to fully pour the filler metal. The brazing filler metal C is set at the end of the joint. Is Fig. 2 a joining member? In the vertical position, FIG. 3 shows the state of soldering in the horizontal position. In the brazing process shown in Figure 2, it is difficult to create a knot in the gap into which the brazing material flows. If the gap is narrow, the solder will not flow in, or if the gap is too tight, the solder will flow out, resulting in poor joining, which is 6% more likely, and when joining pipes, it is also difficult to maintain a uniform gap over the entire joining surface. be. In the horizontal position shown in FIG. 3, in addition to the above-mentioned problems, since the solder tends to flow downward, the solder on the upper side falls down as it heats up, making it easy to cause joint failure.

In method (2) above, the method (2) involves placing thin T-scissors made of a brazing material between the joining members and brazing the joining parts by heating them. Generally, in order to maintain a high bonding strength, it is necessary to reduce the gap between the parts on the bonding surface, but since there is a limit to how thin a thin plate of brazing filler metal can be made, this method has problems in terms of bonding strength. there were.

(Means for Solving the Problems) In the present invention, when brazing parts together, an insert layer made of a material such as brazing filler metal is formed on one or both of the joint surfaces in advance, and the two After overlapping the parts with all joint surfaces,
This is a method of brazing by heating the joint. The insert layer is formed by plating or flow soldering. Placing a brazing metal at the end of the joint surface and replenishing the brazing metal? You can also.

(Function) When the parts to be joined are completely heated, the insert layer made of brazing material on the joint surface melts quickly, and the parts are integrally joined together.

When insert layers are formed on two components, the brazing material and the component form an alloy layer at the boundary during the insert layer formation stage, and are strongly bonded to the component and the insert layer. Although spreading 9 may occur, if the insert layers of the respective members are melted and integrated with each other, the purpose of joining will be achieved, and the joining will be reliable and can be easily performed in a short time.

(Example) The present invention will be described in detail according to the example shown in FIG.

The joint surface of gA, which is a joint member, is coated with inner-1 layer Lk by plating, pouring wax, etc. % Pipe B, which is another joint member
Insert layers Z2' are respectively preformed in the same manner on the bonding surfaces of the insert layers Z2'. Insert layer shape Ii′i, Tr
Either one of L may be used. Insert layer? The formed tube Ai is inserted into tube B, and the insert layer is set at a predetermined position. If necessary, a brazing material Oi can be placed at the end of the joint surface to replenish the brazing material. Thereafter, the joints were heated to a temperature higher than the melting temperature of the brazing filler metal to perform brazing, thereby joining the pipes A and B.

(Effect of the invention) The advantages of the present invention are as follows.

(1) Since the filler metal insert layer already exists, there is no need for a full gap for the filler metal to flow in, and the gap between the parts is minimized, and the filler metal spreads over the joint surface and fills the voids. Enables strong soldering without slipping.

(2) When forming the insert layer, the insert layer and the member are alloyed at the boundary, and the bond between the insert layer and the member is strong. When joining the members, the insert layers can be easily melted and integrated with each other.

(3) Since the insert layer of the brazing material is uniformly distributed on the joint surface in advance, there is no need to worry about the brazing material being washed away, and there is no need to consider the brazing position.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view showing an embodiment in which pipes are fully joined by the soldering method of the present invention, and Fig. 2.3 is an example in which pipes are joined by the conventional flow brazing method.
In the partially cutaway cross-sectional views shown, the bonding postures are vertical and horizontal, respectively. In the figure, A and B indicate tube members, C indicates a brazing filler metal, D indicates a gap between the joint surfaces of the members, and Fi1g2 indicates an insert layer of each member. Sub-agents 1) Meifuku agent Ryo Hagiwara -

Claims (1)

[Claims] In a method of brazing parts together, an insert layer made of a material such as solder is formed on one or both of the joint surfaces in advance, and then both parts are overlapped on the joint surface and heated to a temperature higher than the melting temperature of the brazing material. A brazing method characterized by: