JPS59229278A - Joining method of brazing surfaces - Google Patents

Abstract

PURPOSE:To eliminate gaps and defects and to prevent leakage by providing preliminarily a linear ultrasonic seam weld line on the brazing surfaces of members. CONSTITUTION:A brazing material-clad sheet 2 which is preliminarily clad with a brazing filler metal is used for at least one of the surfaces of members requiring brazing or a foil 5 of the brazing filler metal is inserted between the opposed surfaces of both members. Both members are excitated ultrasonically in a prescribed position and are subjected to continuous linear seam welding 8 (weld width Wmu), by which the members are tack-welded. The tack-welded members are heated in a brazing furnace to melt the brazing filler metal 4 or the foil 5 and thereafter the members are cooled to solidify the molten brazing filler metal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining solder surfaces. More specifically, the present invention relates to a method for seam brazing aluminum.

Fig. 1 shows an example of a conventional brazing method for surface joining of aluminum. 60) is an example of a member combination, ←) is another example, (c) is an overlapping state for temporary assembly, )
1 shows the state after brazing, and (E) shows the brazing defect state in the 1-1 arrow plane. In Fig. 1, 1 is the base material, 2 is the brazing metal clad plate, and 5 is the core material (base material). 4 is a brazing material layer, 5 is a brazing material foil, 6 is a solidified brazing material, and 7 is a defect (such as a soldering cine, a pinhole, or a shrinkage hole).

In the original form of brazing, linear bonding is preferable, and when it comes to surface bonding, prevention of brazing defects is said to be unavoidable in reality. In particular, the recent trend has been to avoid flux brazing (although it is good for the flow of molten solder) from the standpoint of non-pollution, and vacuum brazing and atmosphere brazing have become popular.
Brazing defects tend to occur more often than with flux brazing. Therefore, it is actually difficult to apply solder joints at the seams of containers, pipes, etc. where fluid leakage cannot be tolerated, or repairs are performed in the post-process. Since there are many components such as containers and pipes that require surface bonding by bonding, there is a need to develop and establish a brazing technology that is leak-free and has high pressure resistance. In order to meet such demands, there are limits to improvements and improvements made solely by brazing technology, and therefore research has been conducted to solve the problem using composite processing technology, and the present invention has been completed. That is, the present invention involves linear ultrasonic bonding of two or more aluminum or aluminum alloy thin plates, with an At-8i brazing filler metal layer or the like cladding or interposed on at least one of the stacked surfaces. The present invention relates to a brazing surface bonding method which is characterized in that the brazing material layer is then melted, infiltrated, and solidified to join the overlapping surfaces.

The method of the present invention is suitable for producing aluminum brazed bamboo products, such as aluminum pipes used for air conditioners, heat exchangers, and the like.

Next, the method of the present invention will be explained with reference to FIGS. 2 to 4.

FIG. 2L shows a principle diagram of the brazing method according to the present invention, (
B) is an example of a combination of parts, Q: I) is the other side, (C) is the state of the brazing curves that were ultrasonically welded in a linear shape after stacking, B) the state of the brazed parts, N) Hani) A ■-■ arrow view is shown.

FIG. 3 shows an example of a refrigerant pipe used in a car air conditioner or the like as a specific application example using the method of the present invention. Figure 4 1
5 shows other embodiments of the same refrigerant pipe @ In Figures 2 to 4, 1 to 7 are the same as in Figure 1, 8 is the ultrasonic seam weld, 9 is the tube outer circumference material, and 10 is the pipe hem. Department,
11 is a folded part, 12 is a corrugated plate, 13 is an end of the corrugated plate, 14
15 is the number of parts of the seam wax, 15 is the pipe completed by the method of the present invention,
Nu indicates the ultrasonic welding width and VB indicates the width of the fissure bone without defects, respectively.

In Fig. 2, a brazing metal clad sheet 2 [
[Fig. 00]] or insert a waxing foil 5 between the opposing surfaces of both members [← in the figure].

Next, at a predetermined position, both members are subjected to ultrasonic vibration, and continuous linear seam welding (welding width Wu) is performed to temporarily attach the members [FIG. (C)]. The temporarily joined members are heated in a brazing furnace to melt the brazing material 4 or the brazing material foil 5, and then cooled and solidified.

FIG. 3 shows an example of a refrigerant pipe in which the method of the present invention is used in a car air conditioner or the like.

In FIG. 5, both end portions 13 of the corrugated plate are aligned and overlapped with the 9th part 10 and the nose folded part 11 of the upper and lower tube materials 9 [0 in the figure]. In this case, a brazing material 4 or a brazing material foil 5 is provided in advance on the surfaces of the tube material and the corrugated sheet that require soldering.

After bending and caulking the nose-folded part 11 to the edge part 10 of the other side, each of the nine folds is subjected to linear ultrasonic welding (welding width Wu) of at least one line along the entire length of the pipe in the weight section.
Do the following. At this time, if necessary, the pipe may be meandered and external members such as fins may be mounted. The component is then heated in a brazing furnace to form a brazing material 4 or a brazing material foil 5.
The finished product is obtained by melting and solidifying and joining each member.

FIG. 4 shows another example of producing a refrigerant pipe.

In FIG. 4, tube materials 9 having symmetrical helical portions 10 at both ends are opposed, and a corrugated plate having both end portions 15 is inserted and overlapped in between ((1) in the figure). In this case, at least a soldering material 4 or a soldering material foil 5 is previously provided on the surfaces of the tube material and the corrugated sheet that require soldering. In this state, both end hem portions 107 corrugated plate both end portions 137 both end hem portions 10
At least one line of ultrasonic bonding is performed on the zero overlap portion over the entire length of the tube. At this time, if necessary, the pipe is meandered, and furthermore, external members such as fins are mounted.Then, all of the above members are heated in a brazing furnace, and the brazing material 4 or brazing material foil 5' i Melting and solidifying the parts and assembling them to obtain a finished product O The effects of the method of the present invention are listed as follows.

(1) As shown in Fig. 2 f, by providing a linear ultrasonic seam welding line 8 in advance on the soldering surface of the component,
Since the region of width Nu has zero gaps and no defects, leakage can be prevented in this region in the worst case.

(2) In Fig. 2 &-1, the brazing material is completely filled in the brazed part in the part where there is a slight gap adjacent to Wu, and as shown in Fig. 2), the area of WB is This can prevent leakage if the solder area is defective. This slight gap usually has a value of 0.1 fi or less when performing vacuum soldering, and a value of 0.2 ram or less when performing flux soldering. Although brazing defects will occur in areas larger than the above-mentioned gap, since the brazing material is rotating, it contributes to improving the strength of the brazed surface.

By the effects of (1) and (2) above, it is possible to satisfy both the functions of preventing fluid leakage and improving strength such as pressure resistance.

(3) As shown in Fig. 3 (b), by providing the ultrasonic seam welding part 8, it is possible to prevent the opening of the folded part 11 at the bending part when the pipe is meanderingly bent, so that brazing can be completed completely. It can be constructed.

(4) As shown in FIG. 4(B), by providing the ultrasonic seam welding part 8, three members, that is, the pipe outer circumferential material 9/corrugated plate 12/pipe outer circumferential material 9 can be combined, so that the next step Material handling during processing such as bending can be done easily and accurately.

[Brief explanation of the drawing]

Fig. 1 shows a conventional brazing method for surface bonding of aluminum, Fig. 2 shows a principle diagram of a brazing method according to the present invention, and Figs. An example will be shown in which the method of the invention is applied to the production of refrigerant pipes. Sub-agents 1) Akihiro's agent Ryo Hagiwara - Figure 1 (e) Figure 2-w8-1 Figure 4

Claims (1)

[Claims] At least one of the overlapped surfaces of two or more thin plate members has a brazing metal cladding layer or a brazing metal foil is inserted therein, and after linear ultrasonic welding, the brazing metal is melted, A solder joint method characterized by joining overlapping surfaces by penetration and solidification.