JPS5910468A - Brazing method - Google Patents

Abstract

PURPOSE:To prevent the intrusion of impurities into brazed parts and to accomplish satisfactory brazing by tack welding the parts to be brazed by TIG welding from the side where a brazing material to be penetrated, then subjecting the parts to brazing thereby eliminating the need for any after treatment such as removal of flux in the tack welded parts. CONSTITUTION:Parts 1, 2, 3 which are held assembled and fixed by means of jigs 16 are tack welded at several places by TIG welding from the side A of the joining parts thereof where a brazing material is to be penetrated. The jigs 16 are removed, and the tack welded joining parts are brazed from the side A by using a brazing device. Since the TIG welding does not require any coating material and flux, there is no need for removing the slag and residual flux after the welding. The brazing is thus accomplished with high quality without deteriorating the quality in the brazed parts by the tack welding. Here, 17 in the figure denotes the frame body of the jigs 16, 18 a spacer, 20 a fastening means for fixing flanges 2, 3, and 21 a nut which is screwed to a bolt 19 and moves the means 20 forward or backward, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to brazing in which metals are joined using a solder. The brazing procedure can be roughly divided into three stages: pre-treatment, brazing, and post-treatment.

Pretreatment involves cleaning the parts to be brazed and
This is to assemble and fix the parts. In the second stage of brazing, the base material and the solder are heated by flame, heating furnace, high frequency, electric resistance, etc., and the parts are joined together.

The third stage of post-processing involves removing 7 lux from the brazing area.
Brazing, such as flashing, involves cleaning the part and other post-treatments. This invention relates to a method for assembling and fixing parts by brazing in pretreatment.

Now, when trying to fix the flange 2.3 to the bent pipe 1 as shown in Fig. 1 by brazing, it is necessary to perform the brazing work with these parts 1, 2.3 fixed to each other. I have to do it. Brazing is a conventionally known method for fixing components together, as shown in FIGS. 2 to 7.

The method using gravity shown in FIG. 2 uses the weight of the component 4 to fix the components 4 and 5 to each other, but this method is only applicable to components with simple shapes.

I can't do that. In the press-fitting method shown in FIG. 3, it is necessary to process the fitting portions 8 of the parts 6 and 7 with high precision, and there is also a problem in penetration of the solder into the fitting portions 8. Fourth
The swaging method shown in the figure and the tube expansion method shown in FIG. 5 require swaging and tube expansion, respectively, and are also subject to restrictions on the shape of the joints between the parts 9, 10 or 11, 12. Is it the sensai soup H1r shown in Figure 6? ) Brazing is a method of temporarily joining parts 13 and 14 by arc welding or the like on the opposite side B of fullll A, which penetrates the materials, and prevents spatter and other substances harmful to brazing generated during welding from entering the joint 15. In order to avoid intrusion, temporary attachment is performed from the opposite side B, but it is still impossible to completely prevent harmful substances from entering the joint 15. Due to the temporary attachment system, there are restrictions on the shape of the joints of parts 13 and 14, and there is a step on the inner diameter surface of the joint between the end of the curved pipe 1 and the flange 2.3, as shown in Figure 1. If MI[l<, is intentionally adopted, post-processing such as removal of beats in the tacking section will be required. Therefore, when assembling parts as shown in Fig. 1 by brazing, the fixing method is to braze while fixing parts 1゜2.3 with a jig 16 as shown in Fig. 7. I had no choice but to adopt this method.

Here, in FIG. 7, 17 is the frame of the jig 16, 18 is a spacer, 19 is a bolt implanted in the frame 17, 20 is a fastener for fixing the 7 flanges 2 and 3, and 21 is a This is a nut that is screwed onto the bolt 19 to move the fastener 20 forward and backward.

8 and 9 show an example of a heating device for brazing, where 22 is a workpiece, 23 is a heating burner, 24 is a source adjustment valve, 25 is a gas hose, and 26 is a stand that holds the heating burner 23. So, inner stun l' 26
The mechanism is such that the heating burner 23 can be raised and lowered by means of a. Reference numeral 27 denotes a heating gas intake section from outside the machine, which is provided with a source solenoid valve, a bypass solenoid valve, and the like. Reference numeral 28 denotes an operation box containing control equipment for performing a series of operations for moving the heating burner 23, igniting and extinguishing the fire, and operating the emergency stop ring. 29 is the frame of the apparatus which is brazed, and a rail 30 is provided on the upper part, and the trolley 31 is attached to the rail 30.
is installed so that it can run freely, and stand 2 is mounted on this trolley 31''.
6. Gas intake part 27 etc. are installed. 32 is a workbench, and the workpiece 22 set with a clamp jig 33 is brazed to the workbench 32-. Figures 1 and 7 are diagrams showing the state in which the heating burner 23 is retracted. During brazing, the heating burner 23 moves to the position 23a shown by the imaginary line in the figure and heats the workpiece 22. It has become.

When such brazing is performed using a heating device, if the workpiece 22 remains fixed to the jig 16 as shown in FIG. 7, the workability will deteriorate and be inefficient. In the case of a double-shaped jig, the heating burner 23
The heating burner 23 may have to be replaced with one that matches the shape of the jig 16, and depending on the shape of the jig, the heating burner 23
It becomes difficult for the flame to uniformly heat the parts of the work 22 during brazing, resulting in quality defects.

In this way, when trying to process the parts shown in Figure 1 by brazing, the conventional fixing methods shown in Figures 2 to 7 all have their drawbacks and are difficult to work with, as well as in terms of quality. There are also problems in terms of cost.

The present invention was made with the aim of solving the drawbacks of the conventional parts fixing method when soldering, and to provide a fixing method with better workability.
[Ke1. Top-1)-Susho? (-J left, J- brazing is tack-fixed by TIG welding (tungsten arc welding in an inert gas atmosphere) from the side where the metal is penetrated, and then the brazing is processed. be.

To further explain this based on FIG. 7, parts 1 and 2
．． 3 are assembled and fixed using the jig 16, and the joints are temporarily welded at several locations by TTG welding from the side A where the material is to be penetrated. In the brazing shown, the joints that have been tacked using a device are brazed from the side A where the brazing material penetrates.

Since TIG welding does not require coating materials or flux, there is no need to remove slag or residual flux after welding. Also, the mechanical properties of the weld metal are generally better than other arc welding methods.

Using TIG welding with such properties, the joint M
Z; /-l・r-to 1-1? -5-m
',yh Jp LL 7 /IHI Yu,
-IC: JJ 7■-? If the parts are fixed to each other with Since the brazing process is extremely good and the brazing process can be carried out efficiently, the temporary welding is performed from the side where the filler metal penetrates, so brazing can be performed on parts of any shape without being restricted by the shape of the part. An excellent effect can be obtained in that they can also be fixed to each other.

The effects of the fixing method of the present invention will be specifically described in comparison with conventional fixing methods as follows.

When compared to the method of brazing while fixed with a jig, (1) Fewer jigs are required.

(2) Brazing makes it easy to set the work into the equipment.

(3) Variations in assembly dimensions due to thermal deformation of the jig can be avoided.

(4) Brazing simplifies the shape of the device's heating burner and heating coil, and is required for mounting and removing the heating burner and coil]
- Decrease in numbers.

(5) During brazing, it is easy to uniformly heat the parts, and high quality soldering parts can be obtained.

When compared with the conventional welding plate tension method, (1) Temporary tension 1
There is no need for post-treatment such as removing flux from the exposed areas.

(2) Good brazing can be achieved without impurities entering the parts.

(3) No restrictions on the shape of the joints between parts (
, all brazing can be applied in places.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of parts assembled by brazing, FIGS. 2 to 7 are diagrams showing a conventional fixing structure of parts when brazing is used, and FIGS. 8 and 9 are diagrams showing an example of parts assembled by brazing. It is a figure showing an example of a single heating device. Agent: Patent Attorney Takao NishiFigure 5Figure 6

Claims (1)

[Claims] (1) The parts to be brazed are temporarily fixed by TIG welding from the side where the material is to be penetrated,
Brazing is a method characterized by infiltrating the material into the joint from the tacked side.