JPS63171274A - Method for welding aluminum member and copper member by tig welding - Google Patents

Abstract

PURPOSE:To enable to weld without removing the oxidized film of an Al base metal and to safely weld with good workability by performing a TIG welding by using the filler metal of a phosphor copper solder on a copper member to the Al base metal. CONSTITUTION:An U-shaped groove 2 is formed on the periphery of an A base metal 1 to weld the copper member 3 consisting of an annealed copper made water jet pipe inside the U-shape groove 2. In this case a preheating is applied on the filler metal in the wire shape of a phosphor copper solder by the flame of an acetylene gas burner to actuate a TIG welding machine in DC and on the stabilization of the arc thereof the filler metal of the phosphor copper solder is melted to continuously weld the copper number 3 to the base metal 1 at joining parts 6, 7. The joining part is thus uniformly welded to perform the joining having good heat conductivity.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of welding an aluminum member and a copper member by TIG welding, which is suitable for attaching a copper member such as a steel pipe to an aluminum part that mainly constitutes a vacuum device.

(Prior Art) Conventionally, a water flow pipe has been attached to the aluminum parts of vacuum equipment, such as the aluminum door of a vacuum chamber, and the door has been configured so that it can be cooled with a cooling liquid flowing through the water flow pipe. . In this case, the water flow pipe may be made of aluminum and soldered together like the door, or the water flow pipe may be made of copper and attached to an aluminum door in order to facilitate the joining of the pipe joint to the water flow pipe and to increase cooling efficiency. Attempts were made to solder the two aluminum parts together, but in the case of the former aluminum parts, the oxide film on the surface of the base material of the aluminum door was so strong that it could not be completely removed with flux. If this is done, the aluminum water flow tube will melt due to the arc, making it impossible to bond uniformly.

In addition, when brazing a copper water flow pipe to the latter aluminum door, acetylene preheats the copper water flow pipe with the flame of the svarna, so an oxide film is formed on its surface, and this film and the aluminum oxide film on the surface of the base material are To remove it, cadmium is used, which is extremely harmful to the human body and difficult to solder.

Therefore, at present, as shown in the first diagram, aluminum l1f
Either process a U groove on the surface of the base material a of i, fit the copper water flow tube C therein, and then fasten it with a metal fitting d, or, as shown in the second diagram, attach a copper water flow pipe to the aluminum base material a with a metal fitting d. A method is adopted in which after fixing with a water flow pipe C, adhesive f is poured into the adhesive part e.

(Problems to be Solved by the Invention) As shown in the first diagram, when the water control flow pipe C is provided in the U-groove of the aluminum base material a and is held down by the metal fitting d, the base material a and the pipe C are uniformly distributed. This is not desirable because it does not adhere closely, reduces cooling efficiency, and increases processing costs. Furthermore, as shown in the second figure, the material bonded with adhesive f has disadvantages such as being highly harmful to the human body like cadmium, having poor workability, and poor cooling efficiency.

The purpose of the present invention is to eliminate the drawbacks associated with joining aluminum uke base materials and copper members using conventional techniques, and to propose a joining method that is simple, inexpensive, non-hazardous, and has good thermal conductivity. .

(Means for Solving the Problems) In the present invention, the above-mentioned problems are solved by melting and joining the aluminum base material and the copper member to be welded thereto by TIG welding as a phosphor copper filler metal. I made it.

(Function) A copper member such as a copper water flow pipe is arranged in a predetermined form on the aluminum base material to be welded, and the surface of the base material is degreased and cleaned, and an oxide film is formed on the surface of the base material. Preheat evenly with the flame of an acetylene gas burner. When the temperature of the base material reaches a predetermined temperature, the TIG welding machine is activated,
While utilizing the upslope control, high-speed welding is performed by melting phosphorous copper solder as a filler metal using a direct current arc. According to this, even if the oxide film on the aluminum base material is strong, or even if the surface of the copper component is oxidized at high temperature due to the flame and arc heat of an acetylene gas burner, phosphorous copper solder will not damage the base material and copper component. It has good adhesion and can uniformly weld the base material and copper parts, making it possible to join with good thermal conductivity.

(Example) An embodiment of the present invention will be described based on FIGS. 3 and 4.

Figure 3 shows an example of manufacturing a vacuum equipment part that cools grooves (4) and (5) formed in the aluminum base material using copper water flow tubes. A copper member (3) forming a U*(2) and consisting of an annealed copper water flow tube is welded into the U groove (h. Specifically, the thickness t of the base material (1) 15#III with a diameter of 350 m, a copper member (3) with a wall thickness of 1.2 mm and a diameter of IQm is welded into the groove (2) with a radius of 5 ms + (7) Ll, but in this case, the diameter is 2 Prepare a wire-shaped phosphorus-copper filler metal, preheat it with the flame of an acetylene gas burner, operate a TIG welder with direct current, and when the arc stabilizes, melt the phosphorus-copper filler metal, and The copper member (3) is continuously welded to the material (1) at the joint (ω(7). Phosphorous copper solder is used as a filler material for welding the aluminum base material (1) and the copper member (3), and TIG Welding with direct current from a welding machine results in relatively good soldering, and even if a strong oxide film is formed on the surface of the base metal (1), the surface of the copper member (3) will be damaged by preheating and arc heat. Since welding can be performed even when the ml is increased, the joint can be welded uniformly and the joint can have good thermal conductivity.

In the aluminum base material (1) shown in the third figure, the copper member (3) has a diameter of 88 mm and a thickness of 1.0 mm. In this case, the R of the U groove (2) is 4jQl, and in this case the diameter is 1
．． A 6 m wire filler metal was used and the copper member (
When 3) has a diameter of 12a* and a thickness of 1.2m, the radius of the U groove (2) is 6111, and a wire-shaped filler metal with a diameter of 2.4M is used.

The embodiment shown in the fourth figure is a copper member (3) consisting of a cooling water flow pipe for cooling grooves (8) (9) of a plate-shaped aluminum base material (1) constituting the door of a vacuum chamber. In this case, the thickness t is 15al and the width W is 500mm. ,
A diameter of 10 m5 is placed on the plate surface of the base material (1) with a length l of 500 m+.
Wall thickness 1.2. Layer the copper members (3) of 2.0#II in diameter.
Using the wire-shaped filler metal I, staggered welding was performed on the joint aO using a TIG welder direct current. In this case as well, the joint between the base material (1) and the copper member (3) is uniformly welded as in the case shown in the third figure, and has good thermal conductivity and can improve cooling efficiency. Member (3) can be attached.

(Effects of the Invention) As described above, according to the present invention, a copper member such as a water control flow pipe is joined to an aluminum base material by TIG welding using filler metal of phosphorous copper solder. It can be welded without removing the oxide film of the base metal, and even if the surface of copper parts is oxidized by heating, it can be welded as is, it is non-hazardous and can be safely welded, and it can be joined without the need for mounting hardware. Therefore, workability is good,
Since the joint is uniformly welded, the thermal conductivity is improved, and this has the advantage that it can be conveniently applied to vacuum equipment that requires increased cooling efficiency.

[Brief explanation of the drawing]

1 and 2 are perspective views showing an example of joining an aluminum base material and a copper member in conventional vacuum equipment, FIG. 3 is a partially cutaway perspective view of an embodiment of the present invention, and FIG. FIG. 3 is a perspective view of another embodiment of the invention.

Claims (1)

[Claims] A method for welding an aluminum member and a copper member by Teig welding, characterized in that an aluminum base material and a copper member to be welded thereto are joined by Teig welding by melting phosphorous copper solder as a filler material.