JPS6117375A - Method of welding different kind of metal to pipe material - Google Patents

Abstract

PURPOSE:To stick an Al pipe material fast to a member made of Fe by fitting a pipe material made of Fe inside of which is made rough to an unweldable pipe material such as Al etc. from outside, and after expanding from inside of the Al pipe or fastening from outside of the Fe pipe material, welding a member made of Fe to the Fe pipe material. CONSTITUTION:The pipe material made of Fe 3 inner face of which is roughened by forming minute unevenness using a cutting tool etc. is fitted to outer peripheral face of the pipe material 1 made of Al from outside. Then, inside expansion is made to press inner face of the pipe material made of Al 1 or the pipe material made of Fe 3 is pressed from outside by outside fastening and the Al pipe material 1 and Fe pipe material 3 are stuck strongly. Then, a supporting member 2 made of Fe of the same quality with the Fe pipe material is welded 5 to the Fe pipe material 3. Thus, the pipe material and supporting member made of unweldable Al and Fe can be stuck strongly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of welding dissimilar metals to a pipe material, which is used for attaching dissimilar metals to a pipe material by welding.

(Prior art and its problems) In automobile parts and other various uses, for example, non-ferrous metal pipes such as aluminum and supporting parts that maintain a predetermined strength by taking strong dissimilar metals such as iron and copper. It is often necessary to form a

Conventionally, in order to attach a steel support member to a pipe material such as aluminum as described above, as shown in Fig. 5, the end of the steel pipe material B is fitted and connected to the end of the aluminum pipe material A. The same type of iron 47C is welded to this iron pipe material 13 to form a support portion.

However, with the above-mentioned conventional means, it is extremely difficult to fit and connect the tube ends of optical metal tube materials with the necessary strength, and the process is complicated because diameter expansion and connection processing of the tube ends is required. There were drawbacks such as increased cost and increased cost.

[Purpose of the invention]

In view of this, the present invention provides a method for welding dissimilar metals to a pipe material made of a non-weldable metal such as aluminum, so that a weldable dissimilar metal such as iron can be easily attached to the pipe material made of a non-weldable metal such as aluminum. (Summary of the Invention) In order to achieve the above-mentioned object, the present invention is a method of forming minute irregularities on a surface in contact with a non-weldable pipe material such as aluminum. Weldable pipe materials with a rough surface are fitted together, and these pipe materials are expanded inwardly or externally tightened and pressurized to make them integral, and the same type of metal member is welded to the above-mentioned weldable pipe materials. It is characterized by the fact that it is made to do so.

(Embodiments of the invention) Embodiments of the present invention will be described below with reference to the drawings.

The embodiment shown in the figure shows a case in which a support member 2 made of iron is removed from the outer surface of an aluminum tube 1 by welding, and is fitted as tightly as possible to the outer circumferential surface of the aluminum tube 1. A short iron pipe material 3 having an inner diameter that can be adjusted is provided,
Minute irregularities 4 such as cutting scratches caused by a cutting tool are formed on the inner circumferential surface of the tube material 3, and the tube material 3 is fitted onto the aluminum tube material 1 at the position where the support member 2 is to be attached. Both are pressure-bonded and fixed by an internal expansion process that applies pressure to the surfaces or an external tightening process that applies pressure to the outer surface of the iron pipe material 3.

Next, by welding 5 and fixing the supporting member 2 made of the same kind of metal material to the circumferential surface of the iron pipe material 3,
A support member 2 made of a different metal is attached to the aluminum tube 1.
can be firmly attached by welding.

In addition, if the support member 2 is a pipe material and it is necessary to connect the inside to the inside of the aluminum pipe material 1, as shown in FIG. The holes 6 and 7 are drilled in advance, and the iron pipe material 3 is pressure-bonded to the aluminum pipe material 1 in the same manner as described above, and then the pipe material 2' is fitted into the iron pipe 4A3 to fit the holes 7.
By welding the parts, it is possible to install the parts so that the insides are connected.

In addition, when it is necessary to weld the support member 3 at multiple locations in the axial direction of the aluminum tube material 1, as shown in FIG.
．． 3', 3" are fitted, and each iron pipe material 3.3'3.
” It is possible to apply pressure welding by internally processing the parts at once.

〔Effect of the invention〕

As explained above, the present invention involves fitting a weldable pipe material with a roughened surface with minute irregularities on the surface in contact with a non-weldable pipe material such as aluminum, and expanding these pipe materials internally. Alternatively, by externally tightening and pressurizing and welding the same type of metal member to the above-mentioned weldable pipe material, it is possible to easily weld and cover the non-weldable pipe material such as aluminum with a metal member that can be welded. Moreover, there are various advantages such as there is no need to cut the base material side pipe material midway, it is much superior in terms of work compared to the conventional means of fitting and connecting metal pipe materials, and it is suitable for mass production. There is.

Note that the present invention is applicable not only to round pipes but also to cross-shaped pipes, and the material of the pipe material is not limited to the above embodiments.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a perspective view of the iron pipe material shown in Fig. 1, Fig. 3 is a longitudinal sectional side view showing a modification of the invention, and Fig. 4 is another example. FIG. 5 is a vertical side view showing a modification of the prior art. DESCRIPTION OF SYMBOLS 1... Aluminum pipe material, 2, 2'... Supporting member, 3... Iron pipe material, 4... Irregularities.

Claims (1)

[Claims] A weldable pipe material with a roughened surface is fitted with a non-weldable pipe material such as aluminum, and the surface in contact with the pipe material has minute irregularities.
A method for welding dissimilar metals to pipe materials, characterized in that these pipe materials are integrated by expanding inwardly or externally by pressurizing and welding the same type of metal member to the weldable pipe material.