JP3148494B2 - Joining method of titanium clad steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining lap joints of titanium clad steel and titanium plate, and more particularly to a titanium composite material of titanium clad steel and an extremely thin plate of titanium plate. Used for welding of titanium clad steel used for lining of objects.

[0002]

2. Description of the Related Art Titanium sheets have particularly excellent corrosion resistance as compared with stainless steel, and have recently been used in a wide range of fields such as civil engineering and construction and piping for chemical and nuclear power plants. However, since titanium is expensive, it is often used as a titanium clad steel in which ultra-thin (0.5 mm or less) titanium is joined to the surface of a steel base material.

[0003] When a titanium clad steel is joined to form a structure, for example, as shown in FIG. 7, a titanium plate 2 for joining is used. Welding has been performed. In the figure, reference numeral 9 denotes a torch for TIG welding. However, FIG.
As shown in Fig. 4, when the ultra-thin titanium composite material 4 is arc welded by TIG welding or plasma welding, the molten metal penetrates the titanium composite material, iron is mixed in from the clad steel base material, and the joint becomes brittle. Corrosion resistance is also degraded, making practical arc welding extremely difficult in practice. Therefore, in recent years, resistance welding that can be joined with high efficiency without mixing of iron has been adopted.

[0004]

Among resistance weldings, spot welding cannot be used in places where airtightness is required. Therefore, the application places of spot welding are limited. In the resistance seam welding, a linear structure may remain on the joint surface, and may be partially separated by an external force. Therefore, in such a case, airtightness cannot be maintained. In addition, all of these need to be temporarily attached before resistance welding. Therefore, an object of the present invention is to provide a joining method which has good airtightness at a joint between a thin titanium clad steel of a titanium composite material portion and a thin plate of titanium or a titanium alloy, and is highly efficient and simple.

[0005]

That is, the gist of the present invention is that a titanium plate is applied to a titanium composite material side of a titanium clad steel in which titanium is joined to the surface of a steel base material, and the titanium clad steel and the titanium plate are contacted. In the method of welding lap joints with, after sandwiching an adhesive or pressure-sensitive adhesive between the titanium mixture side of titanium clad steel and the titanium plate in the direction of the welding line, one or both sides near the adhesive or pressure-sensitive adhesive Or a method of joining two or more rows of adhesive or pressure-sensitive adhesive in the direction of the welding line, and then performing resistance welding between them.

[0006]

The resistance welding method may be either resistance spot welding or resistance seam welding, and is performed by the direct resistance welding method shown in FIG. 1 or the indirect resistance welding method shown in FIG. Also, the welding portion is located on the outer side near the adhesive or pressure-sensitive adhesive as shown in FIGS. 1 and 2, inside as shown in FIG. 3, on both sides as shown in FIG.
As shown in (2), it may be any time while the adhesive or the adhesive is sandwiched in two rows. When the joining strength is required, as shown in FIG. 6, after removing the edge of the titanium mixture 4 near the joining of the steel base material 3, the steel base material 3 is welded by arc welding or the like.
Then, the adhesive or adhesive 5 is mixed with the titanium mixture 4 and the titanium plate 2.
And resistance welding by the above method.

[0007] Since an adhesive or pressure-sensitive adhesive is sandwiched between the titanium composite material of titanium clad steel and the titanium plate in the direction of the welding line, the airtightness is good even if the resistance welding portion is partially peeled off. It can be constructed easily. Even if the whole line is not welded by resistance seam welding, since the adhesive or adhesive is sandwiched between the titanium composite material and the titanium plate in the direction of the welding line, airtightness is sufficiently maintained even in resistance spot welding. Dripping. Also,
By sandwiching the adhesive or the adhesive between the titanium mixture of titanium clad steel and the titanium plate, the necessity of temporary attachment before joining is eliminated.

In the present invention, the term "in the vicinity of the adhesive or the pressure-sensitive adhesive" refers to a distance to such an extent that the adhesive or the pressure-sensitive adhesive is not affected by the heat of welding, and is preferably 5 to 50 mm. Adhesives include vinyl acetate, epoxy, and polyurethane, and adhesives include rubber, silicone, and acrylic. These can be used directly between a titanium mixture and a titanium plate, or between acrylic and butyl rubber. Alternatively, a material coated on both sides of a tape of a flexible base material such as a flexible base material may be used.

[0009]

The present invention will be described below in detail with reference to examples. A titanium plate 2 having a width of 200 mm and a length of 500 mm was applied to a titanium clad steel 1 having a width of 300 mm and a length of 500 mm.
The titanium clad steel 1 and the titanium plate 2 were joined by each welding method shown in FIG.

Table 1 shows the thickness of the titanium clad steel 1 and the titanium plate 2, the type of the adhesive or the adhesive, the welding method and the welding conditions. The interval between titanium clad steels is 2
mm. After each welding was completed, it was left outdoors for 120 days. In the airtightness test, TIG
Tack welding with a length of 10 mm and an interval of about 50 mm was performed by welding, and each test plate was cut into a length of 200 mm. After bending the plate 2 at 30 ° with the outside facing, an experiment was performed to determine whether or not water leaked. The results are also shown in Table 1.

[0011]

[Table 1]

In Table 1, the test No. Test Nos. 1 to 5 are examples of the present invention. 1 is direct resistance spot welding by the method of FIG.
Test No. 2 is indirect resistance seam welding by the method of FIG. No. 3 is direct resistance seam welding by the method of FIG. 4 is an indirect resistor series according to the method of FIG.
Welding, test No. Reference numeral 5 shows a result of direct resistance spot welding performed by the method shown in FIG. All of these can be welded with high efficiency, and the test No. 4
Although some of the resistance welds peeled off, good results were obtained in the airtightness tests.

In Comparative Examples, Test Example No. No. 6 shows an example in which indirect resistance seam welding was performed without sandwiching an adhesive or a pressure-sensitive adhesive. Test No. Sample No. 7 was poor in airtightness because direct resistance spot welding was performed without sandwiching an adhesive or a pressure-sensitive adhesive. Test No. In the case of TIG welding 8 shown in FIG. 7, iron was mixed in the welded portion, and rust was generated in the welded portion when left outdoors. In addition, in the bending test, the welded part on one side was broken by the entire line, so the airtightness test was stopped.

[0014]

According to the method for joining titanium clad steel of the present invention, the airtightness of the joint between the thin titanium clad steel of the titanium composite material and the thin plate of titanium or titanium alloy is improved. Therefore, a joint having good corrosion resistance can be efficiently and simply obtained.

[Brief description of the drawings]

FIG. 1 shows the present invention, and is an example in which the outside of a sandwiched adhesive or pressure-sensitive adhesive is subjected to direct resistance welding.

FIG. 2, showing the present invention, is an example of indirect resistance welding on the outside of a sandwiched adhesive or pressure-sensitive adhesive.

FIG. 3 shows the present invention and is an example in which the inside of a sandwiched adhesive or pressure-sensitive adhesive is resistance-welded.

FIG. 4 shows the present invention and is an example in which both sides of a sandwiched adhesive or pressure-sensitive adhesive are resistance-welded.

FIG. 5 shows an embodiment of the present invention, in which an adhesive or a pressure-sensitive adhesive is sandwiched in two rows, and resistance welding is performed between the two rows.

FIG. 6 is an example in which a titanium plate is applied after arc welding of titanium clad steels.

FIG. 7 shows an example in which lap joint welding is performed by TIG welding in a conventional technique.

FIG. 8 shows a bending test of an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Titanium clad steel 2 Titanium plate 3 Steel base material 4 Titanium mixture 5 Adhesive or adhesive 6a-c Electrode 7 Welded part 8 Welded part between titanium clad steels 9 Torch for TIG welding 10 Temporary welding of TIG welding Department

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yutaka Tateno 3-5-4 Tsukiji, Chuo-ku, Tokyo Nippon Steel Welding Industry Co., Ltd. (72) Inventor Yasuo Takahashi 2-6-3 Otemachi, Chiyoda-ku, Tokyo (56) References JP-A-6-198451 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 11/00-11/36 330

Claims (1)

(57) [Claims] A method of welding a lap joint between a titanium clad steel and a titanium plate by applying a titanium plate to a titanium composite material side of a titanium clad steel having titanium bonded to the surface of a steel base material. After one or more rows of adhesive or pressure-sensitive adhesive are sandwiched between the material side and the titanium plate in the direction of the welding line, one or both sides or the middle near the adhesive or pressure-sensitive adhesive are resistance-welded. bonding how titanium clad steel to.