JPH07214336A - Joining method of titanium clad steel - Google Patents

Abstract

PURPOSE:To obtain the welding method having good gas tightness of joint part, high efficiency and simple process by executing resistance welding of one side near an adhesive after the adhesive is sandwiched in weld line direction between titanium cladding material side of titanium clad steel and titanium sheet. CONSTITUTION:Because an adhesive or pressure-sensitive adhesive 5 is sandwiched in weld line direction between a titanium cladding material 4 of a titanium clad steel 1 and titanium sheet 2, a welding resistance part 7 is good at gas tightness as partially peeled and simply to be executed. Even when resistance welding does not weld all lines, an adhesive or pressure-sensitive adhesive 5 is sandwiched in weld line direction between titanium cladding material 4 and titanium sheet 2, the gas tightness is well kept even in the case of resistance spot welding. Also, by sandwiching an adhesive 1 or pressure- sensitive adhesive 5 between a titanium cladding material 4 of titanium clad steel 1 and titanium sheet 2, the tack welding before joining is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lap joint joining method of titanium clad steel and a titanium plate, and particularly to a titanium mixture of titanium clad steel and an ultrathin plate of a titanium plate, for example, a structure in the field of civil engineering and piping. Used for welding of titanium clad steel used for lining products.

[0002]

2. Description of the Related Art Titanium plates have a property of being particularly excellent in corrosion resistance as compared with stainless steel, and have recently come to be used in a wide range of fields such as civil engineering and construction, chemical and nuclear power plant piping fields. However, since titanium is expensive, it is often used as a titanium clad steel in which ultrathin (0.5 mm or less) titanium is joined to the surface of the steel base material.

When joining titanium clad steel to form a structure, for example, as shown in FIG. 7, a titanium plate 2 for joining is used, and a titanium mixture 4 near the joining portion of the titanium clad steel 1 and the titanium clad steel 1 is used. Are overlapped and welded. In the figure, 9 indicates a torch for TIG welding. However, FIG.
When the ultra-thin titanium composite material 4 is arc-welded by TIG welding or plasma welding as shown in Fig. 2, molten metal penetrates the titanium composite material and iron is mixed from the clad steel base material, and the joint becomes brittle. Corrosion resistance also deteriorates, and practical arc welding is extremely difficult. Therefore, in recent years, resistance welding, which does not contain iron and can be joined with high efficiency, has been adopted.

[0004]

Of the resistance welding, spot welding cannot be used in places where airtightness is required. Therefore, the places to which spot welding is applied are limited. In resistance seam welding, a linear structure may remain on the joint surface and may be partially peeled off 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 the joining portion of a thin titanium clad steel of a titanium composite material portion and a titanium or titanium alloy of a thin plate, and which can be simplified with high efficiency.

[0005]

That is, the gist of the present invention is that a titanium plate is applied to the titanium mixture 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 joined together. In the method of lap joint welding with and after sandwiching an adhesive or pressure-sensitive adhesive between the titanium mixture side of titanium clad steel and the titanium plate in the welding line direction, one side or both sides near the adhesive or pressure-sensitive adhesive. Is resistance-welded, or an adhesive or a pressure-sensitive adhesive is sandwiched in two or more rows in the welding line direction, and then resistance welding is performed between them.

[0006]

The resistance welding method may be either resistance spot welding or resistance seam welding, and the direct resistance welding shown in FIG. 1 or the indirect resistance welding method shown in FIG. 2 is used. Further, the welding points are outside the vicinity of the adhesive or the adhesive as shown in FIGS. 1 and 2, inside as shown in FIG. 3, both sides as shown in FIG.
As shown in FIG. 2, it may be arranged between two rows of adhesives or pressure-sensitive adhesives. When the joining strength is required, as shown in FIG. 6, after removing the edge portion of the titanium composite material 4 near the joining of the steel base materials 3, the steel base material 3 is welded by arc welding or the like 8
Then, the adhesive or pressure-sensitive adhesive 5 is applied to the titanium mixture 4 and the titanium plate 2.
It is sandwiched between and in the direction of the welding line, and resistance welding is performed by the above method.

Since the adhesive or pressure-sensitive adhesive is sandwiched in the welding line direction between the titanium mixture of titanium-clad steel and the titanium plate, the airtightness is good even if the resistance weld is partially peeled off. And it can be installed easily. Even if the resistance seam welding is not used for full-line welding, the adhesive or pressure-sensitive adhesive is sandwiched between the titanium composite material and the titanium plate in the welding line direction, so sufficient airtightness is maintained even in resistance spot welding. Be drunk Also,
By sandwiching the adhesive or the pressure-sensitive adhesive between the titanium composite material of the titanium clad steel and the titanium plate, temporary attachment before joining becomes unnecessary.

The vicinity of the adhesive or the pressure-sensitive adhesive in the present invention means a distance such that the adhesive or the pressure-sensitive adhesive is not affected by the heat of welding, and is preferably 5 to 50 mm. Adhesives are vinyl acetate-based, epoxy-based, polyurethane-based, and adhesives are rubber-based, silicone-based, acrylic-based, etc., either directly between the titanium mixture and the titanium plate, or with acrylic or butyl rubber. You may use what was apply | coated to both sides of the tape of a flexible base material, such as.

[0009]

The present invention will be described in detail below with reference to examples. A titanium plate 2 having a width of 200 mm and a length of 500 mm is 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 adhesive or pressure sensitive adhesive, the welding method and welding conditions. The spacing between the titanium clad steels is 2
mm. After the completion of each welding, it was left outdoors for 120 days. The airtightness test is performed by TIG the steel base material on the back side before the test.
By temporary welding with a length of 10 mm and a gap of about 50 mm, each test plate was cut into a length of 200 mm, and the titanium clad steel was bent with a bending jig having a radius twice the thickness of the titanium clad steel as shown in FIG. After bending the plate 2 at 30 ° outside, an experiment was conducted as to whether or not water leaked. The results are also shown in Table 1.

[0011]

[Table 1]

In Table 1, test No. 1 to 5 are examples of the present invention, and test No. 1 is direct resistance spot welding by the method of FIG. 1,
Test No. 2 is indirect resistance seam welding by the method shown in FIG. No. 3 is a direct resistance seam welding, test No. 3 by the method of FIG. 4 is the indirect resistance series by the method of FIG.
Welding, test No. In No. 5, direct resistance spot welding is performed by the method shown in FIG. All of these can be welded with high efficiency, and are tested in the bending test after being left outdoors. Four
Although part of the resistance welded part peeled off, good results were obtained in all in the airtightness test.

In Comparative Examples, Test Example No. No. 6 is an example of indirect resistance seam welding without sandwiching an adhesive or a pressure-sensitive adhesive, and in the bending test, the welded part was partially peeled off and the airtightness was poor. Test No. In No. 7, since direct resistance spot welding was performed without sandwiching an adhesive or a pressure sensitive adhesive, airtightness was poor. Test No. No. 8 was TIG welded as shown in FIG. 7, but iron was mixed in the weld and rust occurred in the weld when left outdoors. Further, in the bending test, the welded portion on one side was completely broken, so the airtightness test was stopped.

[0014]

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

[Brief description of drawings]

FIG. 1 illustrates the present invention and is an example of direct resistance welding on the outside of a sandwiched adhesive or pressure-sensitive adhesive.

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

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

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

FIG. 5 illustrates the present invention and is an example in which two rows of adhesives or pressure-sensitive adhesives are sandwiched and then resistance welding is performed between them.

FIG. 6 is an example in which titanium clad steels are arc-welded together and then a titanium plate is applied.

FIG. 7 is an example of performing lap joint welding by TIG welding in the related art.

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 compound material 5 Adhesive or adhesive 6a-c Electrode 7 Welding part 8 Welding part between titanium clad steels 9 TIG welding torch 10 Temporary welding of TIG welding Department

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Tateno Yutaka Tateno 3-5-4 Tsukiji, Chuo-ku, Tokyo Inside Nittetsu Welding Industry Co., Ltd. (72) Yasuo Takahashi 2-6 Otemachi, Chiyoda-ku, Tokyo 3 Within Nippon Steel Corporation

Claims (1)

[Claims] 1. A method of performing a lap joint welding of a titanium clad steel and a titanium plate by applying a titanium plate to the titanium mixture side of a titanium clad steel in which titanium is joined to the surface of a steel base material, The adhesive or pressure-sensitive adhesive is sandwiched between the material side and the titanium plate in the welding line direction in one or more rows, and one side or both sides or the middle of the adhesive or pressure-sensitive adhesive is resistance-welded. And the joining method of titanium clad steel.