JPH0369632B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for manufacturing titanium or titanium alloy clad steel which is inexpensive, has stable properties, and is simple. [Conventional technology] Conventionally, titanium and titanium alloy clad steel (1)
It used to be manufactured using the explosion bonding method, but in recent years, (2) manufacturing technology using the rolling method has been attracting attention. In addition, (3) a method of joining by resistance welding using brazing metal, (4)
There are various methods such as a method of manufacturing clad steel by overlay welding. These titanium clad steel manufacturing methods are industrially useful and have various features. The explosion bonding method has many manufacturing records and is the main manufacturing method for titanium clad steel, but there are various issues such as dimensional restrictions and high manufacturing costs, but dimensional restrictions are being eased by combining it with the rolling method. . In addition, the manufacturing technology using the rolling method has been developed in recent years and is a relatively low-cost manufacturing method that can manufacture wide and long materials, but it requires hot, high-reduction rolling, which requires a variety of large-scale equipment. etc., making it difficult to handle small lots. In addition, since the properties of the base material change due to hot working, complicated steps are required, such as post-heat treatment. Next, the method of joining by resistance welding using brazing filler metal is simple and ideal for small-lot production, but it is difficult to select the brazing filler metal, and when low-cost brazing filler metal is used, the bonding strength is low, etc. There is instability. On the other hand, if a brazing material containing silver or the like as a main component is used, the bonding properties etc. will be stabilized, but the manufacturing cost will increase and this method cannot necessarily be said to be an established method for industrial production. Furthermore, although the manufacturing method by overlay welding is a simple method, since titanium is a metal that is active at high temperatures, it is extremely difficult to seal the atmosphere, and high heat input welding methods cannot be used, so multilayer welding has to be used. However, manufacturing costs will increase. Utility Model Publication No. 57-24459 discloses a clad steel in which a thin copper plate and a stainless steel mesh are inserted and welded between a steel plate and a titanium plate. However, this method is complicated and expensive due to the interposition of a copper thin plate and a stainless steel mesh. JP-A-56-80381 describes a method of lap welding titanium and stainless steel through copper using an electron beam or laser beam, but this method requires expensive welding equipment to obtain large joints. . There are also various technical issues, such as restrictions on the metals that can be welded to titanium. [Problems to be Solved by the Invention] Conventional methods for manufacturing titanium clad steel, such as the explosion bonding method and the hot rolling method, require large-scale manufacturing equipment and have various manufacturing environment constraints. In addition, joined clad steel not only requires heat treatment to remove distortion during manufacturing and restore the material properties of the base material, but also has restrictions on size, shape, etc. The combination of materials and manufacturing process were complicated, the material properties varied, and the manufacturing method was expensive. The present invention solves the above-mentioned problems that were difficult to solve with conventional methods, and also provides a simple method for manufacturing titanium clad steel that is inexpensive and has stable properties. It is no exaggeration to say that the present invention aims to provide a method for manufacturing titanium clad steel that can be applied to cylindrical processed products, has few shape restrictions, and has a wide range of applications. [Means for Solving the Problems] The gist of the present invention is to insert ultra-low carbon steel as an insert material into the joint surface of titanium material and steel and pressurize the joint by resistance welding when manufacturing titanium clad steel. There is a method for manufacturing titanium clad steel having the following features. The present invention will be explained in detail below. [Function] Fig. 1 shows the structure of the titanium and titanium alloy clad steel of the present invention in which an ultra-low carbon steel plate 2 is inserted between the base material 3 and the laminated material 1, and Fig. 2 shows the structure of the titanium and titanium alloy clad steel of the present invention. FIG. 2 is a schematic diagram of resistance welding when manufacturing. A laminated assembly in which an ultra-low carbon steel plate 2 is sandwiched between a base material 3 and a titanium plate 1 as a laminate material is placed between the titanium plate 1 and the base material 3 using a loading mechanism 6 attached to a roller electrode 4 of a resistance welding machine 7. When the roller electrode 4 is energized while applying a load, an electric circuit is formed by 4A-1-2-3-4B-5, and the interface between the titanium plate 1 and the ultra-low carbon steel plate 2 and between the ultra-low carbon steel plate 2 and the base material 3 are formed. Resistance heat is generated at the interface, and both interfaces are melted and welded. While applying a load with the loading mechanism 6, the roller electrode 4
By rotating A and 4B continuously,
Resistance welding of a band-shaped portion matching the width of the roller electrodes 4A, 4B is realized. In order to obtain a wide-width welded material over the entire surface, it is possible to further perform welding by shifting the width of the roller electrode. It goes without saying that spot welding or line welding may be used for applications that do not require full-surface welding, and low carbon steel is preferable for the base material, but there are no particular limitations on the base material and the laminate, and any desired combination can be joined. Conventionally, when titanium and steel are welded, TiC is added to the joint.
It is said that welding is impossible because brittle precipitates or precipitated phases are formed, which deteriorates the joint strength. In order to prevent the precipitation of these brittle precipitates or precipitate phases, the present invention selects ultra-low carbon steel as the insert material, and also prevents the diffusion of carbon, etc., which is the forming element of brittle precipitates and precipitate phases. The unique feature is that resistance welding was used as a method to minimize the high temperature residence time, making it possible to manufacture clad steel with stable and excellent bonding properties. The ultra-low carbon steel used as the insert material in the present invention preferably has a carbon content of 0.08 wt% or less. Furthermore, since this manufacturing method allows work to be carried out at room temperature and in an air atmosphere, it is characterized by fewer constraints such as atmosphere control, which are often encountered when bonding titanium. The present invention will be specifically explained below. [Example] The present inventors prepared JIS H 4600 with the composition shown in Table 1.
Cold-rolled titanium plates equivalent to Class 1 are used as the laminating material, stainless steel JIS G 4300 SUS 304 shown in Table 2 and rolled steel JIS G 3106 SM41B for welded structures are used as the base material, and the insert material is made of ultra-low carbon material shown in Table 3. Titanium clad steel was fabricated by resistance welding in an atmospheric atmosphere using steel plates such as JIS G 3141 SPCE. The manufacturing process involves cleaning the base material, mating material, and insert material with acetone, then laminating and assembling each material.
Spot welding and seam welding were carried out in an atmospheric atmosphere using a resistance welding machine. Table 4 shows the spot welding results. No. 3 is a material without inserts, and because a brittle phase is formed at the joint, it has some shear strength, but its bending properties are significantly inferior. In addition, Nos. 4 and 5 use Ni-based insert materials, which have good shear strength and can be used for simple processing, but cannot withstand processing under severe conditions. Bonding materials Nos. 1 and 2 are bonding materials according to the present invention, which have good shear strength, good bending workability, and excellent bonding properties. Next, Table 5 shows the seam welding results. The combination of SUS 304 as the base material and titanium plate as the mating material allows for half-cycle and 2-cycle energization 1
These are the results of seam welding under the conditions shown in Table 5 as two methods of cycle rest. In the present invention, 0.2 mm thick tin plate JIS G
It is made by joining 3303 with a chrome-plated steel plate as an insert material, and has excellent shear strength, good bending workability, and excellent bonding properties. On the other hand, comparative materials 3 and 4 had inferior shear strength;
The results demonstrate that it is generally said that titanium and iron cannot be joined because of their poor bending cracking properties. According to the manufacturing method of titanium clad steel according to the present invention, since only the vicinity of the joint interface is fused and joined, the properties of the base material hardly change, so there is no need for heat treatment such as annealing or annealing. Clad steel for applications that require it to be used as a material can also be manufactured without changing the method in any way. So far, we have described manufacturing examples of titanium clad steel flat plates, but it goes without saying that this method can be used as a cladding technique at various construction sites, including application to the base material of cylindrical pipes.

〔Effect of the invention〕

The present invention uses ultra-low carbon steel plates as insert materials at room temperature and atmospheric conditions, and joins them by resistance welding.

【table】

【table】

[Table] *2 truncated cone electrode

【table】

[Table] This method has fewer restrictions on the combination of base material and cladding material, and
Since the welding is carried out in a limited area near the joint interface, there is almost no change in the performance of the base metal, so there is no need for post-joining heat treatment, making it a simple, low-cost, and highly applicable method with excellent material properties. It is a manufacturing method and has a large contribution to the industry.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of assembly during production of titanium and titanium alloy clad steel according to the present invention, and FIG. 2 is a perspective view showing a configuration when producing titanium clad steel. 1... Titanium material, 2... Insert material, 3...
Base material, 4... Roller electrode, 5... Earth, 6...
Load mechanism, 7...Resistance welding machine, P...Load direction,
W...Roller traveling direction.

Claims (1)

[Claims] 1. A method for manufacturing titanium clad steel, which is characterized by overlapping the entire surface of titanium material and steel, inserting an ultra-low carbon steel plate between them as an insert material, and joining them under pressure by resistance welding. .