JPS63248581A - Joining method for metal - Google Patents

Abstract

PURPOSE:To eliminate the need for the necessary energy in melting and the heat treatment after welding by joining the joining face of a metal by pressurizing it in a liquid Na of limited temp. CONSTITUTION:The joining is effected by abutting joining faces so that the gap G on the beveling face of a steel stock 1 may become zero, inputting in the bath 3 in which the liquid Na of about 200-700 deg.C is contained and exerting the pressurizing force 4 of about 3-10kg/cm<2>. At this time, a good joining is obtainable by adequately changing the temp., heating time and pressure of the liquid Na according to the plate thickness, material, shape, etc. The liquid Na can activate the metal surface, clean the joining surface, diminish the distance among metal elements and make the joining easy, but the diffusion is delayed less than 200 deg.C to reduce the joining. Since the material is transformed at more than 700 deg.C 200-700 deg.C are appropriate. The pressurizing force is to be 3-10kg/cm<2> as the adequate range.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a metal joining method.

[Conventional technology]

Conventional welding of metal parts involves heating above the melting point of the metal.
It is common to perform fusion bonding using a melting phenomenon.

However, in these welding processes, the parts to be joined are directly heated to high temperatures, for example, in the case of steel materials, the temperature is generally raised to above the melting point of 1,400 to 1,500 degrees Celsius, which alters the quality of the weld metal and weld heat-affected zone, deteriorating its toughness and corrosion resistance. At the same time, high residual stresses occur.

For this reason, ordinary metal welding requires high energy to melt the metal, and also requires post-weld heat treatment to improve material quality and relieve stress.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
In addition to eliminating the need for the energy supply required for melting,
The purpose of the present invention is to provide a metal joining method that does not require heat treatment after welding and enables energy-saving, high-quality joining.

[Failure to solve the problem]

To this end, the present invention is characterized in that the joining surfaces of the metals are pressurized and joined in liquid Na at 200 to 700°C.

[For production]

With the above-described structure, it is possible to obtain a metal joining method that does not require the supply of energy necessary for melting, does not require heat treatment after welding, and enables energy-saving and high-quality joining.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the method of the present invention, and FIG. 2 is an explanatory diagram of a specific example.

First, in Fig. 1, two steel plates 1 with a thickness of 21111 are butted together so that the gap G of the groove surface becomes Q arm, and a bathtub 3 containing 9 liquid Na:2: of approximately 200 to 700°C.
and join by applying pressure 4 of 3 to 10 kglcrl.

In this case, at about 200°C, it takes time to join because the temperature is low, but at about 500°C to 700°C, joining can be done in 1 to 5 hours.

In this way, in the method of the present invention, the plate thickness and material are controlled.

A good bond can be obtained by appropriately changing the liquid Na temperature, heating time, and pressure depending on the shape, etc., but liquid Na activates the metal surface and cleans the metal bonding surface. Although this reduces the distance between metal elements and facilitates bonding, below 200°C diffusion slows down and bondability deteriorates, and above 700°C the material undergoes transformation, so 200 to 700°C is appropriate.

Further, if the pressing force is less than 6 kg/cnl, bonding will not be possible due to insufficient pressure, so a higher pressure is required, but 3 to 10 kg A4 is an appropriate range when considering equipment capacity, material deformation, etc.

Figure 2 shows a plate thickness of 9Cr-IMo steel with a thickness of 2111111. I
Specific examples of experiments conducted with various liquid Na temperatures, heating times, and pressurizing forces on plate materials with shaped grooves are shown.
a Temperature 200-700℃, pressure 3-10 kglcr
Good bonding was obtained with ll.

As described above, according to the method of the present invention, metals can be joined without raising the temperature to the melting point and melting unlike conventional welding, so there is no need to supply the energy necessary for melting, and there is no need to use welding materials. Also, since there is no material deterioration, there is no need for heat treatment after welding, and as a result, energy-saving, high-quality joining is possible.

〔Effect of the invention〕

In short, according to the present invention, liquid Na at 200 to 700°C
By pressurizing the joint surfaces of metals to join them, there is no need to supply the energy necessary for melting, and there is no need for heat treatment after welding, making it possible to join metals with low energy consumption and high quality. The present invention is industrially extremely useful.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the metal joining method of the present invention, and FIG. 2 is an explanatory diagram of a specific example. 1... Steel material, 2... Liquid Na, 3... Bathtub, 4...
...pressure force. Agent Patent Attorney Tadashi Tsukamoto Figure 1 Figure 2 Figure 2 combination f
46 hoe thousand toru.

Claims (1)

[Claims] A method for joining metals, characterized in that the joining surfaces of metals are joined by applying pressure in liquid Na at 200 to 700°C.