JP3447891B2 - How to join the end of the strip to a flat surface - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an end face of a metal strip into a flat metal face wider than the end face, for example, a flat face of a metal plate such as an end plate. about the how to join in. [0002] Conventionally, H-section steel, I-section steel, square steel pipe,
Metal strips such as round steel pipes are used as building materials. When these strips are used as beams and fixed to a column, an end plate made of a steel plate is joined in advance to the end face of the strip, and the end plate is brought into contact with the side surface of the column and fixed with bolts or the like. Many methods have been adopted. Here, welding (for example, butt welding) has been used to join the end face of the strip to the end plate. [0003] However, conventionally, welding of an end plate to an end face of a strip material is performed manually, and there is a problem that workability is poor. Also,
Since the strength due to welding is greatly affected by the welding quality, skilled workers must carefully work when welding the end plate to the end face of the strip, and workability is poor from this point as well Was a problem. The present invention has been made in view of such a problem, and enables a flat surface of a metal such as an end plate to be easily joined to an end surface of a metal strip at a constant quality. an object of the present invention is to provide an mETHODS. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem of welding by joining a metal strip material by joining an end face of the metal strip to a flat metal face such as an end plate. adopts liquid phase diffusion bonding method, moreover, Ekisho拡
In performing the dispersion joining, the end face of the strip material to be joined is
The liquid phase expansion is applied to one of the
Join the insert material for diffusion joining, and
Inactive atmosphere with the flat surface facing away from the flat surface
An induction coil between an end surface of the strip and the flat surface.
And the end surface of the strip,
The part joining the insert material and the end face of the flat material
Heat to above the melting point of the insert material, then
Disconnect the conducting coil between the end surface of the strip and the flat surface
Position, and insert the end face of the strip material with the insert material.
To the flat surface and apply contact pressure to expand the liquid phase.
This is a configuration in which diffusion joining is performed . In this liquid phase diffusion bonding, the insert material is diffused into the base material to be bonded (the end surface of the strip and the flat surface) and bonded, so that the bonding is performed on the surface, and the structure at the bonded portion becomes uniform and the bonding is performed. Since the interface is substantially eliminated, a high-strength joint can be formed, and its quality can be controlled by the temperature and pressure of the joint, so that a constant-quality joint can be easily obtained. Thus, according to the present invention, the end surface of the metal strip can be firmly joined to the flat surface of the metal with a constant quality without skill. In addition, the temperature required for joining may be slightly higher than the melting point of the insert material, and may be substantially lower than the melting point of the base material such as the strip material and the end plate to be joined. It is unlikely that the base material becomes hot and its physical properties (particularly impact resistance, toughness, etc.) are reduced by its heat history. For this reason, the end plate-attached strip produced according to the present invention has characteristics such as high joining strength, stable quality, and a small decrease in physical properties in a region adjacent to the joining portion. Furthermore, liquid phase diffusion bonding
In carrying out the work, the end face of the strip material to be joined and its
With the flat surface that joins the end faces facing away from each other,
Induction heating with an induction coil placed between
With this, it is possible to quickly heat the necessary parts for joining.
And increase productivity and heat loss
Can be minimized, and unnecessary parts can be exposed to high temperatures.
No deterioration due to heat history
it can. DETAILED DESCRIPTION OF THE INVENTION The basic mode of the present invention is that an end face of a strip material to be joined is abutted to a flat face to be joined via an insert material for liquid phase diffusion joining, The temperature of the material and the portion in contact with the insert material is equal to or higher than the melting point of the insert material, and a contact pressure is applied so that the end face of the strip material butted through the insert material does not separate from the flat surface, thereby performing liquid phase diffusion bonding. This method is characterized in that the end face of the strip is joined to a flat surface, and liquid phase diffusion bonding of the end face of the strip to the flat face can be performed by this method. The strip used in the present invention includes H-section steel,
Examples include an I-shaped steel, an L-shaped steel, a square steel pipe, a round steel pipe, a round or square bar, a steel sheet and the like. The flat surface to be joined is preferably a flat surface of a metal plate such as an end plate, but may be a flat surface of a metal material other than the metal plate (for example, a metal pillar or the like). Good. The insert material is optional as long as it can be used for liquid phase diffusion bonding,
When the material to be joined is steel, an amorphous metal foil is usually used. Heating to raise the temperature of the insert material and the part in contact with the insert material above the melting point of the insert material
Is performed before the operation to match the end surface of the strip to the flat surface,
The heating and liquid phase diffusion bonding, intends row in an inert atmosphere to prevent oxidation of the bonding surface. [0008] The contact pressure applied between the end surface of the strip and the flat surface during the liquid phase diffusion bonding is preferably as low as possible so that both can be kept in close contact with each other.
It is selected to be about MPa, preferably about 5 to 10 MPa. In addition, during liquid phase diffusion bonding at such a low contact pressure, it is also possible to increase the contact pressure for a short time to press the bonding surface. When such pressurization is performed, a state such as mechanical entanglement occurs on the bonding surface, and the bonding strength can be increased. Also, even if an oxide film is generated on the bonding surface, As a result, the oxide film is broken, the metals come into contact with each other, and true metal-to-metal bonding is obtained, and this also increases the bonding strength. Further, the pressure increases the thickness of the end face portion of the strip, increases the joining surface, and increases the overall joining strength. However, if this pressure is too large,
When the pressurizing time is long, undesired deformation may occur at the end of the strip, and the strength may be reduced. Taking these into consideration, the contact pressure at the time of pressurizing is 20 to 1
The pressure is selected to be about 00 MPa, preferably about 40 to 60 MPa, and the pressurization time is selected to be about 2 to 10 seconds. Hereinafter, the present invention will be described more specifically with reference to the drawings by taking, as an example, a case in which a flat surface of an end plate is joined to an end surface of a H-shaped steel strip. [0015] As shown in FIG . 1 , the end is provided as shown in FIG . The plate 2 is placed on the support base 3, and an insert material 4 for liquid-phase diffusion bonding is attached to the flat surface 2 a of the end plate 2 and to a portion where the end surface of the strip 1 is bonded, and the upper portion is separated therefrom. At a position facing the end surface 1a of the strip material 1, the induction coil 8 is arranged between the two, and the entire shield case 15
Cover with. The induction coil 8 used here is shown in FIG.
As shown in FIG.
A Hollow rectangular cross section made of a conductor such as copper around 9
Are arranged. 10 is insulated
Material . The insert 4 may be attached to the end surface 1a of the strip 1. Next, in a state where an inert gas (for example, nitrogen gas) is supplied into the shield case 15 to form an inert atmosphere, an alternating current is applied to the induction coil 8 and the end face 1a of the strip 1 facing the same. Then, the insert 4 and the end plate 2 thereunder are heated to the melting point of the insert 4 or higher. Thereafter, the induction coil 8 is moved to a position deviated from below the strip 1, the strip 1 is lowered, and the end surface 1 a of the strip 1 abuts on the flat surface 2 a of the end plate 2 via the insert 4, and An appropriate pressing force is applied to the strip 1.
Thereby, the end surface 1a of the strip 1 and the flat surface 2a of the end plate 2 are kept in close contact with each other via the insert material 4, and liquid phase diffusion bonding is performed. At this time, if necessary, an auxiliary coil may be arranged around the end of the strip 1 to perform auxiliary heating, or the auxiliary heating may be performed from the back surface of the end plate 2 by a heating means such as an induction coil or a burner. Good. In that case, the support 3 is naturally configured to heat a desired position on the lower surface of the end plate 2. In this method, since the end surface 1a of the strip 1 and the flat surface 2a of the end plate 2 are directly heated by the induction coil 8, there is an advantage that the heating efficiency is good and the production efficiency is good because the temperature rise is fast. can get. Further, since unnecessary portions are not heated to a high temperature, there is an advantage that the physical properties are not deteriorated due to the heat history and the quality is good. The embodiment in which the upright H-shaped steel is joined to the horizontally disposed end plate has been described above. However, the end plate may be in contact with the end surface of the horizontally disposed H-shaped steel. EXAMPLES (1) Test material strip 1: H-section steel cross section: Web length 200 mm, thickness 5.5 mm Flange width 100 mm, thickness 8.0 mm Composition: C 0.06%, Si 0.18%, Mn 0.1.
71%, P 0.021%, S 0.012% Tensile strength: 456 N / mm ² End plate 2: steel plate dimensions: length 400 mm, width 250 mm, thickness 16 mm Composition: C 0.14%, Si 0.1% 19%, Mn 0.1.
85%, P 0.014%, S 0.014% Tensile strength: 448 N / mm ² (2) Insert material Nominal composition of amorphous metal foil: Cr 5.3%, Si 7.3%, B 1.4% ,
Remaining Ni Melting point: 1040 ° C. Thickness: 38 μm (3) The end surface of the preparatory strip 1 before joining was cut flat and machine-finished (finishing accuracy: Δ ). The surface of the end plate 2 was grinded and finished with sandpaper. (4) Joining Method As shown in FIG. 1 , an insert material 4 is attached to the upper surface of the end plate 2, and the end plate 2 and the strip material are attached. 1 was maintained at a distance of 30 mm from the end face, and an induction coil 8 (dimension in the height direction: 10 mm) was disposed at an intermediate position therebetween. With the nitrogen gas being supplied into the shield case 15, the induction coil 8 is energized (frequency about 40 KHz, power about 80 K
W), the end surface 1a of the strip material 1, the insert material 4, and the upper surface 2a of the end plate 2 were heated to about 1280 ° C. Thereafter, the induction coil 8 is moved to a position deviated from the end surface 1a of the strip 1, and the strip 1 is lowered and pressed against the insert 4 on the end plate 2, and released while keeping the contact pressure at 10 MPa. Cooled down. (5) Result With the above joining operation, the end face of the strip 1 can be joined to the flat surface of the end plate 2, and no notch is generated at the joining portion. When the tensile strength of the joint was measured, the vicinity of the joint was broken at 460 N / mm ² . this
Is almost equal to the tensile strength of the base material (strip 1).
Thus, the joint had good tensile strength properties. As is apparent from the above description, according to the present invention, the end face of the strip material to be joined and the flat face joining the end face are used.
Insert for liquid phase diffusion bonding on either side
Materials, and the end face of the strip and the flat face are separated from each other.
End face of the strip in a state of facing and in an inert atmosphere
An induction coil is placed between the
The end face of the strip, the insert and the flat
The portion you join the elongated member end face of Tanmen fusion of the insert member
Above the point, then the induction coil is
Move to a position deviating between the end face and the flat face,
The end face of the strip is projected to the flat face via the insert material.
Liquid phase diffusion bonding by applying contact pressure
Thereby , the end face of the strip and the flat face can be liquid-phase diffusion-bonded, whereby there is substantially no bonding interface,
A high-strength joint having a uniform structure at the joint can be formed, and its quality can be controlled by the temperature and pressure of the joint, so that a joint of constant quality can be easily obtained. In addition, the temperature required for joining only needs to be slightly higher than the melting point of the insert material, and may be substantially lower than the melting point of the base material such as the strip or end plate to be joined. There is little effect that the physical properties (particularly impact resistance, toughness, etc.) are reduced by the heat history of the base material due to its heat history, and therefore there is also an effect that almost no heat treatment is required after joining. Further, a portion necessary for joining is formed by an induction coil.
What can be quickly heated, it is possible to minimize the heat loss with Accordingly productivity can be improved,
In addition, since an unnecessary portion is not heated to a high temperature, an effect that a decrease in physical properties due to heat history can be suppressed can be obtained. The above-mentioned method end plate with strip material manufactured, the junction is a reliable quality of the strip member and the end plate has the effect that less stable and, moreover thermal degradation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a method for forming a strip by a method according to an embodiment of the present invention .
This explains the operation of joining to a flat surface.
Schematic side view showing a plane 2 is a schematic bottom view EXPLANATION OF REFERENCE NUMERALS 1 strip material 1a facet second end plate 2a flat surface 3 support 4 insert material 8 induction coil of the induction coil 8

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsukasa Maenozono 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within Dai-ichi High Frequency Industry Co., Ltd. (72) Tomoyuki Nakano Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture JP-A-6-238467 (JP, A) JP-A-6-277858 (JP, A) JP-A-55-136587 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B23K 20/00-20/26

Claims (1)

(57) the end surface of the Claims 1] metal strip material, a method of bonding the flat surface of the wider metal than its end face, the end face of the elongated member to be subjected to joining and its Either with a flat surface joining the end faces
On the other hand, an insert material for liquid phase diffusion bonding is joined,
With the end surface of the strip and the flat surface facing each other at a distance,
Between the end face of the strip and the flat face in an inert atmosphere.
An induction coil is arranged between the coils, and the induction coil
The end face of the strip, the insert material and the flat face end face
Heat the part to be joined to the melting point of the insert material or higher,
Then, the induction coil is connected to the end face of the strip and the flat face.
And move the end face of the strip to the
Butt against the flat surface through the insert material, contact pressure
A liquid phase diffusion bonding method is used to join the end faces of the strip to a flat surface.