KR20020016011A - Apparatus and method for arc brazing for pipe and sheet - Google Patents

Abstract

PURPOSE: An apparatus and a method for arc brazing a sheet and a pipe is provided which automates arc brazing work regardless of sizes and thickness of an object to be welded, and arc welds the pipe and sheet as minimizing thermal deformation at the welding part with a minimum quantity of heat. CONSTITUTION: The apparatus for arc brazing a sheet and a pipe comprises a base part(10) equipped with a first horizontal stand(14) installed at the center of a vertical base(12) and a second horizontal stand(16) vertically movably installed on the upper part of the vertical base(12); a fixing member equipped with a cooling block which is installed on the first horizontal stand(14) so as to cool and fix the sheet; an arc torch(40) which is fixed to a distance adjusting member(30) so that the arc torch(40) is positioned in a certain angle to a brazing part of the sheet and the pipe(4) and spaced apart therefrom in a certain distance, and which is surrounded by a certain flow rate of argon gas as a certain voltage and a current are being impressed, wherein the distance adjusting member(30) is laterally installed at the lower part of a driving shaft(32) which is vertically installed at the end part of the second horizontal stand(16) so as to drive the driving shaft(32) to a certain speed by a motor; a wire having a certain diameter which is supplied by a wire feeder(52) installed at one side of the vertical base(12), and which is supplied by passing through the center of the arc torch(40); and a center adjusting block(60) which is fixed to the center of the pipe(4) that is positioned at the inner side of the sheet fixed to the lower part of the driving shaft(32) by the fixing member.

Description

Arc brazing device for thin plates and pipes and its method {APPARATUS AND METHOD FOR ARC BRAZING FOR PIPE AND SHEET}

The present invention relates to a pipe for performing welding between a pipe, which is a fuel injection port, and a thin plate fixing the same, and an arc brazing apparatus for the thin plate, and more particularly, to a center stator positioned at the center of the pipe and thus along the circumference of the pipe. By rotating the arc torch installed to perform the brazing operation of the pipe and sheet regardless of the size and thickness of the welding object, while automating the arc brazing operation, the pipe to perform arc welding of the pipe and sheet with the minimum amount of heat to the welded area. The present invention relates to an arc brazing device and a thin plate.

In general, brazing is also called a soldering method, in which metals (solder materials) having a lower melting point than the base materials are infiltrated into the gaps of the joining surfaces by using a capillary phenomenon without melting the base metal to be welded. It is a method of welding that is combined by diffusion penetration.

On the other hand, in the case of welding between pipe and sheet, which is a conventional fuel injection hole, in order to maintain airtightness in the least costly and easy way, soldering after spot welding or torch (gas) brazing using oxygen, acetylene, or propane The method has been widely used.

However, in the welding method using such a torch, not only the area heated by the torch is large, but also the feeding speed, the brazing speed, and the flue gas flow rate have to be balanced separately according to the rolling of the torch. In the end, welding of pipes and sheets was carried out depending on the experience and function of the operator.

In addition, in the case of torch brazing, a large amount of heat received by a material due to a large heating area, and in the case of a thin plate material, there is a problem that cracks due to heat deformation easily occur.

Moreover, since the deformation of the material due to heat, especially the warpage, occurs severely, it is difficult to accurately evaluate the brazing without forming the mold so that it can be constrained to a certain shape. There was a problem that was time-consuming and expensive.

The present invention has been made in order to improve the various problems as described above, the object is to perform the brazing operation of the pipe and sheet as a center stator located in the center of the pipe and an arc torch installed to rotate along the circumference of the pipe. The present invention provides a pipe and sheet arc brazing apparatus and method for automating an arc brazing operation regardless of the size or thickness of a welded object, while performing arc welding of pipes and sheets with a minimum amount of heat at the welded portion. have.

1 is an overall configuration diagram showing a brazing apparatus for pipes and thin plates according to the present invention.

2 is a main configuration diagram showing the brazing device of the present invention

Figure 3 is a schematic plan view showing the cooling means of the brazing device of the present invention

Figure 4 is a graph showing the displacement of the volume and the current changes in the brazing device of the present invention

Figure 5 (a) and (b) is a state diagram showing the front and back brazing state of the specimen according to the conventional gas torch and the arc brazing operation of the present invention

Figure 6 (a) and (b) is a state diagram showing the texture characteristics of the specimen according to the arc brazing of the present invention and the conventional gas torch welding

Explanation of symbols on the main parts of the drawings

1 .... Brazing device 10 .... Base part

12, ... vertical base 14.16 .... 1st and 2nd horizontal level

20 ... holding member 22 ... cooling block

30 .... Spacing member 32 .... Drive shaft

40 .... Arc Torch 50 .... Wire

52 .... Feeder 60 .... Centering block

As a technical configuration for achieving the above object, the present invention is a base portion having a first horizontal stage installed in the center of the vertical base and a second horizontal stage installed to move up and down on the vertical base,

A fixing member having a cooling block installed to cool the thin plate on the first horizontal object;

It is fixed to the brazing portion of the thin plate and the pipe at a predetermined angle and at a predetermined interval to the spacing member arranged horizontally below the drive shaft installed vertically to drive the constant speed as a motor at the end of the second horizontal stage, while applying a constant voltage and current An arc torch surrounded by a certain amount of argon gas,

A wire of constant diameter supplied as a feeder installed on one side of the vertical base and supplied through the center of the arc torch,

By providing the arc brazing apparatus of the thin plate and the pipe consisting of a center adjusting block which is installed to be fixed to the center of the pipe located in the inner side of the thin plate fixed as a fixing member at the lower end of the drive shaft.

In another aspect, the present invention, in the brazing method of the thin plate and the pipe, a pipe having a diameter of 36-40φ and a thickness of 0.8-1.2t while operating the hydraulic unit between the upper and lower fixed blocks of the second horizontal stage Secure the thin plate with the thickness of 0.8-1.2t located between the half arc cooling blocks,

Adjust the height of the second horizontal band on the vertical base to position the conical centering block at the bottom of the drive shaft installed at the end of the second horizontal band in the center of the pipe,

After fixing the arc torch to have an angle of 30-60 ° and an interval of 5-10 mm, 1-10 mm as a fixing jig at the end of the gap adjusting member installed at the lower part of the drive shaft,

While supplying a wire having a diameter of 0.8-1.2t as a feeder through the arc torch, while argon gas is blown out through the torch at a flow rate of 10-25 l / min to surround the brazing part,

While applying a voltage of 14-20V and a current of 40-120A to the arc torch, the cooling water flows through the supply and discharge pipes of the cooling block, and the brazing part is operated at a speed of 18-60 cm / min by a motor driven drive shaft. The arc torch is rotated according to the arc brazing method of the thin plate and pipe to perform the arc brazing operation of the thin plate and pipe.

Hereinafter, the arc brazing apparatus 1 of the thin plate 2 and the pipe 4 of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram showing a brazing apparatus of a pipe and a plate according to the present invention, Figure 2 is a main configuration diagram showing a brazing apparatus of the present invention, Figure 3 is a schematic diagram showing a cooling block of the brazing apparatus of the present invention. Top view.

First, Figure 1 shows the base portion 10 of the apparatus 1 of the present invention, the vertical base 12 is integrally vertically coupled fixed to the base plate 10a installed on the ground is a rectangular hollow inside It is formed of steel, and the first horizontal stage 14, which is a support bolt during brazing operation, is fixed to the vertical base 12 at the center of the vertical base 12 as a fixing bolt.

In addition, FIG. 2 shows the second horizontal bar 16, which moves along the screw bar 16a installed between the upper and lower fixing plates in the hollow part of the upper part of the vertical base 12, which is the rectangular steel. One side of the installed moving block (16c) is horizontally fixed integrally through the opening formed in the vertical base (16).

In addition, the moving block 16c is connected to the handle 16b installed to protrude to the outside through the opening of the vertical base 16, although not shown in detail in the drawing, the moving block when operating the handle 16b 16c is installed to move up and down along the screw bar 16a, so that the second horizontal bar 16 is also configured to move up and down when the handle 16b is operated.

Next, FIG. 1 and FIG. 2 show a fixing member 20 installed to fix the thin plate 2 on the first horizontal stand 14 so that the fixing member 20 is interposed on both sides. The hydraulic unit 24 is made up of the upper and lower fixed blocks 20a and 20b that are fixed to both ends of the cooling block 22 and the thin plate base material 2 which are pressed inward and downward.

And, as shown in Figure 3, the cooling block 22 is up and down on the outer portion of the cylindrical base material 4 so as to maintain a shape wrapped along the circumference of the thin base material 2 and the cylindrical base material 4 brazed. It consists of two half arc-shaped cooling block (22a) (22b) which is positioned as, while the supply and discharge pipes (23a, 23b) for the inlet and outlet of the cooling water is connected to the end of the cooling block 22, respectively.

Next, in FIGS. 1 and 2, a predetermined angle θ and a thin plate 2 are provided on the gap adjusting member 30 which is horizontally rolled below the drive shaft 32 vertically installed to drive the motor at the end of the second horizontal stage 16. And the arc torch 40 fixed to the brazing section 3 of the pipe 4 at fixed intervals D and E. FIG.

That is, the drive shaft 32 is a rotary gear 32d meshing with the end drive gear 32c of the drive motor 32b provided on the gearbox 32a provided at the end of the second horizontal stage 16. It is provided in the box 32a, and it is installed so that it may drive as the said drive motor.

In addition, the gap adjusting member 30 is a fixed rod (30a) horizontally fixed to the upper side of the center adjusting block 60 to the lower portion of the drive shaft 32, through which the rotation of the adjustment piece (30b) installed in the rear end And a moving rod 30c installed to move back and forth through the fixed rod 30a, and a fixing plate 54 for angle adjustment of the torch 50 is fixed at the end of the movable rod 30c to fix the fixing jig 54a. do.

Next, FIGS. 1 and 2 show a wire 50 that is melted at the welded area 3 of the base material 2, 4 to braze the base material 2, 4, the wire 50. Is supplied through the center of the arc torch 40 as a feeder 52 installed on one side of the vertical base (12).

Next, FIG. 2 illustrates the center adjusting block 60, which is installed at the lower end of the drive shaft 32 and positioned inside the thin plate 2 fixed as the fixing member 20. Consists of a conical block that is inserted and supported to adjust the center to the center.

The thin plate and pipe arc brazing method of the present invention as an apparatus 1 having the above configuration will be described below.

As shown in FIGS. 1 to 3, the hydraulic unit 24 is operated between the upper and lower fixing blocks 20a and 20b of the second horizontal bar 16 so as to provide a half arc cooling block 22a therein. A thin plate 2 having a thickness of 0.8-1.2 t, preferably 1.0 t, is fixed between (22b), and then 36-40 φ preferably perpendicular to the support plate 4a inwardly of the thin plate 2. After inserting the pipe 4 having a diameter of phi and a thickness of 0.8-1.2t, preferably 1.0t, the hydraulic unit 24 is operated to fix the thin plate 2.

Next, the handle 16b of the vertical base 12 is rotated so that the conical center adjustment block 60 installed at the lower end of the drive shaft 32 of the second horizontal stage 16 is provided with the pipe 4 inside the thin plate 2. After being fixed in the center, the movable rod 30c of the gap adjusting member 30 provided in the lower portion of the drive shaft 32 is moved to the adjusting piece 30b and installed as a hinge 54a at the end of the movable rod 30c. An angle (θ) of 30 to 60 °, an interval D of 5-10 mm, and an interval of 1-10 mm (E) to the fixing jig 54 with respect to the brazing portion 3 of the thin plate 2 and the pipe 4. Fix the arc torch 40 to have.

Then, a voltage (V) of 14-20V, preferably 17V, and a current (A) of 40-120A, preferably 80A are applied to the arc torch 40, while 10-25 through the arc torch 40. l / min Preferably argon gas (G) which is a fluorinated gas is blown at a flow rate of 17 l / min, and the center of the arc torch 40 is supplied as the feeder 52 with the brazing section 3 surrounded. Supply a wire 50 having a diameter of 0.8-1.2t preferably 1.0t.

At the same time, the drive motor 32b is driven to drive the arc torch 40 fixed as the gap adjusting member 30 at the lower portion of the drive shaft 32, that is, the drive shaft 32 at a speed S of 18-60 cm / min. The brazing operation of the thin plate 2 and the pipe 4 is performed while rotating along the furnace brazing unit 3.

Then, at the beginning of the brazing operation, the supply and discharge pipes 23a and 23b connected to the cooling blocks 22a and 22b fixed as the fixing member 20 while being wrapped in a half arc shape on the upper and lower sides of the thin plate 2. Arc brazing operation of the thin plate (2) and the pipe (4) is performed in the state of cooling the thin plate base material (2) by flowing through the cooling water.

Hereinafter, embodiments of the present invention are as follows.

1 to 6, in the embodiment of the present invention, the thin plate 2 and the pipe 4, that is, the thin plate 2 forming the body of the fuel tank and the fillet portion of the pipe that becomes the inlet portion of the vehicle. The brazing operation is performed as arc welding instead of conventional gas (torch) welding, which is typically performed by arc welding while supplying and melting the wire 50 through the center of the arc torch 40, and at the same time fluorinated gas For example, MIG welding is one of arc welding that emits argon gas to surround the welding area and blocks contact with the atmosphere.

At this time, the thin plate 2 of the embodiment has a thin plate 2 having a thickness of 0.8-1.2t, preferably 1.0t, and preferably a diameter of 38-40 and a thickness of 0.8-1.2t preferably 1.0t. Arc brazing is carried out with the equipped pipe 4, which is the typical thickness and diameter of an automotive fuel cell.

On the other hand, in the arc brazing operation of the thin plate (2) and the pipe (4) uses a copper alloy wire (50) to suppress the occurrence of defects and to ensure a healthy arc brazing portion (3), which is a common torch Brass wires used in brazing chores cannot be used because they have a low melting point, and therefore, copper and copper-silicon alloy wires 50 having a high melting point and excellent thermal conductivity are used.

At this time, the important is the diameter of the wire 60 in the embodiment of the present invention uses a wire 60 having a diameter of 0.8-1.2 t, if the diameter of the wire 50 is smaller than 0.8mm, melt capacity On the contrary, it is impossible to completely fill the fillet joints. On the contrary, when larger than 1.2 mm, the amount of heat input increases, causing the thin plate 2 to melt, that is, to form a hole in the thin plate 2.

Next, the egg side spacing D between the tip 42 and the thin plate 2 of the arc torch 40 and the brazing portion 3 of the pipe 40 is 5-10 mm, preferably 7 mm, and the other side. The distance E is 1-10 mm, preferably 5 mm, while the angle θ between the arc torch 40 and the sheet and pipe brazing part 3 is 30 ° -60 °, preferably 45 °. It was.

At this time, if the distance (D) and the angle (A) is out of the above range, there is a problem that the normal bead is not formed because it is biased to either one of the thin plate (2) and the pipe (4), and eventually the healthy brazing part ( 3) is impossible to form.

Next, the arc torch 40 was brazed by applying a voltage (V) of 14-20V, preferably 17V, and a current (A) of 40-120A, preferably 80A. As shown in FIG. In the region of the voltage of 14V and the current of 40A or less (X region in FIG. 4), the transition of molten metal to the brazing part 3 between the thin plate 2 and the pipe 4 is insufficient in the amount of heat input in the form of a short circuit. It can be seen that holes are generated due to a plurality of melt defects. On the contrary, in the region of 20V voltage and 120A or more (Z in FIG. 4), a large amount of spatter is generated, as well as brazing. The surface condition of was poor, and in particular, the molten phenomenon that the hole was formed in the thin plate 2 or the pipe 4 occurred, and thus, normal brazing was impossible.

That is, in the Y region of FIG. 4, which applies a current of 40-120A and a voltage of 14-20 V to the arc torch 40, as the applied current and voltage increase in the form of GLOBULAR and SPRAY. It was found that metal migration occurred and complete fusion occurred.

Next, the rotational speed V of the torch 40 that melts the wire 60 to perform brazing, that is, the rotational speed V of the drive shaft 32 to which the torch 40 is fixed according to the driving of the driving motor 32b. Argon gas (G) having a flow rate of 18-25 cm / min and a flow rate of 10-25 l / min, preferably 18 l / min, at the same time of brazing was blown out before and after the brazing section 3, respectively.

That is, in order to prevent the coupling to the brazing part 3 when the rotational speed of the torch 40 is out of the range, the argon gas G is blown to surround the brazing part 3. The reason for this is to prevent the defects that occur at the starting point of the brazing and the overlapping end point (finishing position), which is the biggest problem when brazing. If it is lower than 10 l / min, the melting wire is cooled below a certain temperature during brazing. It was not possible to block the air contact of the brazing part 3 until it was, and on the contrary, when excessively ejected more than 25 l / min, argon gas was mixed in the melt and the welding state was poor.

Next, FIG. 5 and FIG. 6 show the state of the specimen by the conventional gas brazing operation and the state of the arc brazing operation of the present invention. In the case of FIG. Compared with the conventional heat affected zone, it can be confirmed that the formation is considerably less than 1/2, and in particular, the back surface is not damaged by overheating. In contrast, in the conventional case, as shown in FIG. It can be seen that the affected portion is considerably enlarged, and finally, through the brazing of the arc method of the present invention, it is possible to minimize the surface treatment damage of the thin plate and preserve the corrosion resistance or the inherent characteristics of the surface treatment.

Next, FIG. 6 illustrates the change of the tissue by the conventional gastorch (FIG. 6B) and the present invention, the arc brazing (FIG. 6A). In the case of the present invention, which is the arc brazing, the heat input is small and the coarsening of the tissue does not appear. It was found that the coarsening of the tissue was well represented when brazing by the torch.

Therefore, when the arc brazing method of the present invention is performed, the thermal deformation is small, so that cracks generated on the specimen, that is, the thin plate and the pipe, can be prevented in advance.

Thus, according to the arc brazing apparatus and method of the present invention thin plate and pipe, it is possible not only to automatically braze the pipe and the thin base material, that is, the billet (FILLET) portion of the base material, but also to minimize the amount of heat input heat deformation of the base material By minimizing this, the surface coating layer of the base material has the advantage of minimizing damage.

In addition, in the conventional torch brazing, the coarsening of the welded tissue is large due to overheating, but in the arc brazing method of the present invention, since the heating is minimized only in a limited range, the coarsening of the tissue is reduced to prevent thermal deformation or cracking of the base metal. It is effective to prevent.

Finally, by optimizing the parameters during brazing using the metal transition mode, it is possible to provide a superior effect of obtaining a more beautiful bead appearance by preventing fusion defects and minimizing spatter.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (4)

In sheet metal and pipe brazing apparatus, A base portion 10 having a first horizontal stage 14 installed in the center of the vertical base 12 and a second horizontal stage 16 installed to move up and down on the upper portion of the vertical base 12; A fixing member (20) having a cooling block (22) installed on the first horizontal plate (14) for cooling and fixing the thin plate (2); The brazing part of the thin plate 2 and the pipe 4 in the gap adjusting member 30 which is horizontally arranged in the lower part of the drive shaft 32 installed vertically to drive the constant speed S as a motor at the end of the second horizontal stage 16. An arc torch 40 fixed to a position at a predetermined angle θ and a predetermined interval D, and surrounded by a constant flow rate of argon gas G while a constant voltage V and a current A are applied thereto. ;Wow, A wire 50 having a constant diameter T that is supplied as a feeder 52 installed on one side of the vertical base 12 and is supplied through a center of the arc torch 40; And, And a center adjustment block 60 fixedly installed at the center of the pipe 4 positioned inward of the thin plate 2 fixed as the fixing member 20 at the lower end of the drive shaft 32. Arc brazing device for sheet and pipe The upper and lower fixing blocks of claim 1, wherein the fixing member 20 is a hydraulic unit 24 interposed on both sides, and is pressed upward and downward to fix the cooling block 22 and the thin plate 2 on the inner side. It consists of (20a) (20b), the cooling block 22 is composed of two half arc-shaped cooling blocks (22a, 22b) surrounding the pipe (4) and the cooling water supply and discharge pipes (23a) (23b) are connected Brazing device, characterized in that 2. The thin plate (2) and the pipe (4) have a thickness of 0.8-1.2t, a diameter (d) of 36-40φ and a thickness of 0.8-1.2t, wherein the arc torch 40 is The arc torch 40 is fixed to the spacing adjusting member 30 to have an angle θ of 30 to 60 °, an interval D of 5-10 mm on one side, and an interval E of 1-10 mm on the other side. A voltage (V) of 14-20V and a current (A) of 40-120A are applied, and the flow rate of the inactivated argon gas (G) which is ejected during the operation of the arc torch and surrounds the brazing part 3 is 10-25L. / min, the rotational speed (S) of the arc torch 40 by the drive shaft 32 is 18-60 cm / min, supplied as the feeder 52 through the center of the arc torch 40 Brazing apparatus, characterized in that the diameter (T) of the wire 50 is formed to be 0.8-1.2mm In the brazing method of thin plate and pipe, Pipe (4) having a diameter (d) of 36-40 φ and a thickness of 0.8-1.2t while operating the hydraulic unit (24) between the upper and lower fixing blocks (20a, 20b) of the second horizontal bar (16). Secures the thin plate 2 having a thickness of 0.8-1.2t located between the half arc-shaped cooling blocks 22a and 22b, Adjust the height of the second horizontal stage 16 of the vertical base 12 to adjust the conical center adjustment block 60 of the lower end of the drive shaft 32 installed at the end of the second horizontal stage 16 pipe (4) In the center of the 30 to 60 degrees of angle (θ) and 5 to 10 mm to the brazing portion 3 of the thin plate 2 and the pipe 4 as a fixing jig at the end of the spacing adjusting member 30 installed below the drive shaft 32. After fixing the arc torch 40 to have a spacing (D) and a spacing (E) of 1-10mm, Feed the wire 50 having a diameter of 0.8-1.2t as the feeder 52 through the arc torch 40, and blows argon gas (G) through the torch at a flow rate of 10-25 l / min brazing Surrounding part 3, Applying a voltage (V) of 14-20V and a current (A) of 40-120A to the arc torch 40, and flowing the coolant through the supply and discharge pipes (23a) (23b) of the cooling block (22). And brazing operation of the thin plate 2 and the pipe 4 by rotating the arc torch 40 along the brazing section 3 at a speed S of 18-60 cm / min by the motor-driven drive shaft 32. Arc brazing method of sheet and pipe, characterized in that performing