JPS5921266B2 - Teig welding method - Google Patents

Description

[Detailed description of the invention] 1111 The present invention relates to a Teig welding method.

With the conventional Teig welding method, for example, when welding a flat plate (approximately 0.2 to 0.3 nm thick) to a pipe (O, 5 liters thick), when the pipe is inserted into the backing metal, the welding position of the pipe changes. After making a cutout hole that almost matches the top surface of the backing plate and installing the pipe inside, place a flat plate on top of the backing plate and press it down with a presser foot. A torch is used to weld the contact line (welding line) between the flat plate and the pipe. However, in order to perform good welding, it is necessary to keep the amount of welding heat constant, and for this reason, it is necessary to keep the distance between the workpiece and the torch electrode constant. Therefore, a highly accurate feeding mechanism is required, and especially when the welding distance is long, there is a drawback that it takes a long time for the operator to set the welding distance in order to maintain a constant distance over the entire area. In addition, the part of the material to be welded expands due to the welding heat, but in the conventional method, it is held down with a presser metal fitting, so it is not possible to release the elongation due to this expansion. , the welded part of the material to be welded lifts up, and the contact between the flat plate and the pipe becomes poor.As a result, only the flat plate is heated without heating the pipe, which creates a melt hole in the flat plate, making it difficult to obtain a good weld. There is also a drawback. The present invention solves these drawbacks, and by cooling the area around the welding line during welding, the cross-sectional shape of the arc is elongated in the direction of the welding line, thereby increasing the welding effect and creating a slope on the backing metal surface. The purpose of this is to enable better welding.

EMBODIMENT OF THE INVENTION Hereinafter, the structure and operation of the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a structural diagram of an example of an apparatus for carrying out the present invention as seen from the welding line direction, and FIG. 2 is a structural diagram showing a part of the left side of FIG. 1. Figure 6 is an explanatory diagram showing the positional relationship of the joint parts, Figure A is a plan view showing the positional relationship of the objects to be welded and the welding line, the opening of the figure is a sectional view taken along line V-V in Figure A, and Figure C is the welded object. It is a perspective view which shows the positional relationship and welding line when an object is set in a backing metal. In the figure, reference numeral 1 denotes a back metal plate, which has a cut-out hole in its upper center into which a pipe 4, one of the materials to be welded, is inserted and set, and a pulley for running the rail 2 is installed below it. have. The upper surface of the back cover 1 is sloped so that the center part is lower, and the back cover 1 is positioned so that the center part of the flat plate 3 contacts the upper end of the pipe 4.
A flange portion 16 into which the flat plate 3 is fitted is provided near both ends of the upper surface. 2 is a rail, and 3 is a flat plate which is the other welding material and is fitted between the flange portions 16 of the back cover 1 and placed on the back cover 1 so as to be in contact with the pipe 4 at its center.

Reference numeral 5 is a fixed frame that is integrated with a column fixed to the ground, and has a through hole with a female screw in the center thereof, and a shaft with a male screw attached to the handle 15 is screwed into the through hole, and the other side It protrudes to the side.

A pressure member 6 is fixed to the tip of the protruding portion of the shaft. Further, the pressure member 6 is provided with a hole on the opposite side of the fixed portion thereof, and is slidably engaged with a shaft 8 attached to the movable member 7. 9 is a pressure member 6 and a movable member 7
This is a spring inserted between the

An arm 11 is fixed to the movable member 7 in the direction of the welding line in FIG. 6, and a torch 13 is attached to the arm 11 by a mounting member 12. The distance between the plate 3 to be welded and the tip of the torch can be adjusted by adjusting the attachment position of the torch 13 to the arm 11. Movable member 7
Further, protrusions are provided on both sides of the torch position so as to be parallel to the weld line in FIG. 6, and a pressure roller 10 is rotatably attached to the protrusions. In order to reduce the contact area with the material to be welded, the pressure roller 10 has a tapered circumferential surface as shown in the figure. 14 is a lead wire for the torch.

With the above configuration, when welding the pipe 4 to the flat plate 3,
The pipe 4 is set on the back cover 1, and the flat plate 3 is fitted between the flanges 16 and placed on the upper surface of the back cover. Thereafter, when the handle 15 is rotated clockwise, the spring 8 is compressed downward by the pressure member 6. Therefore,
A pressure roller 10 presses the flat plate 3 via the movable member 7.
At this time, the handle 15 is operated so that the pressure applied by the roller 10 becomes an appropriate pressure for welding. Thereafter, the distance between the tip of the torch 13 and the flat plate 3 is adjusted by selecting the mounting position of the mounting member 12 to the arm 11 so that the distance is optimal for welding. In this state, the direction from one end of the flat plate to the other end (
While moving the backing metal 1 on the rail 2 in the direction of the welding line 20), the flat plate 3 is sequentially welded by heating it from above along the welding line 20 with the torch 13 (because the flat plate 3 is thin, Even if the pipe is heated from above, the heat reaches enough to reach the pipe 4 and weld it.) (Also, at this time, of course, the torch should be adjusted in advance so that the welding line (Fig. 6, 20) is directly below the torch. ) Therefore, the distance between the roller tip and the torch tip to the flat plate is always constant during welding, so the distance between the flat plate and the torch tip is automatically kept constant, and as a result, the amount of welding heat is constant. Then,
Good welding is possible. In addition, since the two rollers 10 press the flat plate through point contact, there is no distortion due to thermal expansion of the material to be welded, unlike when using a conventional presser foot, and from this point of view, good welding can be achieved. becomes possible. Third
Figure A is a front view of welding using a pressure roller that is cooled according to the present invention. That is, as shown in the figure, the side of the pressure roller 10 opposite to the welding material side (the upper part of the pressure roller) is cooled with cooling gas 21. When the flat plate 3 is welded while being pressed by the cooled pressure roller near both sides of the torch 13 as shown in the figure, the welding arc cross section 28 becomes as shown in the figure 3 by the cooling of the pressure roller 10. As shown in , the thermal pinch effect creates an elongated shape along the weld line. Therefore, the welding line is concentrated only in the very vicinity of the welding line, and the welding effect and welding speed can be further enhanced. Furthermore, if a high-frequency pulse power source is used as a welding power source, in addition to the thermal pinch effect, the electromagnetic pinch effect and molten metal excitation effect by the power source are added, making it possible to perform even more effective welding. Further, since the pressure roller 10 is cooled with cold air, the structure of the cooled pressure roller is simple, and there is no need to worry about water leakage as in the case of water cooling. Further, FIGS. 4 and 5 are explanatory diagrams showing the positional relationship between the welded material and the back metal according to the present invention,
All symbols indicate the same parts as in FIG. In other words, if the surface of the backing metal 1 is a horizontal surface, and welding is performed by placing the flat plate 3 horizontally on the pipe 4 so as to roughly follow that surface,
In order to make complete contact between the flat plate 3 and the pipe 4 on the weld line, it is difficult to make contact unless a relatively strong force is applied to the roller 10 to push the flat plate 3. Especially when the width of the flat plate 3 is wide, welding distortion occurs. It is easy to press, and if pressed with too much force, the welded surface may be cut. Therefore, if the pipe 4 is made to protrude above the surface of the backing metal 1 and the flat plate 3 is placed on top of it as shown in FIG. 4A, even if the force of the roller 10 is weakened, Distortion is less likely to occur. However, as shown in Figure 4, a space that is not welded (a non-contact area between the flat plate and the pipe) tends to occur in the center of the welded portion between the flat plate and the pipe. Therefore, in the present invention, as shown in Fig. 5, the surface of the back metal plate 1 is sloped so that the central part is lower, and the flat plate is welded with the flat plate slightly curved downward. . If welding is performed in such a state, even if the roller 10 is pressed with a relatively weak force, distortion and the above-mentioned space (non-contact area between the flat plate and the pipe) will not occur, and good welding will be possible. As described above, the present invention provides the excellent effect of enabling extremely good Teig welding with a simple device without requiring complicated adjustments.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram showing an example of a device for carrying out the present invention;
FIG. 2 is a structural diagram showing a part of the left side of FIG. 1, and FIG. 3 is a front view and a plan view showing the arc shape when a cold air cooling pressure roller is used.

Claims (1)

[Claims] 1. When welding the flat plate 3 to the pipe 4, provide a cutout hole in the center of the backing plate 1 to insert the pipe 4,
A slope is provided on the surface of the backing plate 1 so that the central part is lower, and after inserting the pipe 4 into the cutout hole, the flat plate 3 is placed on top of the pipe 4, and the torch and integral structure are placed on the left and right sides of the torch 13. A Teig welding method characterized in that welding is performed while applying pressure with a pressure roller 10 provided so as to