JP3083130B2 - Seam welding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam welding method used for joining two metal plates.

[0002]

2. Description of the Related Art Conventionally, when a plate joint portion formed by slightly overlapping two metal plate materials (work pieces) is sandwiched between a pair of rotating electrode wheels and seam-welded, generally, as shown in FIG. A seam welding machine main body 40 having a pair of rotating electrode wheels E1 and rotating electrode wheels E2; It is composed of

In this case, a jig device is movable with respect to a fixed welding machine main body, and a clamp / jig movable type in which a clamp / jig device 42 moves the work side to perform seam welding while moving the work side. Clamp for positioning and holding
The jig device 42 is of a fixed type, and there are two methods of an electrode moving type in which welding is performed while the welding machine 40 moves. In each of these cases, the traveling line of the rotating electrode wheels E1 and E2 is always advanced at the same traveling angle with respect to the welding line L.

Generally, in this seam welding, as described above, the running line of the electrode surface which is in contact with the tip of the electrode wheel always has a fixed positional relationship between the electrode wheel and the end of the metal plate of the lap joint as shown in FIG. Therefore, the flat pressing surface (a) at the tip of the electrode ring gradually wears and deforms as shown in FIG. 6 during repeated welding.

When the electrode wheel is used in such a deformed state, one side of the electrode surface comes into contact with the other plate as shown in FIG.

Therefore, in order to avoid this phenomenon, as shown in FIG. 8, the tip surface of the rotating electrode wheel is moved by a fixed amount in the left-right direction (electrode surface width direction) for each welding so as to make the amount of wear uniform. We have taken measures such as installing a shift device.

On the other hand, after the welding operation is performed at a certain number of times, before the deformation adversely affects the welding quality, cutting or polishing and shaping is performed by the cutting device until the electrode tip becomes a flat state including the tip. Have been.

[0008]

The problem to be solved by the present invention is that in the conventional seam welding used for plate joining, the relative position between the electrode running line and the end of the metal plate of the welding line is fixed. Therefore, the deformation of the electrode wheel must be corrected frequently by dressing, and the method of shifting the electrode wheel requires a complicated structure. Therefore, it is reasonable to reduce the consumption of the electrode wheel and simplify the welding equipment. It was difficult to promote it.

Recently, a so-called tailored blank material has been manufactured, in which a scrap of scraping is used for the purpose of reuse, or metal plates having different thicknesses and materials are butt-welded and integrated according to a function application. In the field, mash seam welding, which is considered to be more advantageous in terms of manufacturing cost than conventional laser welding and electron beam welding, has spread to practical use, and the seam welding method with less wear of the rotating electrode wheel has been improved. Has been attracting attention.

[0010]

Accordingly, the present invention has been developed in view of the above trend, and has taken the following technical means. That is, the lap joint portion formed by superposing the metal plate, sandwiched between a pair of rotating electrode wheels, while rotating drives the rotating <br/> rolling electrode wheels, the pressure and the welding current required to seam welding In the method of seam-welding the joint portion, an angle is provided in a relative position between a welding line of the joint portion and a traveling line of the rotating electrode wheel, and an electrode surface that comes into contact with a metal plate end of the rotating electrode wheel is formed. During the welding process from the welding start point to the welding end point of the joint portion, the joint portion is shifted in the direction of the electrode surface width (W) , thereby erasing the electrode surface.
Dispersing the wear amount in the electrode surface width (W) direction.
Sign .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a method according to the present invention.
It is a top view which shows the outline of the electrode moving type which provided the relative angle in the running line of FIG. FIG. 2 is a plan view showing the outline of the electrode moving type in which the welding line at the lap joint portion of the plate is provided at an angle with respect to the straight running line of the rotating electrode wheel.

As is well known, the rotating electrode wheels E1 and E2 used for seam welding are made in a disk shape from a copper alloy.
A flat tread is provided as an electrode surface on the circumference of the tip of the disk-shaped electrode wheel. In the case of performing seam welding by seam welding using the rotating electrode wheel, the two sheet materials S1 and S2 are firmly clamped and held with a slight overlap margin at opposing ends by a clamping device. The distance between the welding start end and the welding end end of the butted portion held by the clamp is sandwiched between the pair of rotating electrode wheels E1 and E2 while being rotationally driven.
During that time, the welding is performed by applying the welding pressure and welding current necessary for welding.

The basic structure of the mash seam welding is the same as that of the above-described seam welding. However, in the case of the mash seam welding, a large pressing force is literally applied between the electrodes to smooth the overlap margin. Proceed with seam welding.

The width of the welding line is smaller than the width (W) of the electrode surface at the tip of the electrode wheel. In consideration of the width of the welding line, the jig device is provided with an advancing angle α or β obtained from the welding length so that it can be within the width (W) of the electrode surface at the tip of the electrode wheel in one welding operation. Alternatively, by moving the welding machine body, the pressurizing surface (a) that contacts the metal plate end of the electrode surface within the allowable range of the electrode surface width (W) at the electrode tip from the welding start end to the welding end end. ) Will move. In other words, the above-described disadvantage that the relative position between the tip end of the electrode wheel and the welding line does not always coincide and be fixed does not operate.

Further, since the rotating electrode wheel is worn, the length of the welding line and the corresponding electrode ring circumference cannot be matched, which means that in the next welding cycle, the same welding step on the previous welding line is performed. The trace cannot be stepped on by the tip of the electrode wheel.

That is, by providing a small angle between the welding line and the relative position of the jig device or the traveling line of the welding machine, the consumption of the electrode surface can be evenly distributed in the electrode surface width (W) direction. Will be possible.

FIG. 3 shows, in the electrode running line of FIG. 1A, a pressing surface (a) of an electrode surface which is in contact with the end of the metal plate of the overlapped joint during the running process of the pair of rotating electrode wheels E1 and E2. 4A and 4B are schematic views showing a state in which (a) sequentially moves in the electrode surface width (W) direction from the welding start point to the welding end point.

In this case, the running line of the pair of rotating electrode wheels E1 and E2 is provided with a small angle α or a small angle β with respect to the welding line L of the lap joint, and the pair of rotating electrode wheels E1 and E2 is provided. Moves forward on the A line or the B line in FIG.

FIG. 3A shows a pair of rotating electrode wheels E1,
The rotating electrode wheel E2 is inserted into the welding start end of the lap joint with the top and bottom open. In (B), the starting point is pressed by a pair of rotating electrode wheels E1 and E2. (C) and (D) The pressing surfaces (a) and (b) of the electrode surface at the tip of the electrode wheel are sequentially shifted in the width (W) direction of the electrode surface, that is, to the left in the A line. (E) shows the movement position of the pressing surfaces (a) and (b) at the position where the pair of rotating electrode wheels E1 and E2 reach the welding end.

In this manner, the electrode running line is provided with a small angle, and the pressing surface (a) in contact with the end of the metal plate on the electrode surface,
By shifting (a) in the electrode surface width (W) direction, it is possible to uniformly disperse the electrode surface deformation due to the welding beat generated between the electrode wheels in the electrode surface width (W) direction at the electrode wheel tip. .

[0021]

As described above, according to the seam welding method of the present invention, by providing a very small angle in the relative position between the traveling line of the rotating electrode wheel and the welding line of the lap joint, the rotation can be achieved. The pressing surface of the electrode wheel does not step on the same trace of the previous welding line, that is, the end of the metal plate, and the amount of wear locally generated at the tip of the electrode wheel can be greatly reduced. Therefore, the conventional electrode shift device is not required, and the number of times of dressing the electrode wheel can be reduced, thereby reducing the cost of the seam welding equipment and extending the life of the electrode wheel.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an electrode moving type in which a running line of a pair of rotating electrode wheels is provided at an angle with respect to a welding line L formed at a lap joint portion of a metal plate according to an embodiment of the present invention. FIG.

FIG. 2 is a plan view schematically showing an electrode moving type in which a welding line L formed at a lap joint portion of a plate member is formed at an angle with respect to a straight running line of a rotating electrode wheel.

FIG. 3 is a diagram showing the electrode running line of FIG. 1A. During the running process of the rotating electrode wheel, the pressing surface (a) of the electrode surface in contact with the end of the metal plate of the lap joint portion starts from the welding start point during the welding process It is the schematic which shows the transition which moves sequentially in the electrode surface width (W) direction until the welding end point.

FIG. 4 is an explanatory view showing the principle of seam welding of a conventional plate joint.

FIG. 5 is a cross-sectional view of the tip of the electrode wheel showing the positional relationship between the pressing surface (a) of the electrode surface of the rotating electrode wheel and the end of the metal plate of the lap joint by the conventional seam welding method of the plate joint.

FIG. 6 is a cross-sectional view of the tip of an electrode wheel showing abrasion and deformation of a pressing surface of an electrode surface of a rotating electrode wheel by a conventional seam welding method of a plate joint.

FIG. 7 is a cross-sectional view of an electrode tip in which a lap joint is pressurized with a worn and deformed rotating electrode wheel by a conventional plate seam welding method.

FIG. 8 is a cross-sectional view of an electrode tip when a rotating electrode wheel is shifted by an electrode shift device in a conventional seam welding method of a plate joint.

[Explanation of symbols]

S1 ... Metal plate E1 ... Rotating electrode wheel S2 ... Metal plate E2 ... Rotating electrode wheel L ... Welding line (end of metal plate) (a) ... Pressing surface of electrode surface W・ ・ ・ Electrode surface width

Claims (1)

(57) [Claims] The method according to claim 1] lap joint portion formed by superposing the metal plate, sandwiched between a pair of rotating electrode wheels, while rotating drives the rotating electrode wheel, giving pressure and the welding current required to seam welding In the method of seam welding the joint,
An angle is set in a relative position between the welding line of the joint portion and the traveling line of the rotating electrode wheel, and an electrode surface in contact with an end of the metal plate of the rotating electrode wheel is moved from a welding start point of the joint portion to a welding end point. In the direction of the electrode surface width (W) during the welding process up to
And thereby reduce the amount of wear on the electrode surface by the
A seam welding method characterized by dispersing in a pole width (W) direction .