JPH01228674A - Welding method - Google Patents

Abstract

PURPOSE:To perform accurate welding even when there is the large difference in plate thickness between both plates by superposing the thin plate on the thick plate and performing welding of an end of the thin plate exposed from a presser tool to a part of the thick plate by using a plasma arc while the thin plate being pressed from above by the presser tool. CONSTITUTION:The Al thin plate 3 is pressed on the Al thick plate 2 by the presser tool 8 by a pressure press 9 and both plates are stuck together. A switch of a welding power source 5 is charged and torch 10 for plasma arc welding is fitted to the position of the end 7 of the Al thin plate 3 and the plasma arc is projected and the end of the Al thin plate 3 exposed from the presser tool 8 and a part of the Al thick plate 2 are molten and stuck together. The torch 10 for plasma arc welding is moved at a proper speed and welding is performed continuously. Since the presser tool 8 is made of stainless steel having the melting point higher than Al, it is not molten. By this method, since a melting unnecessary part of the thin plate is covered by the presser tool, even when the plate thickness of the thin plate and the thick plate is thick, the accurate welding can be easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a welding method for joining a thin metal plate and a thick metal plate.

[Conventional technology]

FIGS. 5 and 6 are cross-sectional views showing a conventional welding method, in which a thin aluminum plate and a thick aluminum plate, such as those used for transformer coils and lead leads, are joined together.

In Figure 5, (1) is a plate-shaped ground electrode, (2) is an aluminum plate placed on the ground electrode (1), and (3) is placed on top of the aluminum plate (2). Aluminum thin plate, (4)
is an arc spot welding torch, and (5) is a welding power source electrically connected to the arc spot welding torch (4) and the earth electrode (1), respectively.

First, turn on the switch (not shown) of the welding power source (5), then press the arc spot welding torch (4) against the thin aluminum plate (3) so that the thin aluminum plate (3) The thin aluminum plate (3) and the thick aluminum plate (1) are joined by performing arc spot welding as many times as necessary to balance the current carrying capacity of the joint and the amount of current flowing through the joint.

FIG. 6 shows a case in which two aluminum thin plates (3) are used in a stacked manner, and since the parts other than the aluminum thin plates (3) are the same as in the case of FIG. 5, the explanation will be omitted. If multiple thin aluminum plates (3) are stacked and welded together to the thick aluminum plate (2), the welding will be uncertain, so shift the aluminum thin plates (3) one by one.
- Weld directly to aluminum thick plate (2) one by one.

[Problem to be solved by the invention]

Since the conventional welding method is configured as described above, it is necessary to have many welding points for arc spot welding, which takes a long welding time. There is a problem in that welding is difficult when the thick plate is thick or when there is a large difference in thickness between the thin plate and the thick plate.

This invention was made to solve the above-mentioned problems, and it can shorten the welding work time, and can be used when the thickness of thin and thick plates is large, or when the thickness of the plate is different between thin and thick plates. The purpose of the present invention is to obtain a welding method that can reliably weld even when the

[Means for Solving the Problems] The welding method according to the present invention involves stacking a thin plate on a thick plate,
While pressing the thin plate from above with a presser, the ends of the thin plate exposed from the presser and a part of the thick plate are melted by plasma arc.

[Effect]

The welding method in this invention does not melt the edges and thickness of the thin plate.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a perspective view showing a welding method according to an embodiment of the present invention.
FIG. 2 is a sectional view thereof. In the figure, (1) is a plate-shaped earth PL pole, (2) is a thick aluminum plate placed on the earth electrode (1), (6) is the end of this thick aluminum plate (2),
(3) is a thin aluminum plate placed over the thick aluminum plate (2), (7) is the end of the thin aluminum plate (3), and the thick aluminum plate (
It is set back from the end (6) of 2). (8) is a stainless steel presser placed on top of the thin aluminum plate (3), and is set back so that the edge (7) of the thin plate (3) is exposed by the width required for melting. . (9) is the presser tool (8
), α1 is a plasma arc welding torch, (5) is a plasma arc welding torch (10
and a welding power source electrically connected to the earth electrode (υ).

First, the presser foot (8) receives the force from the pressure press (9).
Press the thin plate (3) against the thick plate (2) by pressing both (3)
, (2) are brought into close contact. Next, turn on the switch (not shown) of the welding Wl source (5), align the plasma arc welding torch α with the end (7) of the aluminum Wk plate (3), and irradiate the plasma arc. The end (7) of the thin aluminum plate (3) exposed from the presser (8) and a part of the thick aluminum plate (2) are melted and welded. While continuously irradiating the plasma arc, use the plasma arc welding torch αQ at a speed suitable for melting the end (7) of the aluminum plate (3) and a part of the thick aluminum plate (2). By moving, welding is performed continuously. The edge (7) of the Al Z 1g plate (3) that needs to be melted is melted, and the part of the thin aluminum plate (3) that does not need to be melted is covered with the presser (8) and is not melted by the heat of the plasma arc. This prevents such defects, so welding can be performed reliably. Note that the presser (8) is made of stainless steel, which has a higher melting point than aluminum, so it will not melt.

FIG. 3 is a sectional view showing a welding method according to another embodiment of the present invention. In the figure, two aluminum thin plates (3) are used in a stacked manner, and since the parts other than the aluminum thin plates (3) are the same as the embodiments of FIGS. 1 and 2, the explanation will be omitted. Align the two thin aluminum plates (3) with their ends (7) and place them on the thick aluminum plate (2).
), and the ends (7) of the two thin aluminum plates (3) and a part of the main thick aluminum plate (2) are simultaneously melted and welded. In this example, a plurality of Al thin plates (3) are melted at the same time,
Since welding is carried out, the effect of shortening the welding operation time is greater than that of the conventional example shown in FIG.

FIG. 4 is a sectional view showing a welding method according to still another embodiment of the present invention. By giving the shape of the earth electrode (1) a scent, or the earth electrode (smoothed), the other parts are the same as the embodiment shown in Fig. 3, so the explanation will be omitted. The edge of the thin aluminum plate (3) (
7) and a part of the thick aluminum plate (2) are not washed away along the surface of the thick aluminum plate (2), which has the effect of making it easier to obtain reliable welding.

Although the stainless steel presser (8) was used in the above example, it may be made of other metal or a solid material other than metal as long as it has a higher melting point than the thin or thick metal plate to be welded. Good too.

〔Effect of the invention〕

As described above, according to the present invention, the welding work can be performed continuously, so the welding time can be shortened, and plasma arc welding, which has high heat concentration, is used to cover the parts of the thin plate that do not need to be melted with a presser. Since the welding is carried out by the welding process, even if the thickness of the thin plate and the thick plate is large, or even if the difference in thickness between the thin plate and the thick plate is large, reliable welding can be easily achieved.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a cross-sectional view, respectively, showing a welding method according to one embodiment of the present invention, FIG. 3 is a cross-sectional view showing a welding method according to another embodiment of the present invention, and FIG. 4 is a further A sectional view showing a welding method according to another embodiment, and FIGS. 5 and 6 are sectional views showing a conventional welding method. In the figure, (2) is a thick aluminum plate, (3) is a thin aluminum plate, (6) is an end of the thick aluminum plate, (7) is an end of the thin aluminum plate, and (8) is a presser. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a welding method for joining a thin metal plate and a thick metal plate thicker than the thin plate, the thin plate is placed on top of the thick plate, and the end of the thin plate is set back from the end of the thick plate. A presser whose melting point is higher than that of the thin plate and the thick plate is stacked on top of the thin plate with the end of the thin plate that will become the molten part exposed, and the presser is used to hold the thin plate against the thick plate. A welding method in which the end portion of the thin plate and a part of the thick plate are melted and welded by a plasma arc while being pressed against the plate.