JPS61140382A - Electric resistance welding method of metal laminated plate - Google Patents

Abstract

PURPOSE:To reduce the equipment cost and to increase the workability by allowing to contact a conductive pressure backing plate with a pressure backing electrode and allowing to contact a metal face of a metal laminated plate with the pressure backing plate via a conductive auxiliary block. CONSTITUTION:A pressure backing plate 3 is formed by the material of high conductive steel, etc. and touched electrically and mechanically respectively on a pressure backing electrode 2 and the finish treated face 7 of surface finish treated plate 6. The auxiliary pressing block 4 to touch electrically on the metal face having conductivity of the plate 6 and to touch the rising part of the pressure backing plate 3 is arranged. The electrification of a spot welder is performed with this composition by touching the metal face of the plate 6 and a body 5 to be welded by a movable electrode 1. Because of the diversion of conventional spot welder being enabled with this method, the equipment cost is reduced and the workability is further improved by the simplification of work.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a polyvinyl chloride metal laminate in which polyvinyl chloride is laminated or coated on a metal plate, or a metal laminate in which a non-conductive material is laminated or coated (hereinafter referred to as This relates to electric resistance spot welding machines for surface-finished plates.

(Prior art) Surface-treated plates allow for processing such as bending, drawing, punching and cutting, and in the case of steel plates, they also provide anti-corrosion treatment, so they adhere closely to the base metal plate. Polyvinyl chloride, which has no conductivity, is often used for surface finishing because of its properties and processing performance as a laminate.

Conventionally, when trying to weld together these types of surface-treated plates, or for example, a surface-treated plate on one side and a steel plate on the other, because one side is an insulating material, general electric resistance spot welding (hereinafter referred to as spot welding) is used. ) cannot be welded without damaging the appearance quality of the surface treated area. For this reason, the conventional method for welding these surface-treated plates is to use a specially developed spot welding machine.

Figures 2 and 3 illustrate these conventional spot welding methods.
The figure shows a spot welding method using a special machine.

In Fig. 2, 11 is a movable electrode, 12 is a pressure receiving electrode, 13 is one welded object, 14 is the other welded object, arrow 15 is the pressure direction of the movable electrode, and dotted arrow 16 is the current direction. Indicates flow direction. In the conventional spot welding method shown in FIG. 2, the current flows through each of the objects 13 and 14 to be welded, thereby impairing the appearance quality of the surfaces of the objects 13 and 14.

In FIG. 3, 21 is a movable electrode, 22 is a presser electrode, and 23 is a movable electrode.
is a pressure receiving plate, 24 is one of the welded objects, δ is the surface-finished plate of the other welded object, 26 is its finished surface, arrow 27 is the direction of pressure applied by the movable electrode, and arrow 28 is the applied pressure of the presser/electrode. The dotted line arrow 29 indicates the direction of current flow.

In the method using a dedicated shield shown in FIG. 3, the current passes through the metal part of the surface-finished plate 25,
t-No damage.

(Problem to be solved by the invention, Misaki: As mentioned above, there is a method of using a special machine shown in Fig. 3 as a method that does not damage the finished surface due to the conventional spot overlap of metal laminates, but this In addition to requiring a large investment in equipment, there is a problem in that the processing work is inefficient because it is not a general-purpose equipment.

Therefore, the purpose of the present invention is to solve the above problem by using a pair of pressure receivers, and to electrically bond surface-treated plates using a normal spot welder to achieve the same joining performance as a dedicated spot welder. Our goal is to provide resistance spot welding machines.

(Means for Solving the Problems) The method of the present invention applies to a pressure receiving electrode of an electric resistance spot welding machine for a metal laminate plate in which a non-conductive material is laminated on only one side of the metal plate. A conductive pressure receiving plate is electrically and mechanically contacted, and the non-conductive material surface of the metal laminate is opposed to the pressure receiving electrode with respect to the conductive pressure receiving plate, and the metal is placed on the conductive pressure receiving plate. A laminate is arranged, a conductive auxiliary holding block is electrically and mechanically contacted with the pressure receiving plate and the metal plate surface of the metal laminate, and the object to be welded is electrically and mechanically brought into contact with the metal surface of the metal laminate. The metal surface of the object to be welded is welded to the other side of the metal surface.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

In FIG. 1, a pressure receiving electrode 2 is located opposite a movable electrode 1 of a spot welding machine. The object to be welded 5 is in contact with the conductive surface of the surface finishing plate 6 of the other object to be welded. In the figure, the object to be welded 5 has a protrusion in a portion to facilitate welding, but this is not a necessary condition. Reference numeral 7 indicates the finished surface of the surface-finished plate 6.

The pressure receiving plate 3 is made of a highly electrically conductive material, such as copper, and is in electrical and mechanical contact with the pressure receiving electrode 2 and mechanically with the finished surface 7 of the surface-finished plate 6. Further, the pressure receiving plate 3 is L-shaped, and the rising portion thereof protrudes so as to wrap around the surface finishing plate 6 on the movable electrode side. The surface-finished plate 60 is made of a highly electrically conductive material such as steel so as to be in electrical and mechanical contact with this protruding portion and to be in electrical and mechanical contact with a conductive surface that is not subjected to surface finishing treatment. Position the created auxiliary presser block 4.

Reference numeral 8 indicates the direction in which the movable electrode 1 is pressed.

With this structure, when current is applied by a spot welding machine, the current flows in the direction of the dotted arrow 9, so that the object to be welded 5 and the surface-finished plate 6 are welded at the protruding portions according to the same principle as normal spot welding.

In this example, an L-shaped additional ball receiving plate 3 is placed on the pressure receiving electrode 2 side.
However, an embodiment in which these positional relationships are reversed, that is, the pressure receiving plate 3 shown in the figure can be positioned on the movable electrode 1 side.

In this embodiment, a detailed description has been given of an example in which one of the objects to be welded is a surface-finished plate 6 and the other is a metal plate 5, but a surface-finished plate is used in place of the other metal plate 50, and this surface-finished surface is welded. It is clear that if the protrusion is arranged on the side where the protrusion is placed, a large amount of current will flow through the protrusion, destroying the non-conductive portion of the surface finish, and welding that is exactly the same as in the embodiment described will be possible.

(Effects of the Invention) By configuring the present invention as described above, it is possible to perform welding with the same performance as a dedicated spot welding machine by ordinary spot welding without using special equipment, thereby improving the efficiency of equipment investment. It has the effect of having high workability as well as high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing welding using a normal spot welding machine, and FIG. 3 is a diagram showing welding using a special spot welding machine.

Claims (1)

[Claims] In an electrical resistance welding method for a metal laminate in which a non-conductive material is laminated on only one side of the metal plate, a conductive pressure receiving plate is brought into electrical and mechanical contact with a pressure receiving electrode of an electrical resistance spot welding crosspiece. placing the metal laminate on the conductive pressure receiving plate with the non-conductive material surface of the metal laminate facing the pressure receiving electrode with respect to the conductive pressure receiving plate; bringing a conductive auxiliary presser block into electrical and mechanical contact with the metal plate surface of the metal laminate; bringing a welded object into electrical and mechanical contact with the metal surface of the metal laminate; A metal laminate, characterized in that the metal laminate and the object to be welded are welded by electrically and mechanically applying a movable electrode of the electric resistance spot welding machine to a surface opposite to the surface in contact with the surface. Electric resistance welding method for plates.