Friction spot joining method

A joint method and friction point technology, which is applied to welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., can solve the problems of corrosion resistance decline, and achieve the suppression of corrosion resistance decline, not easy to slide, and restrain the joining time lengthening effect

Inactive Publication Date: 2008-03-26
MAZDA MOTOR CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the rotating tool is rotated from the surface of the plated steel sheet and pushed while rotating, the metal plating layer will melt and evaporate, and as a result, the corrosion resistance of the plated steel sheet will decrease.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment -

[0053] Next, examples of the present invention will be described.

[0054] (joint unit)

[0055] The engaging unit is a fixed-position pressurizing unit in which the pressing shaft motor is a servo motor.

[0056] The rotary tool was made of ceramics; the diameter of the shoulder portion of the rotary tool was 10 mm; the diameter of the pin portion of the rotary tool was 3 mm, and the length of the pin portion was 1.27 mm.

[0057] (steel plate)

[0058] The first steel sheet was a 980 MPa-class high-tensile steel sheet (JIS (Japanese Industrial Standard) 3135 SPFC980Y) having a thickness of 1.0 mm. The composition of the first steel sheet was set as shown in FIG. 3 .

[0059] The second steel plate was set as a 270 MPa grade mild steel plate. Carry out alloying treatment after galvanizing on the second steel plate, make this second steel plate that has galvanized become coating unit area mass 55g / m 2 , Alloyed molten zinc-coated steel plate with a thickness of 0.7mm. Th...

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Abstract

A plurality of steel plates including at least one first non-coated steel plate (W1) and at least one metal-coated steel plate (W2) are prepared. The plurality of steel plates are overlaid in such a fashion that at least one of the two steel plates located on the respective sides in the overlaying direction is the first non-coated steel plate. A rotary tool (7) is rotated and allowed to press a to-be-joined part of the plurality of overlaid steel plates from the first non-coated steel plate side to friction-spot-join the to-be-joined part in a solid state by causing plastic flow at the to-be-joined part by generated frictional heat. Whereby, both elongation of time required for joining and lowering of the corrosion resistance of the metal-coated steel plate are suppressed. Whereby, both elongation of time required for joining and lowering of the corrosion resistance of the metal-coated steel plate are suppressed.

Description

technical field [0001] The present invention relates to a friction point joining method. Background technique [0002] Heretofore, as a method of point-joining a plurality of steel plates, which are stacked in the thickness direction, for example, as a workpiece for an automobile body, a method is known in which the stacked plates are sandwiched by copper electrodes. A resistance spot welding method in which the parts to be joined of a plurality of steel plates are connected and energized, and the resistance heating caused by this is used to join the said parts to be joined. [0003] In the past, people used mild steel as the steel plate for the body, but in order to reduce the weight of the car, people tend to use high-tensile steel plate. [0004] However, in this method, for example, when three or more steel plates including a mild steel plate and a high-strength steel plate are joined together, it is difficult to obtain the desired spot weld nugget. [0005] In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K101/16B23K103/04
CPCB23K20/1265
Inventor 玄道俊行
Owner MAZDA MOTOR CORP
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