Unlock instant, AI-driven research and patent intelligence for your innovation.

Resistance spot welding method

A technology of resistance spot welding and electrode pair, applied in resistance welding equipment, welding equipment, welding medium, etc., can solve the problems of great influence of shunt, adaptive control not working, etc.

Active Publication Date: 2018-08-31
JFE STEEL CORP
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In addition, the techniques of Patent Documents 1 to 3 are all effective for changes in the wear of the tip of the electrode, but no research has been done on the situation where the influence of shunt flow is large, such as when the distance from the welded point is short, and there is actually no adaptive control. work situation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Resistance spot welding method
  • Resistance spot welding method
  • Resistance spot welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] A steel material (270 MPa) having a thickness of 1.6 mm was prepared as a workpiece to be welded. Furthermore, both the test welding and the actual welding are performed by dividing the energization mode into two stages.

[0088] In the above-mentioned method, two workpieces to be welded are overlapped, and preliminary welding is carried out by constant current control in a state where there is no gap and no flow to the welded point, and the welding conditions for obtaining an appropriate nugget diameter are obtained. The welding machine uses an inverter DC resistance spot welder, and the electrode uses a chrome-copper electrode with a DR-shaped front-end diameter of 6mm. As a result, the welding conditions of the test welding set the first stage as applied force: 3.5kN, welding current: 7.0kA, energization time: 5cyc, set the second stage as applied force: 3.5kN, welding current: 9.0kA, Power-on time: 13cyc. It should be noted that, in this specification, the energiz...

experiment example

[0103] Next, the plate group in which the two thin steel plates were superposed as shown in Table 1 was subjected to resistance spot welding under welding conditions to manufacture welded joints. It should be noted that test welding was performed under the conditions shown in Table 1 without welded spots. The actual welding was carried out under the conditions shown in Table 1. It should be noted that the "two-stage adaptive control" in the "control method of formal welding" in Table 1 is the method of formal welding described in the above-mentioned embodiment 1, the "constant current control" is the method described in the above-mentioned comparative example 1, and " "Level 1 Adaptive Control" is the actual welding method described in Comparative Example 2 above.

[0104] With regard to the obtained welded joint, the welded portion was cut, and the cross-section was etched, followed by observation with an optical microscope to measure the nugget diameter. will get (t: thi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

An object of the present invention is to provide a resistance spot welding method capable of obtaining an appropriate diameter without increasing the energization time or causing dispersion even under special welding conditions. The present invention is a resistance spot welding method in which the energization pattern is divided into two or more multi-level steps to perform test welding and regular welding. In the test welding, a constant current with a different current value is used for each step, and each The time change of the instantaneous calorific value per unit volume and the cumulative calorific value per unit volume are stored as target values. In the formal welding, in any step, the time change of the instantaneous calorific value per unit volume is obtained from the actual results of the test welding When there is a deviation, the energization amount is controlled so as to compensate for the deviation during the remaining energization time of the step. In the test welding, when the current value of the first step is Ia, and the current value of the second step and later is Ix, Satisfy 0.3×Ix≤Ia

Description

technical field [0001] The present invention relates to resistance spot welding methods, and more particularly to methods capable of forming a proper nugget using adaptive control welding. Background technique [0002] Generally, a resistance spot welding method, which is a type of overlap resistance welding method, is used to join overlapping steel plates. This welding method is a method in which two or more superimposed steel plates are sandwiched by a pair of electrodes from top to bottom, pressurized, and a high welding current is passed between the upper and lower electrodes for a short time to join them. A dot-shaped welded part can be obtained by utilizing resistance heating generated by passing a high welding current. This point-shaped welded portion is called a nugget, and when current flows to the superimposed steel sheets, both steel sheets are melted at the contact portion of the steel sheets to form a solidified portion, whereby the steel sheets are joined to e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/24B23K11/11
CPCB23K11/115B23K11/241B23K35/02B23K35/0205B23K31/12B23K2101/18B23K2103/04B23K11/24
Inventor 泽西央海冲田泰明池田伦正
Owner JFE STEEL CORP