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Resistance spot welding method

A technology of resistance spot welding and current value, applied in resistance welding equipment, welding equipment, welding/welding/cutting objects, etc., can solve the problems of reduced toughness and reduction, and achieve favorable thin-walled and reliable cross tensile strength. Effect

Active Publication Date: 2020-04-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with regard to the cross tensile strength, even if the tensile strength of the base steel sheet increases, it hardly increases and tends to decrease.
[0005] The reason for this is considered to be a decrease in toughness due to solidification of the nugget or solidification segregation of P and S

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] A combination of two or three stacked steel sheets shown in Table 2 using steel sheets with the composition shown in Table 1 was resistance spot welded under the conditions shown in Table 2 to form welded joints.

[0102] It should be noted that components other than those shown in Table 1 are Fe and unavoidable impurities.

[0103] In addition, the welding machine uses an inverter DC resistance spot welder, and the electrode uses a DR-type chrome-copper electrode with a tip diameter of 6mm.

[0104] Each of the obtained welded joints was subjected to a cross tensile test according to JIS Z 3137 (1999), and evaluated according to the following criteria.

[0105] ◎: When the fracture form is a plug-type fracture, and the diameter of the plug is 110% or more of the diameter of the formed nugget

[0106] ○: The fracture form is a plug-type fracture, and the plug diameter is 100% or more and less than 110% of the formed nugget diameter

[0107] ×: Cases other than the abo...

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Abstract

According to the present invention, while conducting current energization and post-energization, an energization pause time of 0.01 s or more is provided between the current energization and the post-energization, and an Ip / I, which is a ratio of an electric current value of the post-energization to an electric current value of the current energization, is controlled to satisfy a predetermined relationship according to a constant A in relation to the constant A that is defined by an energization time Tp of the post-energization, an energization pause time T, and a Mn content and a P content ina steel sheet to be welded.

Description

technical field [0001] The present invention relates to resistance spot welding methods. Background technique [0002] Such as figure 1 As shown, resistance spot welding is a plate combination (material to be welded) 3 that overlaps two or more steel plates (here, a combination of two steel plates 1 below and 2 above), using a pair of upper and lower electrodes (the lower electrode 4 and the upper electrode 5) are sandwiched, pressurized and energized to melt the contact part, form a nugget 6 of required size, and obtain a welded joint. It should be noted that, in the figure, t is the thickness of the plate assembly 3 . [0003] The quality of the welded joint obtained in this way is determined by the size of the nugget diameter, the depth of penetration or the shear tensile strength (the strength when the tensile test is carried out along the shear direction of the joint), the cross tensile strength (the strength when the tensile test is carried out along the peeling dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/16C22C38/00C22C38/04C22C38/14
CPCB23K11/16C22C38/00C22C38/04C22C38/14B23K11/115B23K2103/04B23K2103/15
Inventor 谷口公一远藤玲子高岛克利松田广志池田伦正
Owner JFE STEEL CORP