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

Resistance spot welding method

A technology of resistance spot welding and current value, which is applied in the direction of resistance welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of reduction and toughness reduction, and achieve favorable and reliable cross tensile strength of thin wall Effect

Active Publication Date: 2021-09-28
JFE STEEL CORP
View PDF8 Cites 0 Cited by
  • 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

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

[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 welding machine, and the electrode uses a DR-type chromium-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 t...

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

No PUM Login to View More

Abstract

A kind of resistance spot welding method, carries out main energization and back energization, and, between main energization and back energization, the energization rest time of more than 0.01s is set, and, in the energization time Tp of post energization, energization rest time T and by belonging to In the relationship of the constant A defined by the amount of Mn and the amount of P in the steel plate to be welded, the ratio Ip / I of the current value of the post-energization to the current value of the main current is controlled so that the predetermined relationship based on the constant A is satisfied.

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

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): B23K11/11B23K11/16C22C38/00C22C38/04C22C38/14
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