Resistance spot welding method
A technology of resistance spot welding and current value, applied in the direction of resistance welding equipment, welding power supply, welding equipment, etc., can solve the problems of reduced toughness and low cross tensile strength, so as to improve the cross tensile strength and suppress the occurrence of spatter , the effect of full cross tensile strength
Active Publication Date: 2021-03-09
JFE STEEL CORP
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Problems solved by technology
[0006] In addition, regarding the nugget of a welded joint obtained by welding a plate group including a high-strength steel plate, the following problems have been pointed out: Even if a predetermined nugget diameter is ensured, it is brittlely fractured against a load in the peeling direction, and the cross-tensioned lower intensity
This is because the nugget of the high-strength steel plate is hardened after quenching, and the toughness is reduced.
Method used
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Embodiment
[0102] As an embodiment of the present invention, as mentioned above figure 1 As shown, resistance spot welding is performed on a plate group 3 obtained by superimposing two steel plates (the lower steel plate 1 and the upper steel plate 2 ) to produce a resistance spot welded joint. The device used for resistance spot welding is a C-gun type welding device that uses a servo motor to pressurize the electrode. It should be noted that the power supply is a DC power supply.
[0103] The energization at this time was performed under the conditions shown in Table 1.
[0104] In addition, as the electrodes 4 and 5 , a DR type electrode of aluminum oxide dispersed copper having a curvature radius R40 at the tip and a tip diameter of 8 mm was used.
[0105] Table 1 shows the results of investigation of the nugget diameters after welding (indicated as "diameter" in the table). The diameter of the nugget was evaluated by the etched structure of a cut section (a section cut perpendicu...
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Abstract
The present invention provides a resistance spot welding method capable of stably forming a nugget with a large diameter and ensuring sufficient cross tensile strength even when welding is performed by continuous spot welding at hundreds of points. The present invention is a method for performing resistance spot welding on a plate group obtained by superimposing steel plates. Main energization, preliminary energization before main energization, and post-energization after main energization are performed. For the energization time, when the current value of the main energization is set to Im[kA], the energization time is set to Tm[ms], the current value of the preliminary energization is set to Ip[kA], and the energization time is set to Tp[ms], Set the non-energization time between the preliminary energization and the main energization as Tcp [ms], set the current value of the post-energization as Ir [kA], set the energization time as Tr [ms], and set the time between the main energization and the post-energization When the non-energized time is set to Tcr [ms], control each one within the specified range.
Description
technical field [0001] The present invention relates to a resistance spot welding method which is a kind of lap resistance welding method, and particularly relates to a technique for realizing formation of a large-diameter nugget (melt zone) without spattering or the like. Background technique [0002] In recent years, in order to simultaneously improve the reliability of the vehicle body and reduce the weight of the vehicle body to reduce air pollutants, high-strength steel sheets have been promoted. By adopting a high-strength steel plate, compared with conventional steel, it is possible to achieve the same level of body rigidity even with thinner walls and lighter weight. However, a number of issues were also pointed out. One of the above-mentioned problems is that the quality of welded parts in the vehicle body assembly process decreases as the strength increases. [0003] Resistance spot welding is a technique such as: figure 1 As shown, a pair of upper and lower ele...
Claims
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IPC IPC(8): B23K11/24B23K11/11B23K11/16
CPCB23K11/11B23K11/16B23K11/24B23K11/115B23K11/241B23K2101/006
Inventor 谷口公一冲田泰明池田伦正
Owner JFE STEEL CORP