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Spot-welding welding method and spot-welding joint

A technology of spot welding and welding joints, which is applied in the welding field of high-strength steel plates, can solve the problems that the spot welding joints are prone to breakage and the spot welding joints are difficult to reach the strength level, so as to improve the cross tensile strength, reduce stress concentration, Effects that are easy to test

Active Publication Date: 2020-08-18
GEELY AUTOMOBILE INST NINGBO CO LTD +1
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Problems solved by technology

[0003] At present, when resistance spot welding is performed on high-strength steel plates, the strength of the spot-welded joint is difficult to reach the strength level corresponding to the base metal, and, in the cross tensile strength test, as the strength of the base metal increases, the nugget of the spot-welded joint more prone to breakage

Method used

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  • Spot-welding welding method and spot-welding joint
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  • Spot-welding welding method and spot-welding joint

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] see figure 1 , The invention provides a spot welding welding method. First, the plate group 3 is placed between the first electrode 4 and the second electrode 5, the plate group 3 includes at least two stacked steel plates, and at least one of the two adjacent steel plates is a high-strength steel plate. Then, the first electrode 4 and the second electrode 5 are respectively pushed to opposite sides of the plate set 3 until they respectively abut against the opposite two sides of the plate set 3 . Next, an external force is applied to the first electrode 4 and / or the second electrode 5, so that the first electrode 4 and the second electrode 5 move closer to each o...

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Abstract

The invention provides a spot-welding welding method. A plate group is placed between a first electrode and a second electrode, during spot-welding welding process, the first electrode and the secondelectrode clamp the plate group and apply pressure to the plate group, meanwhile, the first electrode and the second electrode are energized according to a preset electric current value, a first energization step, an energization suspension step and a second energization step are sequentially performed, after the spot-welding welding process is completed, the first electrode and the second electrode can be loosened, and the plate group that is subjected to the spot-welding connection can be taken out. The invention further provides a spot-welding joint prepared by the spot-welding welding method.

Description

technical field [0001] The invention relates to the technical field of welding of high-strength steel plates used in automobiles, in particular to a spot welding method and a spot welding joint. Background technique [0002] With the goal of reducing the weight of automobiles, high-strength steel plates with a strength of more than 340MPa are widely used. On the other hand, in order to ensure the safety of occupants in the event of a collision, the application of high-strength steel plates has also been expanded to key parts of automobiles, especially ultra-high-strength steels above 1 GPa have become a current research hotspot. [0003] At present, when resistance spot welding is performed on high-strength steel plates, the strength of the spot-welded joint is difficult to reach the strength level corresponding to the base metal, and, in the cross tensile strength test, as the strength of the base metal increases, the nugget of the spot-welded joint The region is more pron...

Claims

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Application Information

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IPC IPC(8): B23K11/11B23K11/36
CPCB23K11/115B23K11/36
Inventor 渡辺吾朗罗时清丁华冯波张杰黄露
Owner GEELY AUTOMOBILE INST NINGBO CO LTD
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