Method for increasing size of resistance spot weld nugget on thin-plate side of multilayer plates in different thickness

A technology of resistance spot welding and multi-layer boards, which is applied in resistance welding equipment, welding equipment, metal processing equipment, etc., can solve the problem of undiscovered side nugget size of three-layer board and thin plate, and achieve the goal of increasing the nugget size Effect

Inactive Publication Date: 2012-11-28
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
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Problems solved by technology

However, there is currently no report on the use of structural adhesives to increase the side nugget size of three-layer laminates with different thicknesses

Method used

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  • Method for increasing size of resistance spot weld nugget on thin-plate side of multilayer plates in different thickness
  • Method for increasing size of resistance spot weld nugget on thin-plate side of multilayer plates in different thickness
  • Method for increasing size of resistance spot weld nugget on thin-plate side of multilayer plates in different thickness

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Embodiment Construction

[0029] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0030] The specific parameters of the material selected in this embodiment are as follows:

[0031] Both the upper electrode 1 and the lower electrode 6 are chromium-zirconium copper electrodes, and the diameter of the electrode end face is 5 mm.

[0032] The upper steel plate 2 to be welded is double-sided galvanized low-carbon steel plate (mass percentage C: 0.037, Si: 0.018, Mn: 0.21, P: 0.01, S: 0.02, Al: 0.04, and the balance is Fe), and the thickness of the steel plate is 0.8 mm , double-sided coating thickness is 60g / m 2 。

[0033] The steel plate 4 to be welded in the middle layer is a doubl...

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Abstract

The invention relates to a method for increasing size of a resistance spot weld nugget on a thin-plate side of multilayer plates in different thickness. When the resistance spot welding connection for the multilayer plates in different thickness is performed, an epoxy resin structural glue is applied between upper or lower-layer to-be-welded metal plate and a middle-layer to-be-welded metal plate, wherein the epoxy resin structural glue is a single-component thermo-curing epoxy resin glue and has a density of 1.03-1.20g / mm3, a viscosity coefficient @50 DEG C (Pa.s) of 20-50 and a thickness of 0.2-1.2mm. According to the method provided by the invention, a glue-layer membrane resistor is formed after the structural glue is applied, so that a contact resistance between metal plates is increased and the generation and growth of a spot weld nugget are boosted, and meanwhile, the influence of the structural glue on a path of outward radiating through air on the surface of a steel plate is reduced and the heat required by the generation of the spot weld nugget is increased, so that the size of the resistance spot weld nugget on the thin-plate side is increased and the strength requirement for a spot-welded joint on the thin-plate side of the multilayer plates in different thickness is ensured.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for increasing the nugget size of resistance spot welding of differential thick plates by applying epoxy resin structural glue on the thin plate side of differential thick plates. Background technique [0002] In response to the technical requirements for energy saving, emission reduction and body weight reduction of automobiles, materials such as advanced high-strength steel, aluminum alloy and magnesium alloy are more and more used in the body. Three-layer boards with different strengths and thicknesses will be matched in parts, and the proportion of applications is increasing year by year. Ensuring the quality of the connection joints of three-layer boards with different strengths and thicknesses is an important problem that needs to be solved in car body manufacturing. Due to its low cost and high efficiency, resistance spot welding is currently the main process met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/34B23K11/20
Inventor 张延松王培中来新民沈洁陈关龙
Owner SHANGHAI JIAO TONG UNIV
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