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Electric resistance welding method for variable-thickness ultra-high strength hot formed steel plate and low-carbon steel plate

A low-carbon steel plate, resistance welding technology, applied in resistance welding equipment, welding equipment, metal processing equipment, etc., can solve the problem of the softening phenomenon of the heat-affected zone cannot be improved, and achieve the improvement of influence, heat distribution, and uniformity. Effect

Inactive Publication Date: 2012-07-18
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the former only studied the welding of the same material of ultra-high-strength hot-formed steel plates, and the softening phenomenon in the heat-affected zone could not be improved; the latter only studied the spot welding of ultra-high-strength steel plates and low-carbon steel plates of equal thickness, and single-pulse welding
After inquiry, there is no research and application of resistance spot welding method and process welding unequal thickness ultra-high-strength hot-formed steel plate and low-carbon steel plate using preheating plus welding double pulse, and the upper and lower electrode end surface areas are different.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The low-carbon steel plate support with a thickness of 0.8mm is welded to the car B-pillar inner plate reinforcement plate (thickness is an ultra-high-strength hot-formed steel plate of 2.0mm) with the resistance spot welding method and technology of the present invention, and its implementation process is as follows:

[0018] 1. Place the low-carbon steel plate bracket with a thickness of 0.8mm on the reinforcement plate of the inner panel of the B-pillar of the car according to the positioning requirements. The lower surface of the bracket fits well with the reinforcement plate.

[0019] 2. Place the part of the lower surface of the reinforcing plate that needs to be spot welded on the lower electrode of the DN2-63 industrial frequency integrated suspension spot welding machine (the spherical electrode whose end surface is a Φ10mm plane).

[0020] 3. Start the welding machine, lower the spherical upper electrode whose end face is a Φ5mm plane, and compact the joint par...

Embodiment 2

[0027] The low-carbon steel nut plate with a thickness of 1.5mm is welded to the car B-pillar inner panel reinforcing plate (a super-high-strength hot-formed steel plate with a thickness of 2.0mm) by the resistance spot welding method and process of the present invention.

[0028] The equipment resistance welding machine used is N2-63 industrial frequency integrated suspension spot welding machine, equipped with a microcomputer controller, its rated power is 63kVA, the secondary open circuit voltage is 8V, the maximum secondary short circuit current is 18kA, and the electrode is the largest The pressure is 7kN. The resistance welding machine includes a spherical upper electrode and a spherical lower electrode, the end surface area of ​​the spherical upper electrode is Φ6mm, and the end surface area of ​​the spherical lower electrode is Φ8mm.

[0029] Place the low-carbon steel nut plate on the top of the B-pillar inner panel reinforcement plate of the car, then place the B-pil...

Embodiment 3

[0032] The welding current is 7.5KA, the welding time is 20 cycles, and the rest are the same as in Embodiment 1.

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Abstract

The invention relates to an electric resistance welding method for a variable-thickness ultra-high strength hot formed steel plate and a low-carbon steel plate. The method is characterized in that the low-carbon steel plate and the ultra-high strength hot formed steel plate are lapped on electric resistance welding machines with different upper and lower electrode end face areas, and are welded by means of preheating and double pulsing. Compared with the prior art, the method has the advantages that the defect of the influence of splash, nugget deviation and the like on welding spot quality in spot welding of variable-thickness dissimilar steel can be avoided, the influence of softening of a heat-affected zone of the ultra-high strength hot formed steel plate on joint quality is decreased, welding quality of electric resistance spot-welded joints of the variable-thickness ultra-high strength hot formed steel plate and the low-carbon steel plate is remarkably improved, and the like.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a resistance welding method for welding dissimilar steel materials of unequal thickness, one of which is an ultra-high-strength hot-formed steel plate. Background technique [0002] "Energy saving, environmental protection, and safety" are the three major themes of automobile development in the 21st century. The hot forming technology of ultra-high strength steel is the latest technology to realize the weight reduction of automobile body and improve the safety of collision. At present, countries such as Europe, the United States, and Japan Large automobile manufacturers have successfully applied ultra-high-strength hot-formed steel plates to the production of security parts such as door anti-collision beams, front and rear bumpers, and car body structural parts such as A-pillars, B-pillars, C-pillars, and middle tunnels. It can realize the lightweight of the car, and also signif...

Claims

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Application Information

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IPC IPC(8): B23K11/11B23K11/34
Inventor 王敏程轩挺孔谅孙游吴嘉元
Owner SHANGHAI JIAO TONG UNIV
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