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Clamping head for fuel rod pressure electric resistance welding

A piezoresistor and fuel rod technology, applied in the field of resistance welding, can solve problems such as the length of the dense zone is difficult to achieve the ideal target, high resistivity, etc., to achieve the effect of increasing the welded dense zone, increasing the dense zone, and improving welding performance

Active Publication Date: 2018-04-13
CNNC JIANZHONG NUCLEAR FUEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 1 What is shown is the case of welding with a conventional copper clamp. The arrow in the figure indicates the current flow direction. Since the current tends to flow through the area with low resistance, and the resistivity of the cladding tube is greater than that of the copper clamp, most of the current Flow directly through a certain area of ​​the end plug to the cladding tube and copper collet without longitudinal flow on the cladding tube, resulting in a small longitudinal length L1 of the weld between the cladding tube and the end plug, while unwelded The length L2 of the area is relatively large, and the length of the dense area of ​​welding is difficult to achieve the ideal target

Method used

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  • Clamping head for fuel rod pressure electric resistance welding
  • Clamping head for fuel rod pressure electric resistance welding
  • Clamping head for fuel rod pressure electric resistance welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as Figure 4-Figure 5 As shown, a fuel rod pressure resistance welding chuck includes a chuck body 3 , and the chuck body 3 includes a chuck front end 31 and a chuck rear end 32 . Several pieces of metal sheets 5 are arranged between the front end 31 of the chuck and the rear end 32 of the chuck, and the front end 31 of the chuck, the metal sheets 5 and the rear end 32 of the chuck are connected by two high-strength plastic screws 6, These high-strength plastic screws 6 are not conductive.

[0026] The contact surfaces of two adjacent metal sheets 5 are provided with an insulating coating, and the contact surfaces of the metal sheets 5 and the chuck body 3 are also provided with an insulating coating, and all the metal sheets 5 Stacking and distribution along the axial direction of the fuel rods. All the metal sheet 5 , the front end 31 of the chuck and the rear end 32 of the chuck are connected by at least one conductor 4 , and the resistance values ​​of the con...

Embodiment 2

[0031] Such as image 3 , Image 6 , Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that the conductor 4 is installed on the outside of the metal sheet 5 , the front end 31 of the collet and the rear end 32 of the collet, which is convenient for installation and disassembly.

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Abstract

The invention discloses a clamping head for fuel rod pressure electric resistance welding. The clamping head comprises a clamping head body. The clamping head body comprises a clamping head front endand a clamping head rear end; a plurality of metal pieces are arranged between the clamping head front end and the clamping head rear end; insulation coatings are arranged on the mutually-contacting surfaces of every two adjacent metal pieces correspondingly, and insulation coatings are also arranged on the surfaces, mutually making contact with the clamping head body, of the metal pieces; all themetal pieces are overlapped and distributed in the axial direction of a fuel rod; and all the metal pieces, the clamping head front end and the clamping head rear end are connected through at least one electric conductor, and electric resistance values of the electric conductors, a cladding pipe and an end plug are matched with one another. Welding currents can be distributed evenly in the longitudinal direction of the fuel rod, the welding dense area is increased obviously, the welding performance of the end plug and the cladding pipe is improved, and the defects that the current flowing area is small and the longitudinal length of a weld seam is small due to the fact that the local electric resistance is small when a copper clamping head is adopted are overcome.

Description

technical field [0001] The invention relates to the technical field of resistance welding, in particular to a fuel rod pressure resistance welding chuck. Background technique [0002] Fuel rod pressure resistance welding is to weld the end plug and the cladding tube as a whole. Under the action of a small extrusion force, the end surface of the cladding tube is brought into contact with the mating surface of the end plug, and the current is applied to the workpiece through the electrode. The resistance of the surface is high, and the resistance heat generated by the contact surface and the adjacent area makes the metal of the welding surface in a plastic state, and then quickly applies an upsetting force to the joint, and the welding of the end plug and the cladding tube is completed by upsetting. [0003] An important technical issue in pressure resistance welding of fuel rods is how to obtain a long enough longitudinal weld. figure 1 What is shown is the case of welding w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/31
CPCB23K11/31
Inventor 张昱方宇栋
Owner CNNC JIANZHONG NUCLEAR FUEL