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Composite welding scheme between dissimilar metal materials

A technology of composite welding and dissimilar materials, applied in the field of machinery

Inactive Publication Date: 2009-07-01
NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current common welding scheme cannot meet the above requirements, so it is urgent to invent a new welding scheme to meet the special requirements of composite welding of dissimilar materials between the expander cold finger and the cold cap in the Stirling refrigerator

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with drawings and embodiments.

[0010] Such as figure 2 As shown, the present invention proposes a composite welding scheme for dissimilar materials between the cold finger of the expander and the cold cap of the Stirling refrigerator, and it relates to the cold cap of the expander in the Stirling refrigerator 1, welding transition Ring 2 and cold finger 3, the positional relationship of the three after welding is that the welded transition ring 2 is set on the expander cold cap 1, the welded transition ring 2 is stepped, and the expander cold finger 3 is a thin-walled tube. Set on the welding transition 2 ring. The cold finger 3 of the expander in the Stirling refrigerator is made of stainless steel, and the cold cap 1 is made of oxygen-free copper. Due to their different materials, the weldability of the two is poor. Therefore, the cold cap 1 and the welded transition ring 2 involved in the solut...

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Abstract

The invention relates to a composite welding proposal for different materials, in particular to composite welding for different materials between a cold finger of an expansion machine and a cold cap in a Stirling refrigerator, which belongs to the field of machinery. The welding proposal is realized by combining electron beam welding with laser welding. The oxygen-free copper cold cap is firstly connected with a transitional material into a whole by utilizing an electron beam welding mode, and then the laser welding is utilized to weld the cold cap with a thin-walled tube of the cold finger of the expansion machine after finish processing. The invention solves the difficult problem of welding different materials between the cold cap and the cold finger of the expansion machine and has the advantages of small deformation of welding seams, low structural leak rate and prolonged service life of the refrigerator. Likewise, the welding proposal can be applied to other similar occasions in the industry.

Description

technical field [0001] The invention relates to a welding method, in particular to a compound welding of dissimilar materials between the cold finger of the expander and the cold cap used in the Stirling refrigerator, and belongs to the field of machinery. Background technique [0002] Due to the many advantages of the Stirling refrigerator, it is currently widely used in space and on the ground. The Stirling refrigerator is a very precise machine. In order to transfer heat between the load and the load, the materials of the cold cap and the cold finger are often different materials. , which brings great difficulty to the welding of cold cap and cold finger. The cold finger is a slender, thin-walled part, which has high requirements for machining and welding. It requires small residual stress in machining, and requires high air tightness after welding. Generally, the leakage rate is required to be lower than 1×10 -8 Pa·m 3 ·s -1 , The refrigerator with longer life has hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K15/04B23K26/20B23K103/18B23K26/346
Inventor 许国太闫春杰霍英杰陈正刚王田刚潘雁频
Owner NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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