Vacuum brazing evaluation test piece for vacuum brazing process evaluation
A brazing process and vacuum technology, applied in the field of vacuum brazing evaluation test pieces, can solve the problems such as the test pieces do not meet the requirements of full-size samples, and the brazing gap setting cannot simulate actual production.
Active Publication Date: 2022-07-15
SOUTHWESTERN INST OF PHYSICS
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Problems solved by technology
[0004] In order to solve the technical problems that the test piece used in the existing vacuum brazing process evaluation does not meet the requirements of the full-scale sample and the setting of the brazing gap cannot simulate the actual production, the embodiment of the present invention provides a vacuum brazing process evaluation Vacuum brazing test piece
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Embodiment 1
[0055] Example 1 Brazing process evaluation of 316LN stainless steel & CuCrZr composite pipe lap joint
[0056] refer to image 3 As shown, the key components in the superconducting shielding member 8 are composed of copper alloy & stainless steel composite tube 9 . There are 10k and 5bar helium refrigerant inside the 316L stainless steel tube. The vacuum brazed joint of the composite tube is required to have the following properties: the brazing adhesion rate of the 200mm stainless steel tube and the copper plate vacuum brazed joint reaches more than 95%, and can serve stably at 4K 2) The strength of the brazed joint at room temperature is greater than 200MPa, 4.2K 3) Good sealing performance, the leakage requirement is 1x10-10Pa.m 3 / s.
[0057] Adopt the vacuum brazing evaluation test piece of the embodiment of the present invention to carry out process evaluation:
[0058] refer to Figure 4 As shown, the first workpiece of the vacuum brazing evaluation test piece ado...
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Abstract
In order to solve the technical problems that a test piece used in existing vacuum brazing process evaluation does not meet the requirement of a full-size sample and the arrangement of a brazing gap cannot simulate actual production, the embodiment of the invention provides a vacuum brazing evaluation test piece for vacuum brazing process evaluation, which comprises a second workpiece with a strip-shaped structure; the first channel penetrates through the second workpiece in the length direction of the second workpiece; the first workpiece is provided with a cavity, and the cavity is used for being matched with the long-strip-shaped structure of the second workpiece to form a lap joint brazing seam and a butt joint brazing seam; wherein the lap joint brazing seam is communicated with the butt joint brazing seam; the second channel penetrates through the first workpiece in the length direction of the first workpiece and is used for being communicated with the first channel to form a through hole; and the brazing filler metal feeding groove is formed in the first workpiece and used for filling the lap joint brazing seam and the butt joint brazing seam with brazing filler metal through the brazing filler metal feeding groove. According to the embodiment of the invention, the defects that a test piece used in the existing vacuum brazing process evaluation does not meet the requirement of a full-size sample, and actual production cannot be simulated due to the arrangement of a brazing gap are overcome.
Description
technical field [0001] The invention relates to a vacuum brazing evaluation test piece used for vacuum brazing process evaluation. Background technique [0002] The low temperature superconducting magnet system consists of superconducting coil, cladding, superconducting coil support and cooling system. The cooling system is the key system to maintain the thermal stability of superconducting magnets. The cooling system contains a large number of stainless steel and copper alloy components; the size, structure and joints are complex and varied, and the brazed joints are of high quality. According to the relevant requirements of welding quality management, brazing process evaluation needs to be carried out before mass production to verify the reliability of the brazed joint in service in the liquid helium temperature zone. [0003] However, after searching, it was found that all the test pieces recommended by the existing two standards on brazing, such as EN13134 vacuum brazi...
Claims
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IPC IPC(8): B23K3/08
CPCB23K3/08Y02E40/60
Inventor 张腾陈辉邓华林孙振超魏海鸿李鹏远
Owner SOUTHWESTERN INST OF PHYSICS