Rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding

An electron beam welding, rapid cooling and solidification technology, applied in the direction of electron beam welding equipment, welding/welding/cutting items, auxiliary devices, etc., can solve problems such as coarse grains, reduce violent evaporation, reduce spatter, increase The effect of contact area

Inactive Publication Date: 2020-05-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of coarse crystal grains in the joints of existing thin-plate NiTi alloy electron beam welding, the present

Method used

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  • Rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding
  • Rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding
  • Rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine Figure 1 to Figure 3 This embodiment is described. This embodiment is a thin-plate NiTi alloy electron beam welding rapid cooling and solidification fine-grain device, which includes a clamping body, a cooling copper 12 and a cooling copper fastening mechanism. The cooling copper 12 is arranged on the cooling copper fastening mechanism. Immediately above the snap grip body.

[0028] The welding object to be welded by the device 10 is a thin plate weldment, its length l can range from 85mm to 105mm, its width w can range from 125mm to 145mm, and its thickness h can range from 2mm to 5mm; the length, width and height of the device The ranges are L (300mm ~ 400mm), W (218mm ~ 225mm), H (80mm ~ 90mm).

specific Embodiment approach 2

[0029] Specific implementation mode two: combination figure 1 Describe this embodiment. This embodiment is a press-and-grab type clamp that specifically includes a clamp body 3, two support baffles 5 and four pressure grips 7. The middle parts of the upper end of the clamp body 3, the front, the rear, and both sides are respectively fixed with a support baffle. Plate 5, each supporting baffle plate 5 is provided with a pressure catch 7 on the outer side of both ends respectively, and the root of the pressure catch 7 is fixed on the upper end surface of the fixture main body 3 through fastening bolts 8 . The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0030] In this embodiment, when assembling the base metal 10 to be welded, the press-and-grab clamp body puts the base metal 10 close to the support baffle 5 on one side, and keeps a distance of 9 to 10 mm from the support baffle 5 on the other side. .

[0031] In this embod...

specific Embodiment approach 3

[0032] Specific implementation mode three: combination figure 1 This embodiment will be described. In this embodiment, the middle part of the upper end surface of the clamp main body 3 is provided with a protective groove 4 along the length direction. The undisclosed technical features in this embodiment are the same as those in the second embodiment.

[0033] The size of the protective groove 4 in this embodiment is 5mm×3mm×200mm. The protection groove 4 can prevent the electron beam from penetrating the sample and acting on the fixture, so as to protect the fixture main body 3 .

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Abstract

The invention discloses a rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding and relates to the technical field of welding. The rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding aim to solve the problem that after existing thin plate NiTi alloy electron beam welding, crystalline grains in a connector are coarse. The rapid cooling solidification fine crystal device comprises a pressing and grasping type fixture body, cooled red copper and a cooled red copper fastening mechanism; and the cooled red copper is arranged over the pressing and grasping type fixture body through the cooled red copper fastening mechanism. The welding method includes the steps of performing pretreatment on to-be-welded base metal, clamping the to-be-welded base metal, clamping the cooled red copper fastening mechanism, performing welding and performing cooling. The rapid cooling solidification fine crystal device and welding method for thin plate NiTi alloy electron beam welding are used for thin plate NiTi alloy electron beam welding.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a thin-plate NiTi alloy electron beam welding rapid cooling and solidification fine-grain device and a welding method thereof. Background technique [0002] Welding is the most common processing method for joining two or more metal parts into a component, and the resulting component is usually very strong in all directions. However, for different welding materials, weldments often produce different types of welding defects after welding. For NiTi shape memory materials, the defect that often exists in the welding process is the coarse grain after welding. Due to the low thermal conductivity of NiTi shape memory alloys, under the action of high-energy electron beams, they cannot be effectively conducted away to cause heat accumulation. Liquid metals nucleate and grow at higher temperatures, so post-weld crystals The phenomenon of coarse grains, coarse grains will lead to a decr...

Claims

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Application Information

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IPC IPC(8): B23K15/00B23K15/06B23K37/04
CPCB23K15/0026B23K15/0033B23K15/0093B23K15/06B23K37/0408B23K2103/08B23K2103/14
Inventor 陈国庆柳峻鹏树西尹乾兴张戈张秉刚
Owner HARBIN INST OF TECH
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