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A welding method of variable wall thickness aluminum material

A welding method and a technology of variable wall thickness, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve problems such as welding defects, reduce the occurrence of welding pores and micro cracks, and meet the weld penetration depth, The effect of ensuring welding quality

Active Publication Date: 2019-05-17
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the welding requirements of variable-wall-thickness hexagonal tubes and special-shaped joints, the present invention establishes a welding method for LT24 aluminum alloy variable-wall-thickness hexagonal tubes and special-shaped joints, which solves the problem that welding defects are prone to occur during the welding process and ensures welding quality

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  • A welding method of variable wall thickness aluminum material
  • A welding method of variable wall thickness aluminum material
  • A welding method of variable wall thickness aluminum material

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Depend on figure 1 with figure 2 As shown, the hexagonal tube has an outer square inner circle structure, where the wall thickness is the largest at the sharp corners, with a maximum thickness of 6.4mm; the wall thickness is the smallest at the middle of the plane, with a minimum thickness of 1mm.

[0031] The hexagonal tube and the joint are made of LT24 aluminum alloy, the hexagonal tube and the joint are connected by welding, the depth of the welded joint changes cyclically, the depth of the thinnest part of the joint is 1mm, and the maximum is 6.4mm, and the welding plane transition is not a circular arc transition , but a direct transition at an angle of 120°, this structure brings great difficulties to the welding process.

[0032] Using a variable-wall-thickness aluminum material welding method according to the present invention to connect the aluminum weldment hexagonal pipe with the joint by welding, it includes the following steps:

[0033] (a) Beveling the...

Embodiment 2

[0040] Depend on figure 1 with figure 2 As shown, the hexagonal tube has an outer square inner circle structure, where the wall thickness is the largest at the sharp corners, with a maximum thickness of 6 mm; the wall thickness is the smallest at the middle of the plane, with a minimum thickness of 0.6 mm.

[0041] The hexagonal tube and the joint are made of 6061 aluminum alloy, and the hexagonal tube and the joint are connected by welding. The transition of the welding plane is not a circular arc transition, but a direct transition at an angle of 120°.

[0042] Using a variable-wall-thickness aluminum material welding method according to the present invention to connect the aluminum weldment hexagonal pipe with the joint by welding, it includes the following steps:

[0043] (a) Beveling the hexagonal tube of the aluminum weldment, that is, performing mechanical beveling on the six edges of the hexagonal tube, such as Image 6 As shown, the groove size is 30°×2mm.

[0044...

Embodiment 3

[0050] Depend on figure 1 with figure 2 As shown, the hexagonal tube has an outer square inner circle structure, where the wall thickness is the largest at the sharp corners, with a maximum thickness of 7mm; the wall thickness is the smallest at the middle of the plane, with a minimum thickness of 1.5mm.

[0051] The hexagonal tube and the joint are made of LT24 aluminum alloy, and the hexagonal tube and the joint are connected by welding, which includes the following steps:

[0052] (a) Beveling the hexagonal tube of the aluminum weldment, that is, performing mechanical beveling on the six edges of the hexagonal tube, such as Image 6 As shown, the groove size is 40°×4mm.

[0053] (b) Surface treatment of the hexagonal tube, 5 minutes of alkali washing and 10 minutes of pickling to clean the oil stain and oxide film on the surface of the weldment; then dry the hexagonal tube after surface treatment; the drying device uses far infrared rays Heated blast circulation drying bo...

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Abstract

The invention provides a welding method for a tapered aluminum product. The welding method includes the steps that (a), an aluminum weldment hexagon pipe is chamfered, and the six edges of the hexagon pipe are mechanically chamfered; (b), surface treatment is carried out on the hexagon pipe, and then the hexagon pipe is dried; (c), the hexagon pipe is assembled with a connector to be welded and a welding fixture, after being assembled, the hexagon pipe, the connector and the welding fixture are wholly preheated, and welding arc is used for local preheating before welding; (d), welding is carried out, aluminum silicon welding wires are adopted, according to the welding process parameters, the welding current is 120-160 A, and the flow rate of the protective gas argon is 5-15 L / min. By reasonably selecting and matching groove size design, welding wire selection, a clearing method before welding and parameters such as preheating temperature and argon flow, welding pores and micro cracks are reduced, weld penetration meets the requirement, weld joints meet the I level weld joint standard, and therefore argon arc welding of the tapered aluminum hexagon pipe and the special-shaped connector is achieved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing nuclear fuel elements of research and test reactors, and in particular relates to a welding technology of variable-wall-thickness aluminum alloy pipes and special-shaped joints. Background technique [0002] The existing aluminum alloy welding technology is mainly aimed at the welding of alloy plates and pipes with equal wall thickness, but there is no relevant report on the welding technology for aluminum alloy pipes with variable wall thickness. The chemical activity of LT24 aluminum alloy is very strong, and it is easy to form an insoluble oxide film on the surface (Al 2 o 3 The melting point is 2050°C, and the melting point of MgO is 2500°C), in addition, this series of aluminum alloys has strong thermal conductivity, and it is easy to cause non-fusion during welding. Since the density of the oxide film is similar to that of aluminum, it is also easy to become an inclusion in the weld ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/028B23K37/00B23K101/06B23K103/10
CPCB23K9/0282B23K9/16B23K37/00B23K2101/06B23K2103/10
Inventor 刘长城魏东波孙刚峰刘斌邢文军张洲峰
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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