Preheating method before welding of thick-wall aluminum alloy

A technology of aluminum alloy and aluminum alloy tube, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of large flame preheating temperature range, low production efficiency, long preheating time, etc. Product quality, improving production efficiency, and the effect of uniform heating area

Inactive Publication Date: 2013-03-13
BEIJING CED RAILWAY ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the aluminum alloy material itself has the characteristics of good thermal conductivity and fast heat dissipation, the preheating time is longer; and the heat of small parts is not easy to transfer and dissipate, and the temperature rises quickly, while the heat of large parts can be transferred and dissipated quickly, and the temperature rises relatively slowly. It is difficult for the temperature of the two to reach a balance at the same time: when the small part reaches the specified preheating temperature, the temperature of the large part is relatively low. During the preheating temperature, the temperature of the small parts exceeds the specified temperature. If welding at this time, the small parts are prone to welding thermal cracks due to the high temperature; and because the thermal stress of the two parts is unbalanced, the expansion coefficient of the aluminum alloy is large, and the weld seam When solidified, the shrinkage is large, resulting in a large tensile stress, so that liquefaction cracks are easy to occur in the near-slit area
[0004] Therefore, the conventional preheating method is very prone to welding defects, resulting in poor quality and unsafe welded structural parts; and due to the long preheating time, the production efficiency is low; at the same time, the flame preheating temperature range is large and the preheating temperature range is difficult to control

Method used

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  • Preheating method before welding of thick-wall aluminum alloy

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specific Embodiment approach

[0013] The preheating method before thick-walled aluminum alloy welding of the present invention, its preferred embodiment is:

[0014] Weld small-sized plates on large-sized aluminum alloy pipes, conduct induction heating from the inside of the aluminum alloy pipes before welding, and heat the plates through heat conduction, so that the aluminum alloy pipes and plates Achieve consistent temperature and balanced preheating in a short time.

[0015] An induction coil consistent with the length of the aluminum alloy pipe is used to extend into the interior of the aluminum alloy pipe for heating.

[0016] The whole of the aluminum alloy pipe is heated.

[0017] The equipment used for heating is an induction heating equipment.

[0018] The method for preheating the thick-walled aluminum alloy before welding can improve product quality, increase production efficiency, and ensure the safety of welding structures.

specific Embodiment

[0019] Such as figure 1 , figure 2 As shown, the support seat 1 and the support seat 3 need to be welded on the tube shaft 2, see the table and figure below:

[0020]

[0021] Induction heating equipment is used for preheating before welding;

[0022] The outer diameter of the produced induction coil is 48mm and the length is 500mm;

[0023] Insert the induction coil into the inner diameter of the pipe shaft, that is, mainly heat the pipe as a whole from the inner wall of the pipe: the two ends of the induction coil are flush with the two ends of the pipe shaft, so that the preheating area becomes larger, and the temperature of the support seat and the positioning plate is guaranteed to be consistent with the heat transfer. The temperature of the tube axis is basically the same, avoiding welding defects such as incomplete penetration and thermal cracks caused by the heat imbalance of parts of the two sizes, and reducing the large tensile stress caused by thermal stress i...

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Abstract

The invention discloses a preheating method before the welding of thick-wall aluminum alloy. A small-specification plate piece is welded on a big-specification aluminum alloy pipe fitting, induction heating is carried out in the aluminum alloy pipe fitting before welding; the plate piece is heated by heat conduction; and therefore the aluminum alloy pipe fitting and the plate piece have the consistent temperature and balanced preheating. The product quality can be improved, the production efficiency is improved, and the welding structure is guaranteed to be safe.

Description

technical field [0001] The invention relates to a welding technology of thick-walled aluminum alloy parts, in particular to a preheating method before welding of thick-walled aluminum alloys. Background technique [0002] When welding thick-walled aluminum alloy products, a preheating process is required before welding. When parts with larger specifications are welded together with parts with smaller specifications for preheating, oxygen-acetylene flame heating is usually used at present. The heating area near the weld. [0003] Because the aluminum alloy material itself has the characteristics of good thermal conductivity and fast heat dissipation, the preheating time is longer; and the heat of small parts is not easy to transfer and dissipate, and the temperature rises quickly, while the heat of large parts can be transferred and dissipated quickly, and the temperature rises relatively slowly. It is difficult for the temperature of the two to reach a balance at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00B23K103/10
Inventor 翟立飒马君苏安社苏孝明
Owner BEIJING CED RAILWAY ELECTRIC TECH
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