Horizontally laid large-section aluminum bus welding construction method

A technology of horizontal laying and construction methods, applied in welding equipment, welding accessories, manufacturing tools, etc., can solve problems such as welding deformation, reduce welding deformation and thermal cracks, increase deposition rate, and reduce porosity.

Active Publication Date: 2011-07-20
CHINA CHEM ENG SECOND CONSTR +1
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Problems solved by technology

[0005] In order to solve the welding deformation and thermal cracks that are easy to occur when welding large-section aluminum busbars, a

Method used

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  • Horizontally laid large-section aluminum bus welding construction method
  • Horizontally laid large-section aluminum bus welding construction method
  • Horizontally laid large-section aluminum bus welding construction method

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[0015] The welding construction method for horizontally laying large-section aluminum busbars described in the present invention is to fix a pair of aluminum busbars to be welded and place them in a welding pool crystallization tank with a heater. Semi-automatic melting pole MIG double pulse is used. At the same time of argon arc welding, the aluminum bar 2 is directly inserted into the molten pool as a filler welding material for welding. Before welding starts, both ends of the busbar welding part are preheated. The preheating temperature is 150-250℃. The temperature of the welding part of the aluminum bus bar 1 is in the range of 150-250 °C.

[0016] Since the melting point of aluminum is relatively low at 660.37°C, the excess heat of the molten pool is used to melt and fill the welding material to fill the weld, increase the deposition rate, reduce welding deformation, save welding materials, and improve working conditions. The production efficiency and welding quality can ...

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Abstract

In order to solve the problems of welding deformation and hot cracks in the process of welding large-section aluminum buses and improve welding efficiency, the invention provides a horizontally laid large-section aluminum bus welding construction method. In the method, aluminum buses to be welded are paired and fixed, and arranged in a welding pool crystallization tank with a heater, semi-automatic metal inert-gas (MIG) double pulse argon arc welding is adopted, and an aluminum bar serving as a welding material is directly inserted into the welding pool for welding simultaneously; before welding, two ends of welding positions of the buses are pre-heated at the temperature of between 150 and 250DEG C; and in the welding process, the temperature of the welding positions of the aluminum buses is always kept in a range of 150-250DEG C. Compared with the prior art, the method has the advantages that: the temperature of the welding pool can be reduced and the welding speed can be improved by filling the welding material; and the crystallization tank heats the welding positions in the welding process, so that air holes of welding lines are reduced and the welding deformation and hot cracks are reduced.

Description

technical field [0001] The invention relates to a welding method, specifically a welding construction method for horizontally laying large-section aluminum busbars, which is mainly used in the horizontal welding of large-section aluminum busbars in aluminum or metal magnesium production enterprises and related large-section aluminum busbar horizontal welding construction processes. Background technique [0002] The melting point of pure aluminum is low, only melting point is 660.37°C, boiling point is 2467°C, density is 2.702 g / cm, aluminum has a face-centered cubic structure, and has good electrical and thermal conductivity; pure aluminum is soft. There is no obvious color change when heating and melting, and it is easy to cause collapse and leakage during welding. After aluminum welding, the weld fusion zone and heat-affected zone will soften. Therefore, aluminum welding requires high energy density and welding heat input. High-efficiency welding method with small size and...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/23B23K9/235B23K9/32
Inventor 刘晨晞
Owner CHINA CHEM ENG SECOND CONSTR
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