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Steel and aluminum welding method

A welding method and pre-welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as uneven weld composition, reduced weld plasticity and toughness, and weld joints are prone to cracks, and achieve joint performance. good effect

Inactive Publication Date: 2016-10-05
重庆沁煌实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of aluminum alloy solves a very important problem. The welding of aluminum alloy itself is difficult. The welding between dissimilar metals is usually more difficult than the welding of the same metal. The weldability of steel and aluminum or aluminum alloy is poor, so when welding There are: the welded joint is easy to oxidize, the weld composition is uneven, the welding deformation is large, and the welded joint is prone to cracks. During the welding process of steel and aluminum or aluminum alloy, various intermetallic compounds will be produced, which increases the welding The brittleness of the seam reduces the plasticity and toughness of the weld. When the general fusion welding method is used, the above factors make the connection between the two difficult. If other welding methods are used, such as pressure welding and brazing, the joint Shape is limited and efficiency is greatly reduced

Method used

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Embodiment Construction

[0014] Below in conjunction with embodiment the present invention will be further described, and its operating steps are as follows:

[0015] A welding method for steel and aluminum, the welding method comprising the following steps:

[0016] a. Thoroughly remove burrs, scale, water and oil stains on the tube plate and tube ends before welding;

[0017] b. The modified argon arc welding machine is used, that is, the PQ1~350 type argon arc welding torch is connected to the Ax~320

[0018] On the welding machine, and connect the gas cylinder, flow meter, squatting water, etc.;

[0019] c. Adopt DC reverse connection and short arc operation, the welding torch swings slightly laterally, no need to add filler metal;

[0020] d. Use Φ1.5~3mm tungsten wire as tungsten electrode, tungsten wire extension length: 3~5mm, welding current 150~320A, welding voltage 30~45V, wire feeding speed 1~3.0m / min argon gas flow ;8~13L / min, rush to connect the negative pole;

[0021] e. When striki...

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PUM

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Abstract

The invention discloses a steel and aluminum welding method. The steel and aluminum welding method is characterized by including steps: a, burrs, oxide skin, water, oil stains and the like on tube plates and tube ends are thoroughly cleared before welding; b, a modified argon arc welder is adopted, namely a PQ1-350 argon arc welding gun is connected to an Ax-320 welding machine; c, by direct-current reverse polarity short arc operation, the welding gun is shaken slightly transversely, and addition of filler metal is avoided; d, a tungsten filament (phi 1.5-3mm) is used as a tungsten electrode, a tungsten filament extension length is 3-5mm, welding current is 150-320A, welding voltage is 30-45V, argon flow rate is 8-13L / min, and the welding gun is connected with a cathode; e, arc striking is carried out in a joint, and argon is fed in advance before welding; f, argon is stopped after welding is finished, and welding quality inspection is performed. By the steel and aluminum welding method, melt-brazed joints excellent in weld forming and joint performance can be obtained.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a welding method for steel and aluminum. Background technique [0002] In order to reduce pollution and save energy, the automobile industry replaces the steel structure of the body part by introducing some aluminum alloys. The introduction of aluminum alloy solves a very important problem. The welding of aluminum alloy itself is difficult. The welding between dissimilar metals is usually more difficult than the welding of the same metal. The weldability of steel and aluminum or aluminum alloy is poor, so when welding There are: the welded joint is easy to oxidize, the weld composition is uneven, the welding deformation is large, and the welded joint is prone to cracks. During the welding process of steel and aluminum or aluminum alloy, various intermetallic compounds will be produced, which increases the welding The brittleness of the seam reduces the plasticity and toughness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/23B23K9/235
Inventor 赵伟
Owner 重庆沁煌实业有限公司