Welding wire and method for welding the aluminum and aluminum alloy and steel

A technology of aluminum alloy and welding wire, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems that it is difficult to ensure the joint of dissimilar metals between aluminum and steel, the welding effect is not ideal, and the joint strength is low, so as to inhibit the formation of intermetallic compounds , The welding process is stable and reliable, and the welding cost is low

Inactive Publication Date: 2008-10-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the facts prove that the welding effect of this method is not ideal, the intermediate layer is difficult to avoid the formation of brittle intermetallic compounds, and there are many joint defects, high residual stress and low joint strength
[001

Method used

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  • Welding wire and method for welding the aluminum and aluminum alloy and steel
  • Welding wire and method for welding the aluminum and aluminum alloy and steel
  • Welding wire and method for welding the aluminum and aluminum alloy and steel

Examples

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Effect test

Embodiment 1

[0061] The material is 3.0mm thick aluminum alloy 5A06 and stainless steel 1Cr18Ni9Ti butt joint test piece, the welding machine is CLOOS GLW 300I-H-P-R TIG welding machine, special welding wire and special welding process are used for TIG welding, and the obtained aluminum alloy and stainless steel dissimilar The tensile strength of the material joint reaches 180MPa, which is twice the strength of the arc melting and brazing joint under the coating process, and the joint has no air hole defect.

Embodiment 2

[0063] For 2.0mm thick hot-rolled aluminum alloy 6A02 and carbon steel Q235 thin plate, the butt gap between aluminum and steel is about 1.0; the carbon steel plate has a 30° groove on the side and a 1.0mm blunt edge, and the steel plate is fixed on the copper plate with circulating cooling water. On the jig: K-shaped grooves are opened on both sides of the aluminum alloy side, the groove angle is 50°, single-sided welding and double-sided forming, LORCH V24 TIG welding machine is used, the welding torch is 1.0mm away from the aluminum alloy side, and special welding wire is used for welding . The tensile strength of the joint reaches 110MPa, the joint breaks in the heat-affected zone of aluminum alloy 6A02, and the weld has no air hole defect.

[0064] The invention successfully solves the bottleneck problem of arc melting and brazing aluminum alloy and stainless steel dissimilar materials. Compared with solid-phase joining methods such as vacuum brazing and diffusion welding...

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Abstract

The invention discloses a welding wire and a method for applying the welding wire on aluminum and aluminum alloy to be welded with steel. The welding wire (3) takes Al-Si solder as matrix, and then alloying elements of Cu, Mn, Zn and microelements of B, Zr and La are added to form a dedicated welding wire. The method comprises the following steps: K-shaped divided edges are formed on both ends of the aluminum and aluminum alloy (5); the angle of the divided edges is 50 plus or minus 5DEG C; a divided edge of 30 plus or minus 5 and a truncated edge of 1.0-2.0mm are formed on the side of a steel piece (4); the steel piece (4) is fixed on a chucking tool with a cooling device; the butt clearance between the aluminum and aluminum alloy (5) and the steel piece (4) is 1.0-2.0mm; a small-scaled pulse AC TIG welding method is adopted for single-side welding to realize double side shaping; a tungsten electrode (2) is hemispherical; the nozzle (1) of a welding gun is inclined to the aluminum side; and the welding wire (3) is continuously fed. The method can successfully realize the effective and fine quality connection of the aluminum and the dissimilar steel material by electric arc braze welding without clad layer, and has the advantages of simple operation, low welding cost, and stable and reliable welding process.

Description

technical field [0001] The invention relates to the technical field of welding aluminum, aluminum alloy and steel dissimilar materials. Background technique [0002] Due to their low density, high specific strength, good electrical conductivity, thermal conductivity and corrosion resistance, and good mechanical properties at low temperatures, aluminum and aluminum alloys have been widely used in aerospace, automotive, transportation, national defense and other industrial sectors. Wide range of applications. Steel is the most widely used material and has always played a leading role in the manufacturing industry, especially some new types of steel, such as heat-resistant steel, high-strength steel, etc., which have excellent plasticity, toughness, cold and hot processing performance and corrosion resistance. It is widely used in important welding structures such as petroleum, chemical industry, aerospace and nuclear engineering. In order to make full use of the inherent adv...

Claims

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Application Information

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IPC IPC(8): B23K35/28C22C1/02B23K9/23
Inventor 宋建岭林三宝杨春利范成磊
Owner HARBIN INST OF TECH
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