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Assistant coating TIG fusing-brazing method suitable for aluminum/steel dissimilar alloy butting

A brazing method, aluminum alloy technology, applied in the direction of welding/welding/cutting items, welding equipment, metal processing equipment, etc., to achieve the effect of good forming, strong adhesion, and stable welding process

Inactive Publication Date: 2010-06-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Invention patent (application number 200810209813.6) has developed "a kind of flux suitable for arc melting-brazing of aluminum alloy and stainless steel dissimilar metals". This flux can significantly promote the liquid solder on the steel surface under the condition of dynamic arc heating The wetting and spreading of the flux improves the shape of the weld surface, however, the flux itself is only a prerequisite for obtaining a good aluminum / steel arc fusion-brazing joint

Method used

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  • Assistant coating TIG fusing-brazing method suitable for aluminum/steel dissimilar alloy butting
  • Assistant coating TIG fusing-brazing method suitable for aluminum/steel dissimilar alloy butting

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Combining figure 1 , a kind of auxiliary coating TIG fusion-brazing method applicable to aluminum / steel dissimilar alloy butt joint of the present invention, method step is as follows:

[0021] Step 1: Asymmetric V-shaped grooves are made on the butt joint between aluminum and steel plates, the steel side groove angle is 20-50°, and the aluminum side groove angle is 0-30°;

[0022] Step 2: Mechanically grind the groove and the upper and lower surfaces of the aluminum and steel parts to remove the oxide film, and wipe with acetone to remove the surface oil, and then apply an auxiliary layer on the groove of the steel part and the upper and lower surfaces within the range of 5-20mm, auxiliary coating The thickness is 0.1~0.5mm;

[0023] Step 3: Fix the workpiece on the copper-steel composite backing plate, the backing plate is separated from the middle line, half of which is copper and half is steel, fix the steel parts on the copper backing plate, and fix the...

Embodiment 2

[0031]Example 2: 5A06 aluminum alloy and SUS321 stainless steel plate 3.0mm thick butt joint test piece, its auxiliary coating TIG fusion-brazing method is completed by the following steps: (1) The bevel angle of the stainless steel plate is 45 °, and the aluminum alloy plate The groove angle is 30°; (2) Mechanically grind the groove and the upper and lower surfaces of the aluminum alloy and stainless steel parts to remove the oxide film, and wipe with acetone to remove the surface oil, and then coat the auxiliary layer on the groove and the upper and lower surfaces of the stainless steel parts near 15mm , the thickness of the auxiliary coating is 0.3mm; (3) Fix the stainless steel parts on the copper backing plate, fix the aluminum alloy parts on the steel backing plate, and open a forming groove with a width of 8mm and a thickness of 0.5 mm in the middle of the backing plate ;(4) The butt gap of the joint is 2.0mm, the arc length is 4.0mm, and the arc heating position is 1mm ...

Embodiment 3

[0032] Example 3: In steps (1), (4) and (6) of this embodiment, the aluminum plate is pure aluminum or 6A02 aluminum alloy, the steel plate is low carbon steel, the plate thickness is 2.0mm, and the bevel angle of the steel plate is 40° , the groove angle of the aluminum alloy plate is 20°; the butt gap of the joint is 1.5mm, the arc length is 3.0mm, and the arc heating position is 0.5mm away from the steel side; aluminum-silicon welding wire is selected, and the diameter of the welding wire is 1.2mm.

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Abstract

The present invention provides an assistant coating TIG fusing-brazing method suitable for aluminum / steel dissimilar alloy butting. In the assistant coating TIG fusing-brazing method, a TIG electric arc is used as a heat source, and an assistant coating and joint groove design and a welding technology are used. In a welding process, electric arc heat firstly enables an assistant coating to fuse to form a liquid film at a steel groove surface; the TIG electric arc is covered on welding wires to directly heat the welding wires and a fused bath, while not to directly heat steel plates, so a fused phenomenon is avoided to be generated on steel surfaces; the welding wires are fused rapidly to moisten and spread rapidly on the steel groove surface under the function of the assistant coating; the welding wires are fed continuously to be fused to fill welding seams gradually; and meanwhile the electric arc walks rapidly, and brazing alloy spreading is stopped when the heat source is moved away. The welding process is stable, and butting joints of aluminum / steel dissimilar alloy TIG fusing-brazing with good formation are obtained.

Description

(1) Technical field [0001] The invention relates to welding technology, in particular to an auxiliary coating TIG melting-brazing method suitable for butt jointing of aluminum / steel dissimilar alloys. (2) Background technology [0002] At present, the first task of the latest technical equipment working under special conditions is to obtain high-quality welded joints of aluminum / steel dissimilar alloys. Intermetallic compounds seriously deteriorate the mechanical properties of joints and have always been a difficult problem in the field of welding. Although the high-quality connection of aluminum / steel dissimilar alloys can be achieved by using solid-phase joining methods such as hot-press welding, friction welding, and diffusion welding, these welding methods are complicated in equipment, high in cost, and have strict restrictions on the size of the workpiece and the welding place, making them It is difficult to be widely used in actual production. [0003] Recently, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K103/18
Inventor 林三宝宋建岭杨春利张东卫顾文军
Owner HARBIN INST OF TECH
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