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Perforated TIG (Tungsten Inert Gas) arc melting brazing method of dissimilar metal

A dissimilar metal, melting and brazing technology, applied in the direction of arc welding equipment, metal processing equipment, welding equipment, etc., can solve the problems of difficulty in spreading liquid metal, uneven structure and performance of brazing interface, etc., achieve low cost and reduce brittleness Phase formation, good process stability

Inactive Publication Date: 2012-08-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a perforated TIG arc melting and brazing method for dissimilar metals, which solves the problems of inhomogeneity of the structure and performance of the brazing interface and difficulty in spreading the liquid metal during welding of dissimilar metals

Method used

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  • Perforated TIG (Tungsten Inert Gas) arc melting brazing method of dissimilar metal
  • Perforated TIG (Tungsten Inert Gas) arc melting brazing method of dissimilar metal
  • Perforated TIG (Tungsten Inert Gas) arc melting brazing method of dissimilar metal

Examples

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Effect test

Embodiment 1

[0025] Example 1: Combining figure 1 , figure 2 , the perforated type TIG arc melting and brazing method of dissimilar metals of the present invention, realizes according to the following steps:

[0026] Step 1: Test workpiece and equipment preparation: 1 set of AC TIG welding machine, 1 set of inching wire feeder, 1 set of automatic walking mechanism, 1 piece of copper backing plate with forming groove, 1 set of rigid fixture, workpiece: workpiece ( 31) It is metal steel or titanium alloy with high melting point, Y-shaped groove is opened, the workpiece (32) is aluminum alloy with low melting point, and the welding wire: the diameter is 2.5-4mm;

[0027] Step 2: Clamp the steel / aluminum or titanium / aluminum sheets with rigid fixtures and copper backing plates, and assemble them into butt joints, ensuring that the gap matches the size of the forming groove to obtain a suitable rear forming size;

[0028] Step 3: Assemble the wire guide nozzle of the wire feeder with the wel...

Embodiment 2

[0033] Example 2: Combining figure 2 , the perforated type TIG arc melting and brazing method of dissimilar metals of the present invention forms a dynamically changing molten pool: 1) weld seam solidification and workpiece heating, in the melting and brazing process, along with the welding torch moves forward, the liquid aluminum molten pool flows from the slope The mouth and the edge of the weld begin to solidify, forming an oval molten pool, such as figure 2 (a). At the same time, the TIG arc heats the groove, and the temperature of the groove gradually increases; 2) The perforated molten pool is formed, and after a period of heating by the TIG arc, the temperature inside the groove gradually increases. The number of electrode spots on the side of the high melting point workpiece (31) increases, and the electrode spots greatly reduce the interfacial tension, and the liquid metal gradually spreads forward along the groove of the workpiece (31). At the same time, the larg...

Embodiment 3

[0034] Example 3: Binding figure 1 , image 3 , taking the titanium alloy plate and aluminum alloy plate with a thickness of 2mm as the workpiece to be welded as an example to illustrate the implementation steps of this embodiment.

[0035] Step 1: Make a 45° unilateral bevel on the side of the titanium alloy, and process a 0.5mm blunt edge. The filling material is AlCu6 welding wire with a diameter of 3mm. The forming groove on the copper backing plate is 4mm wide and 3mm deep, and a MAG welding wire feeder is used. Carry out inching wire feeding;

[0036] Step 2: Clamp the titanium plate and the aluminum plate on the copper backing plate, so that the root gap of the butt joint groove is 1.5-2mm, and the groove gap is located above the center of the forming groove;

[0037] Step 3: Assemble the wire guide nozzle (2) of the wire feeder and the TIG welding torch (1) as one, and feed the wire from the aluminum alloy side at an angle of 30°. Place the TIG welding torch clamped...

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Abstract

The invention provides a perforated TIG (Tungsten Inert Gas) arc melting brazing method of a dissimilar metal. The perforated TIG (Tungsten Inert Gas) arc melting brazing method of the dissimilar metal comprises the following steps that: a steel / aluminum or titanium / aluminum plate is clamped by a rigid clamp and a copper base plate to be assembled into butt joints, and the matching between a gap and the size of a molding groove is ensured; a guidewire mouth of a wire feeder and a welding gun are assembled into a whole, the wire feeding angle is 30 to 45 degrees, the wire is fed at a low-melting-point metal side, and the distance between a tungsten electrode and a workpiece is controlled in a range of 2-3mm; after small perforated holes obviously grow up, welding wires are sent to the small perforated holes along the low-melting-point metal side in an inching wire feeding mode, and continuously flow along a groove until a molten pool is spread at the front and back of the groove, and the inching wire filing is continuously carried out after the obvious small perforated holes are formed; and the steps are repeated until the melting brazing process is finished. The plasma pressure in the perforated holes promotes the spreading of liquid metal to the back of a high-melting-point metal to realize one-side welding with back formation. Complex equipment and structure do not exist, the operation is simple, the cost is low, and the process stability is good.

Description

(1) Technical field [0001] The invention relates to fusion brazing technology, in particular to a perforated TIG arc fusion brazing method for dissimilar metals. (2) Background technology [0002] Dissimilar metal composite components have the respective physical and chemical properties of the two metals, which are of great significance for weight reduction and low-cost design in aviation, automobile and other fields, and are currently more and more widely used in the production of modern industrial structures. However, when the melting points of the two metals are very different, their physical and chemical properties are very different, and the problem of metallurgical incompatibility is prone to occur. A large number of brittle phases of intermetallic compounds are likely to be produced in the welded joint, which brings great difficulties to the connection of dissimilar metals. difficulty. [0003] The arc melting and brazing technology uses an electric arc as a heating ...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/23
Inventor 吕世雄敬小军黄永宪徐永强郑传奇
Owner HARBIN INST OF TECH
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