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Dissimilar metal material brazing method

A technology of dissimilar metals and brazing methods, applied in the direction of welding/cutting media/materials, metal processing equipment, welding equipment, etc., can solve problems affecting welding quality, etc., to avoid electrochemical corrosion, increase reliability, and avoid environmental problems the effect of pollution

Active Publication Date: 2011-08-17
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also for the brazing between stainless steel and aluminum or aluminum alloy, stainless steel and magnesium alloy, because it is easy to form layered brittle intermetallic compounds to affect the welding quality, the existing brazing method has been difficult to achieve high-efficiency and high-quality welding

Method used

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  • Dissimilar metal material brazing method
  • Dissimilar metal material brazing method
  • Dissimilar metal material brazing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] see figure 1 , select 6061 aluminum tube 1 and T2 copper tube 2, both of which have an outer diameter of 8mm and a wall thickness of 1mm. The solder used is Zn-4.7Al-0.5Cu (wt.%) flux-free solder paste 3, the solder has a solidus temperature of 380°C and a liquidus temperature of 397°C. Use a reamer to expand the mouth of one end of the aluminum tube 1 into a V shape. The angle between the flared slope and the center line of the tube is 30°, and the length of the slope is 5mm. Chamfering, flared slope, chamfered slope, and the straight pipe surface above the chamfered slope and opposite to the flared slope during welding are divided into welding surfaces.

[0038] see figure 1 , put the flared end of the aluminum tube 1 upright on the fixed fixture 7, and the chamfered end of the copper tube 2 faces down and align the flared end of the aluminum tube 1 vertically on the retractable fixture 8 , evenly fill the solder paste 3 in the V-shaped groove at the joint between ...

Embodiment 2

[0040] see figure 2 , select T2 copper rod 1 and 6061 aluminum alloy rod 2 as the base material, the diameter of the base material is 6mm, and the length is 40mm. A disc solder 3 with a composition of Zn-4.7Al-0.5Cu (wt.%), a diameter of 6 mm, and a thickness of 400 μm is selected. The solidus temperature of the solder is 380 °C and the liquidus temperature is 397 °C. Use No. 400 water abrasive paper to grind one end surface of the base metal as a welding surface, and use ethanol to ultrasonically clean the base metal and the brazing filler metal 3 .

[0041] see figure 2 , the copper rod 1 is vertically mounted on the fixed fixture 7 with its ground end facing upward, the aluminum alloy rod 2 is ground downward and the ground end of the copper rod 1 is vertically mounted on the retractable fixture 8 , the disc brazing filler metal 3 is preset between the copper and aluminum rod ground flat end faces. The other end of the aluminum alloy rod 2 is subjected to a pre-pressur...

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Abstract

The invention discloses a dissimilar metal material brazing method. The dissimilar metal material includes a first base metal and a second base metal different from each other. The method comprises the following steps: clamping the first base metal on a telescopic fixture and clamping the second base metal on a fixed fixture in such a manner that the welding surfaces of the first base metal and the second base metal face to each other, and placing a solder between the welding surfaces; applying a pre-pressure on the first base metal relative to the welding surface; locally rapidly heating thewelding parts of the first base metal and the second base metal to a preset temperature and keeping the temperature; increasing the pre-pressure to a welding pressure; applying ultrasonic vibration to the first base metal relative to the welding surfaces by an ultrasonic compression bar; and continuously keeping the temperature and the pressure after the ultrasonic vibration completes, stopping heating, and further keeping the pressure until the welding parts are cooled. The method can improve the strength of a brazed joint of dissimilar metal materials by reducing the formation of laminar brittle intermetallic compounds and the like.

Description

technical field [0001] The invention relates to a brazing method between metal materials, especially a brazing method suitable for welding heterogeneous metal materials such as copper or copper alloy and aluminum or aluminum alloy, stainless steel and aluminum or aluminum alloy, stainless steel and magnesium alloy Welding method. Background technique [0002] In recent years, domestic and international copper prices have continued to rise, which has brought great cost pressures to manufacturing industries such as refrigeration, electronics, and automobiles. The main application value of copper is that this material has excellent electrical and thermal conductivity. Due to the small amount of copper stored in the earth's crust, there is no doubt that the price of copper will continue to rise. Therefore, it is a common starting point for companies to save costs to find a material with performance close to that of copper and a relatively low price to replace copper. The elect...

Claims

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Application Information

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IPC IPC(8): B23K1/06B23K35/24
Inventor 李明雨计红军肖勇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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