Copper and stainless steel dissimilar metal water adapter vacuum brazing technology method

A technology of dissimilar metals and brazing technology, applied in metal processing equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of large differences in melting point, thermal conductivity and linear expansion coefficient, etc., and achieve reliable and improved methods The effect of high product qualification rate and high production efficiency

Active Publication Date: 2008-06-18
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

Due to the special structure of the water joint, the stainless steel water box needs to be welded with different metals with the copper lining pipe and the copper L support respectively. These two metal materials are obviously diffe

Method used

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  • Copper and stainless steel dissimilar metal water adapter vacuum brazing technology method
  • Copper and stainless steel dissimilar metal water adapter vacuum brazing technology method
  • Copper and stainless steel dissimilar metal water adapter vacuum brazing technology method

Examples

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Example Embodiment

[0036] Embodiment: The vacuum brazing process for a water joint of copper and stainless steel dissimilar metals includes the following steps:

[0037] The first step is to process the various parts of the water joint, including the copper L support, the copper lining pipe, and the stainless steel water tank to control the processing accuracy and the assembly gap of related components. Taking into account the difference in melting point, thermal conductivity and linear expansion coefficient of copper and stainless steel vacuum brazing, when making stainless steel water tank and copper lined pipe, ensure that the assembly gap (diameter difference) is 0.04mm-0.14mm; processing copper When the L support and the stainless steel water box, ensure that the diameter of the inner hole of the L support matches the outer diameter of the top of the water box, and ensure the flatness of the horizontal mating surface, so that it is in close contact with the foil-shaped silver copper palladium s...

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Abstract

The invention discloses a vacuum brazing technology method between copper and stainless steel dissimilar metal water connector, comprising processing each part of the water connectior, controling the processing precision and component assembly clearance; washing the part of water connectior; assembling water connections and putting in special fixture. Put the fixture in vacuum brazing furnace and carry out braze welding according to the following brazing technology: 1) take 35 minutes to make the furnace temperature to rise to 650 DEG C at a uniform speed; 2) continue to preserve heat for 20 minutes; 3) rise the furnace temperature at a uniform speed to 890 DEG C in 20minutes; 4) continue to preserve the heat for 20 minutes; 5) then rise the furnace temperature to 970 DEG C+-10 DEG C at a uniform speed in 15 minutes; 6) Continue to preserve heat for 5 minutes; 7) then stop heating and cool naturally; 8) on the next day take out the water connector from the fixture; 9) carry out the acceptance test by using the ultrasonic automatic testing device. The technical problem that the annular gap of the water connector is not fully filled and can be corroded is solved; the invention has the advantages of reliable method and high production efficiency, and can effectively improve the qualified rate of the products.

Description

Technical field [0001] The invention relates to dissimilar metal welding technology, in particular to a welding process method for a water joint of copper and stainless steel dissimilar metals. Background technique [0002] Copper and stainless steel dissimilar metal water joints are important components of the stator coils of super large hydro-generators, and their manufacturing quality has an important impact on the safe operation of the motor. [0003] Copper and stainless steel dissimilar metal water joints are mainly composed of copper L support, copper lining pipe, stainless steel water tank and soldering brazing filler metal. Due to the special structure of the water joint, the stainless steel water box needs to be welded with the copper lining pipe and the copper L support respectively. The two metal materials are obviously different in physical properties and chemical composition. The melting point, thermal conductivity and The large difference in linear expansion coeffi...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K33/00B23K103/22
Inventor 王世忠俞德怀喻应华范永明樊宝全杨灿湘王军高山
Owner NUCLEAR POWER INSTITUTE OF CHINA
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