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

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...

AI Technical Summary

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 different in physical properties and chemical composition. The melting point, thermal conductivity and The large difference in linear expansion coefficients brings great technological difficulties to the manufacture of such water joints

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