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A Study on the Strength of Brazed Joint for Automotive EGR Cooler by Heat Treatment Conditions  

Lee, Joon (Dept. of Robotic Engineering, Hoseo University)
Han, Chang-Suk (Dept. of Defence Science & Technology, Hoseo University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.22, no.4, 2009 , pp. 210-216 More about this Journal
Abstract
Stainless steel EGR cooler of diesel engine is widely used to prevent the corrosion due to the content of sulfur in diesel fuel. The strength of brazed joint between stainless steel materials is very important. It is essential to observe the spreading ratio of the filler metals under the condition of deoxidation or vacuum during heating process. In this experiment, spreading ratio was tested to find the optimum brazing condition for stainless steel using brazing filler metals of FP-613, BNi-2 and BNi-5 on sus304 and sus410. Anti-corrosion tests were also performed on the above filler metals with solution of 5% $H_2SO_4$, 65% $HNO_3$ and 5% $NH_4OH$. Consequently FP-613 has good ability for anti-corrosion with 30% of chromium content compared with other filler metals. The optimum brazing conditions are occurred at $960^{\circ}C$ for 90 min. and at $1090^{\circ}C$ for 50 min. at the same degree of vacuum, $2{\sim}3{\times}10^{-3}$ Torr.
Keywords
EGR(exhaust gas recirculation); brazing filler metals; spreading ratio;
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  • Reference
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