Analysis on Defects Characteristic of Aluminum Oil Cooler Vacuum Brazing Joint
The defects of aluminum oil cooler vacuum brazing joint were studied by metallographic analysis,and the defects causations were interpreted in theory.The results show that when the brazing time and vacuum degree are constant,the defects such as insufficiently melted brazing filler metal,not welded and bad brazing fillet occur at low temperature.The corrosion occurs at too high brazing temperature.Uneven brazing assembly contributes to the defects of not welded;insufficient solder cleanliness attributes to the appearance of holes and slag;the improper clamping fixture material and clamping force are the main reasons for the fin bending.