Influence of Welding Temperature on Vacuum Brazing of WC-Co Cemented Carbide and Low Carbon Steel
WC-Co cemented carbide was joined with low carbon steel using HL105 solders by vacuum brazing.The influences of welding temperature on the microstructure and properties of WC-Co/steel joints were investigated systematically.The results show that WC-Co and low carbon steel are successfully joined by using solder HL105.With the increase of brazing temperature,the flowability and wettability of solder HL105 increase.Simultaneously,the elements of solder evaporates,the width of the seam welding decreases and the grains of WC-Co and steel grow.The tensile strength of the welded joints increases ?rstly and then decreases with the brazing temperature increasing.The maximum tensile strength of the welded joint is 263.9 MPa at 980℃.