Quality-Inspection for Brazing of Tungsten Carbide and Steel
The main points for inspection of brazing of tungsten carbide and steel are taken on the brazing head and cracks of the tungsten carbide part. The normal welding slot should be even without black spot ,if the slot not filled with solder fully ,its length must be less by 10% than the total length ,meanwhile the welding slot width has to be less than 0.15mm.On the other hand ,if the insert welded is skewed and not comply with the drawing ,the work has to be done again. The slots on tungsten carbide parts are available to be found with the following ways .
1)After cleaned with sand blasting , the inserts have to be washed with kerosene ,and then to carefully inspect by means of eyes or magnifier. If there is crack on the inserts ,a black line emerged apparently on them
.2)Blending 65% kerosene ,30% transformer oil,5% turpentine and little Sudan into solution ,and then put the inserts in the solution for 10~15min,after it ,washing with clear water and brush with a lay of kaoline, finally to check its surface after dried .If there is crack on the tools ,the solution color is seen on the kaoline clay with eyes.
