1. The brazing surface of tungsten carbide strip has not been sandblasted or polished before welding. The oxide layer on the brazing surface reduces the wetting effect of the brazing material and weakens the bonding strength of the weld. 2. Desoldering can also occur due to improper selection and use of the flux. For example, when borax is used as the flux, the raw borax cannot effectively deoxidize due to its high water content. As a result, the solder cannot be well wetted and brazed surface, and the phenomenon of desoldering occurs. 3. The correct brazing temperature should be 30-50°C above the melting point of the brazing filler metal. Desoldering will occur if the temperature is too high or too low. Excessive heating will cause oxidation in the weld. The use of zinc-containing solder will make the weld bluish or white. When the brazing temperature is too low, a relatively thick weld will be formed, and the inside of the weld is full of pores and slag inclusions. The above two conditions will reduce the strength of the weld, and desoldering is easy to occur when sharpening or using. 4. During the brazing process, the slag discharge is not timely or insufficient, so that a large amount of flux slag remains in the weld, which reduces the strength of the weld and causes desoldering.
If you have any questions for the desoldering of tungsten carbide strips, please feel free to contact info@maxcarbide.com
