① Before welding, check whether the cemented carbide has cracks or unevenness defects. The brazing surface must be flat to ensure good contact between the alloy and the substrate to ensure the brazing quality.
② Carry out sandblasting treatment on the cemented carbide or grind on the green silicon carbide grinding wheel to remove the oxide layer on the surface, otherwise the brazing filler metal will not easily wet the cemented carbide.
③ When cleaning the hard alloy brazing surface, it is best not to use chemical mechanical grinding or electrolytic grinding, because after the cobalt on the hard alloy surface is corroded, it is difficult for the solder to wet the hard alloy again. Causes desoldering phenomenon.
④ Before brazing, check carefully whether the groove shape on the steel substrate is reasonable, and the embedded groove should also be sandblasted and cleaned to remove oil stains.
⑤ Wipe the brazing filler metal with alcohol or gasoline before use and cut it into shape according to the brazing surface. The thickness of the brazing material is about 0.4-0.5mm, and the size is similar to the brazing surface.
