① Use the carbide flame to prevent the hard alloy from decarburization or over-burning during the brazing process.
② The brazing temperature is about 1000℃, that is, the cemented carbide will be bright red when heated. If it is dark red or bright white, it cannot be brazed.
③ The torch is heated repeatedly from left to right, from right to left, and from top to bottom to make it uniformly heated.
④ During brazing, the distance between the welding tip and the weldment is about 50mm, and the tip angle is 110°, which can ensure effective use of flame heat and heating balance. During the brazing process, the flame should always cover the entire brazing part and isolate it from the air to prevent oxidation or pores.
⑤ The brazing speed should be determined according to the size of the weldment to prevent overburning or decarburization of the cemented carbide.
⑥ After brazing, heat with flames, and then slowly move the welding tip away to cool the weldment slowly to prevent cracks.
