The contact surface formed by the blade and the sipe causes the uneven distribution of the black holes so that the welding cannot form a flat bond. The uneven distribution occurs so that the solder not only affects the strength of the weld and causes stress concentration, causing the blade to break. Therefore, the grinding contact surface of the boring blade should be clean and the appearance of the welding blade sipe.
The blade holder of the blade that needs to protrude is not more than 0.5mm to receive tensile force and breakage.

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