How to Check the Welding Quality of Blades

Color flaw detection method can also be used to check the crack of crusher blade: 65% kerosene, 30% transformer oil and 5% turpentine are used as the solution, and a little Sudan red is added. Place the blade of the turning tool in this solution for 10-15 minutes, rinse with clean water, apply a layer of white clay (kaolin), and observe its surface after baking. If there are cracks on the blade, the color of the solution will be exposed on the white clay, which can be seen with the naked eye. Cracked blades cannot be used and need to be re welded.

Check for cracks: If the blade has cracks after being cleaned with kerosene. Kerosene seeps into the cracks and black lines appear, which can be observed with the naked eye. It can also be observed with a 10 to 40x magnifying glass.

Check the flatness of the blade: If there are obvious pits on the blade, it indicates that the blade is overheated and deformed. It should be burned down and re welded with a new blade.

Check welding strength: Use a wooden or copper hammer to strike the blade with moderate force, or use an I-hammer to strike the blade with strong force. If the blade does not detach from the groove, it is considered qualified. Check the welding strength of the blades, not necessarily one by one, but also through spot checks.

Check the position of the blade in the slot: if the blade is misaligned or sagging exceeds the specifications. Re welding should be carried out.

Check the strength of the welding seam of the crusher blade: Grind the back of a turning tool with a green silicon carbide grinding wheel, and check the thickness of the solder layer. The thickness is required to be below 0.15 millimeters. There should be no air holes or insufficient solder at the bottom surface of the tool tip support, and the weld seam that is not filled with solder should not exceed 10% of the total length of the weld seam. If there are pores, it will cause the blade to fall off during cutting.