how do you examine welding blade quality?
Answers
In order to ensure the quality of the welding, the welding tool should be carefully inspected in order to find out the cause of the defect and improve it. Before the inspection, the turning tool should be sandblasted or lightly rubbed to remove the solder and impurities adhering to the surface of the blade, and cleaned with kerosene. The items and requirements for inspection are as follows:
First, check the weld strength: use a green silicon carbide grinding wheel to grind the back of a turning tool, check the thickness of the solder layer, the thickness requirement is below 0.15 mm. There should be no porosity and insufficient solder at the bottom of the tool tip support. The welds that are not filled with solder should be no more than 10% of the total length of the weld. If there are air holes, the blade will fall off when cutting.
Second, check the position of the welding blade in the sipe: If the blade is misaligned and sag exceeds the technical conditions, re-welding should be performed.
3. Check the welding strength: use a wooden hammer or a copper hammer to strike the blade with medium strength, or use a hammer to strike the knife bar with a strong force. At this time, the blade does not fall off the sipe to pass. Check the welding strength of the blades, not necessarily one by one, and also use the spot check method.
4. check the flatness of the welding blade: If there is obvious pit on the blade, it indicates that the blade is overheated and deformed, and the new blade should be burned and re-welded.
5. Check the crack: If the welding blade is cleaned by kerosene, if the blade has cracks, the kerosene will penetrate into the crack and a black line will appear, which can be observed with the naked eye. It can also be observed with a magnifying glass of 10-40 times.
Check the blade crack, you can also use the color detection method: using 65% kerosene, 30% transformer oil and 5% turpentine solution, add some Sudan red. Place the turning blade part in the solution 10-15Minutes, then wash with water, apply a layer of clay (kaolin), observe the surface after drying, if there is a crack on the blade, the color of the solution will be revealed on the clay, which can be seen with the naked eye. Cracked blades cannot be used and need to be re-welded.
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