In order to ensure the quality of welding, a careful inspection should be carried out to find out the cause of defects. Before the inspection, the tool should be sandblasted or gently ground to adhere to the solder and impurities on the blade surface, and clean with kerosene.

Check items and requirements.

Check weld strength

After the green silicon carbide grinding wheel is used to grind the back of the cutter, check the thickness of the solder layer, and the thickness is below 0.15mm. No holes and solder defects can be found at the base of the blade, and the welding seam should not be more than 10% of the total length of the weld. If there is a hole, the blade will fall off when cutting.

Check the position of the blade in the knife slot.

If the blade is misaligned and sagging exceeds the technical conditions, rewelding shall be performed.

Check welding strength

Use a wooden hammer or a copper hammer to hit the blade with medium strength or with a hammer with a strong stroke. The blade is not removed from the knife slot to be qualified. Check the welding strength of cemented carbide welding blade, not necessarily each inspection, also use spot check method.

Check the blade flatness

If there are obvious pits on the blade, the blade should be overheated and deformed, and the welding blade should be fired.

Check the crack

When the blade is cleaned by kerosene, if the blade is cracked, the kerosene seeps into the crack and the black line is visible to the naked eye. It can also be observed with a magnifying glass of 10-40 times.

Check the blade crack, and also use color flaw detection: 65% of kerosene, 30% of transformer oil and 5% turpentine solution, slightly more Sudan red. Put tool blade part in 10 to 15 minutes in the solution, then use clean water, coated with a layer of clay (kaolin), the surface was observed after baking thousand, if there is crack on the cemented carbide welding blade, then the color of the solution was revealed on clay, with the naked eye can see. The cracked blade cannot be used and needs to be resoldered.

In addition to the several commonly used car 7J welding methods mentioned above, there are methods such as oil protection, electric furnace, forge furnace and brazing furnace with reducing gas.

Related link: http://www.wococarbide.com/

Posted by: hannahgwendolyn at 09:39 AM | No Comments | Add Comment
Post contains 412 words, total size 3 kb.