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How to check the quality of blade welding?

Time：

2020-02-10 10:45

       In order to ensure the quality of welding, the blade after welding should be carefully inspected to find the cause of the defect and improve it. Prior to inspection, the blade should be sandblasted or lightly ground to remove solder and impurities adhering to the blade surface, and cleaned with kerosene. The inspection items and requirements are as follows:
 
       First, check the strength of the weld: Grind the back of a blade with a green silicon carbide grinding wheel, and check the thickness of the solder layer. There should be no pores and insufficient solder at the bottom surface of the blade tip support. The weld that is not filled with solder should not be greater than 10% of the total length of the weld. If there are air holes, the blade will fall off during cutting.
 
       Second, check the position of the blade in the sipe: If the blade is misplaced and sags more than the technical conditions, it should be re-welded.
 
       Third, check the welding strength: Use a wooden hammer or copper hammer to strike the blade with a medium force, or use an I hammer to strike the blade with a strong force. At this time, the blade does not fall off the blade body. Check the welding strength of the blades. It is not necessary to check the welding strength one by one.
 
       Fourth, check the blade flatness: if there are obvious pits on the blade, it means that the blade is overheated and deformed, and the new blade should be burned and re-welded.
 
       Fifth, check the crack: After the blade is cleaned with kerosene, if the blade has cracked kerosene, it will penetrate into the crack and appear black lines, which can be observed with the naked eye. Can also be observed with a 10-40 times magnifying glass.
 
       To check the blade crack, you can also use the color flaw detection method: 65% kerosene, 30% transformer oil, and 5% turpentine solution, slightly added Sudan red. Place the cutter blade part in the solution for 10-15 minutes, and then wash it with water, then apply a layer of white clay (kaolin), and observe the surface after drying. If there are cracks on the blade, the color of the solution will be in white clay. The upper part is exposed and can be seen with the naked eye. Cracked blades cannot be used and need to be re-welded.
 
       In addition to the several commonly used car 7J welding methods introduced above, there are also methods such as brazing in oil guards, electric furnaces, forge furnaces, and furnaces with reducing gases, which are not described here in detail.

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