Today is 2021-11-27 Saturday,Welcome to this site 

Today is 2021-11-27 Saturday,Welcome to this site 

Common problem

How to check the quality of blade welding?

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In order to ensure the welding quality, the welding tool should be carefully checked, so as to find out the causes of defects and improve. Before inspection, the turning tool shall be sandblasted or lightly ground to remove the solder and impurities adhered on the surface of the blade, and cleaned with kerosene. The inspection items and requirements are as follows:
  1、 Check the weld strength: grind the back of a turning tool with green silicon carbide grinding wheel, and check the thickness of solder layer. The thickness is required to be less than 0.15mm. There should be no porosity and insufficient solder at the bottom of the tool tip support, and the unfilled weld should not be more than 10% of the total weld length. If there are air holes, the blade will fall off during cutting.
  2、 Check the position of the blade in the groove: if the blade dislocation and sagging exceed the technical requirements, re welding shall be carried out.
  3、 Check the welding strength: knock the blade with wood hammer or copper hammer with medium force, or knock the knife bar. If the blade does not fall off from the groove, it is qualified. To check the welding strength of the blade, it is not necessary to check all of them one by one, but also to use the spot check method.
  4、 Check the flatness of the blade: if there are obvious pits on the blade, it indicates that the blade is overheated and deformed, and the new blade should be burned and re welded.
  5、 Check for cracks: after the blade is cleaned with kerosene, if the blade has cracks, kerosene will penetrate into the cracks and appear black lines, which can be observed with naked eyes. It can also be observed with a magnifying glass of 10-40 times.
  To check the blade crack, color flaw detection method can also be used: 65% kerosene, 30% transformer oil and 5% turpentine mixed solution, a little Sudan red. Place the turning tool blade in the solution for 10-15 minutes, then wash it with clean water, coat it with a layer of clay, and observe the surface after drying. If there are cracks on the blade, the color of the solution will be exposed on the clay, which can be seen by naked eyes. The cracked blade cannot be used and needs to be re welded.
  In addition to the common welding methods introduced above, there are also some methods such as oil protection, electric furnace, forge furnace and furnace brazing with reducing gas, which will not be introduced in detail here.

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