How To Check The Quality of Shear Blade Welding?

In order to ensure shear blade welding quality, the welded blades should be carefully inspected to identify the cause of defects and make improvements. Before inspection, the blade should be sandblasted or lightly ground to remove solder and impurities adhering to the surface of the blade, and cleaned with kerosene. The inspection items and requirements are as follows:

1、Check weld strength: Use a green silicon carbide grinding wheel to grind the back of a blade and check the thickness of the solder layer, which should be below 0.15 millimeters. There should be no air holes or insufficient solder at the bottom surface of the tool tip support. The weld seam that is not filled with solder should not exceed one tenth of the total length of the weld seam. If there are pores, the blade will fall off during cutting.

2、 Check the position of the shear blade in the slot: if the blade is misaligned or sagging beyond the technical specifications, it should be re welded.

3、 Check welding strength: Use a wooden hammer 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 fall off from the blade body, it is considered qualified. Checking the welding strength of the blades may not be done individually, and spot checks are also used.

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 should be burned down and re welded with a new blade.

5、 Check for cracks: After cleaning the blade with kerosene, if there are cracks, kerosene will penetrate into the cracks and black lines will appear, which can be observed with the naked eye. It can also be observed with a magnifying glass of 10-40 times.