Laser welding machine is used in the field of thin plate welding. However, due to improper operation or imperfect technology, pores often appear in the welding process. To solve this problem, we must first analyze the causes of stomata, and then provide corresponding solutions according to the causes. Laser welding machine is used in the field of thin plate welding. However, due to improper operation or imperfect technology, pores often appear in the welding process. To solve this problem, we must first analyze the causes of stomata, and then provide corresponding solutions according to the causes.
Laser welding machine is used in the field of thin plate welding. However, due to improper operation or imperfect technology, pores often appear in the welding process. To solve this problem, we must first analyze the causes of stomata, and then provide corresponding solutions according to the causes. Laser welding machine is used in the field of thin plate welding. However, due to improper operation or imperfect technology, pores often appear in the welding process. To solve this problem, we must first analyze the causes of stomata, and then provide corresponding solutions according to the causes.
The main reason of porosity in laser welding is insufficient protective measures. If nitrogen is used for auxiliary welding, nitrogen will invade the weld pool from the outside. The solubility of nitrogen in liquid iron is very different from that in solid iron, so during the cooling and solidification of the metal; As the temperature decreases, the solubility of nitrogen decreases, and as the metal in the molten pool cools to the point where crystallization begins, the solubility drops sharply. At this point, a large amount of gas will be separated to form bubbles. If the bubbles float faster than the metal crystallizes, pores form.
The inside of the laser welded hole is in an unstable vibration state, and the flow of the hole and the molten pool is very intense. The metal vapor inside the keyhole shoots out, forming a steam vortex at the keyhole opening and drawing the protective gas into the bottom of the keyhole. As the keyhole moves forward, these protective gases will enter the molten pool in the form of bubbles. When argon is used for auxiliary welding, because of the low solubility of argon, the cooling rate of laser welding is very fast, and the bubbles remain in the weld without time to escape and form pores. When the laser welding machine is processed, the laser welding machine needs to blow out protective gas along the coaxial line of the fiber to prevent oxidation of the weld or to prevent the splash of gas after the material is dissolved from polluting the lens. The porosity is mainly caused by improper use or improper operation of the protective gas in the laser welding process, and the reasons for different protective gases to cause the porosity are slightly different.
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