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Analysis of Cracks in Laser Welding

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Analysis of Cracks in Laser Welding

Postautor: laserman123 » 13 lip 2017, 07:59

Laser welding machine is the use of high-energy pulse laser focus on the melting of the target metal to the workpiece between the welding. This new welding technique works very well, but if handled improperly, it can also cause hot cracking or cold cracking. So how does the welding crack of the green laser pointer welding machine produce?

Metallurgical factors:

Laser welding is not a balance of rapid heating and rapid cooling characteristics, making the entire joint in a complex state of stress, forming a joint cracking of the mechanical factors; laser welding is a series of unbalanced process integration, in the rapid metallurgical solidification process, There will be uneven distribution of composition and low fracture resistance of hardened tissue, etc., which constitute a metallurgical factors to promote the initiation of the crack.

Mechanics:

Laser welding machine welding process produced three main cracks: knot cracks, liquefied cracks and reheat cracks. Crystalline cracks are related to the compositional heterogeneity of the weld macroscopic region. The central area of the weld is the latest part of the liquid phase crystallization, where the columnar crystals on both sides of the weld intersect at the same time, and a large number of low melting impurities are also accumulated here to form a centerline segregation, thereby reducing the bonding strength. Under certain mechanical conditions, the crack is produced in this area.

Know the cause of the crack, we should pay attention to the life of red laser pointer welding machine operation, try to avoid the operating causes of welding defects.

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