Myriawatt-level laser double-beam welding method for inhibiting welding liquid column and splashing

Abstract

The invention discloses a myriawatt-level laser double-beam welding method for inhibiting a welding liquid column and splashing, and belongs to the technical field of laser processing. The technical problem that a large welding liquid column is prone to be formed and is evolved to welding splashing according to an existing myriawatt-level high-power laser in a non-penetration welding mode is solved. According to the method, two double-beam lasers which are arranged front and back in the welding direction and are different in light spot size and laser power are adopted for metal material welding, the rear laser beam is large in power and small in light spot diameter and is used for penetration fusion welding, and the front laser beam is small in power and large in light spot diameter and is used for melting base metal shallow metal to form a front molten pool, which is in Communication with a rear molten pool formed through the rear laser beam, during welding, through the mode that part of metal surges of the rear molten pool are guided to enter the front molten pool, the pressure of liquid metal on the front edge of a keyhole of the rear light beam is reduced, a longitudinal liquid column is prevented from growing and being evolved to splashing, and good surface forming of myriawatt-level high-power laser welding is achieved.

Description

technical field

[0001] The invention relates to a 10,000-watt-level laser double-beam welding method for suppressing welding liquid column and splash, and belongs to the technical field of laser processing. Background technique

[0002] The 10,000-watt laser welding technology is a new type of advanced welding technology. Using the ultra-high power density of the 10,000-watt laser, a weld with a larger depth-to-width ratio can be obtained, which can effectively reduce the amount of groove processing and narrow the weld bead. The number of layers and the number of cleaning between layers are reduced, so it has outstanding and efficient technical advantages in the welding of medium and thick plates. However, since the energy density of a 10,000-watt-class laser is much higher than that of a kilowatt-class laser, the intense energy interaction inside the keyhole will produce extremely strong ejected substances such as metal vapor. Under the action of these ejected substances, ...

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