Laser welding method of plates of moderate thickness

A laser welding and laser beam technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of root leakage, easy formation of collapse, poor weld formability, etc., to increase surface tension, The effect of promoting force balance, inhibiting defects such as collapse and root leakage

Inactive Publication Date: 2019-02-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that defects such as collapse and root leakage are easily formed in the current high-power optical fiber laser welding process, and the weld formability is poor

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  • Laser welding method of plates of moderate thickness
  • Laser welding method of plates of moderate thickness
  • Laser welding method of plates of moderate thickness

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Embodiment Construction

[0032] The following will be combined with the attached Figure 1~5 Specific embodiments of the present invention will be described in detail.

[0033] In this embodiment, a laser welding method for a medium-thick plate includes the following steps.

[0034] Step 1: Provide the first base material 1 and the second base material 2, both of which are stainless steel plates with a thickness of 12 mm to 18 mm. Before welding, use an organic solvent to remove surface oil, impurities, etc.

[0035] Step 2: Provide a slag plate 3 for welding with a thickness of 1 mm~3 mm and a composition of MnO, MgO, FeO and Al 3 o 2 at least two of them.

[0036] Step 3: Accurately butt the first base material 1 and the second base material 2 with a special fixture.

[0037] Step 4: The slag plate 3 is placed directly under the first base material 1 and the second base material 2, and is closely attached to the first base material 1 and the second base material 2, and then clamped with a specia...

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Abstract

The invention provides a laser welding method of plates of moderate thickness. The laser welding method is characterized by comprising the steps of (1) providing a first base metal and a second base metal; (2) providing a slag plate for welding; (3) accurately butting the first base metal and the second base metal; (4) putting the slag plate just below the first base metal and the second base metal, and tightly abutting with the first base metal and the second base metal; (5) irradiating high-power laser beams formed by focusing of a laser welding head on the upper surfaces of the first base metal and the second base metal, so that the penetration welding of the first base metal and the second base metal and the slag plate is realized; (6) removing the slag plate by adopting a machining method; and (7) removing bottom welding seams of the first base metal and the second base metal by adopting the machining method. According to the laser welding method, the slag plate is arranged at thebottom of the first base metal and the second base metal, and oxide with a large high-melting point surface tension coefficient in the slag plate is adsorbed on the surface of a bottom molten pool during laser welding, so that the surface tension of the bottom molten pool is greatly increased, the stress balance of the laser welding molten pool is effectively promoted, and the defects of collapse, root exposure and the like during laser welding of the plates of moderate thickness are avoided.

Description

technical field [0001] The invention relates to a welding method, in particular to a laser welding method for medium and thick plates. Background technique [0002] Laser welding is one of the most widely used advanced processes in laser processing technology. It has the advantages of small welding heat input, large weld depth-to-width ratio, fast speed, small weld deformation and low residual stress, high welding precision and strength, large penetration depth, It has outstanding advantages such as easy realization of automation, and has been applied in important industries of the national economy such as automobiles, shipbuilding, nuclear power, and pipelines. [0003] In recent years, with the continuous commercialization of high-power fiber lasers, laser welding of medium and thick plates has attracted more and more attention from the industry. However, the flat welded joints of pure laser welded medium and thick plates are prone to defects such as collapse and root lea...

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Application Information

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IPC IPC(8): B23K26/24B23K26/60B23K103/04
CPCB23K26/24B23K26/60
Inventor 戴家辉张明军刘子奇张远康
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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