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A thick plate ultra-high power laser-deep penetration tig hybrid welding method

A compound welding and deep penetration technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of difficulty in controlling the shape of the weld surface, poor stability, and welding spatter, so as to reduce the surface oscillation of the molten pool, Effect of reducing shear stress, improving welding quality and efficiency

Active Publication Date: 2022-06-28
HARBIN WELDING INST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention solves the problem of difficulty in controlling the shape of the weld surface caused by welding spatter and serious welding subsidence in the process of ultra-high-power laser welding of thick plates, and the problem of poor stability in the process of ultra-high-power laser-traditional TIG composite welding of thick plates. A method of ultra-high power laser-deep penetration TIG hybrid welding for thick plates is proposed

Method used

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  • A thick plate ultra-high power laser-deep penetration tig hybrid welding method
  • A thick plate ultra-high power laser-deep penetration tig hybrid welding method
  • A thick plate ultra-high power laser-deep penetration tig hybrid welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, a 40mm-thick low-carbon steel plate is used to perform ultra-high-power laser-deep penetration TIG composite welding of the thick plate.

[0035] Using 30KW ultra-high power continuous fiber laser, the laser wavelength is 1070nm, and the laser focusing diameter is 0.69mm.

[0036] Using a rated current of 630A deep penetration TIG welding machine and welding gun.

[0037] S1, grind and clean the surface of the workpiece to be welded, and clamp it on the welding platform with a fixture.

[0038] S2, use the fixture to rigidly fix the ultra-high power laser head and the deep penetration TIG welding torch, the ultra-high power laser and the normal direction of the workpiece surface are inclined 15 degrees, and the deep penetration TIG welding torch and the laser head are inclined 35 degrees.

[0039] S3, set the welding parameters, specifically: the laser power is 20KW, the defocus amount is -10mm, the diameter of the deep penetration TIG tungsten electrode...

Embodiment 2

[0042] The difference between this example and Example 1 is that the laser output power during welding is 30KW, and the rest of the parameter settings and operation process are the same as those of Example 1. The obtained weld is as follows Figure 5 shown in (c).

Embodiment 3

[0044] In this example, a 40mm-thick low-carbon steel plate is used for ultra-high-power single-laser welding of the thick plate.

[0045] Using 30KW ultra-high power continuous fiber laser, the laser wavelength is 1070nm, and the laser focusing diameter is 0.69mm.

[0046] S1, grind and clean the surface of the workpiece to be welded, and then clamp it on the welding platform with a fixture.

[0047] S2, the ultra-high-power laser head is rigidly fixed by a fixture, and the ultra-high-power laser is inclined 15 degrees to the normal direction of the workpiece surface.

[0048] S3, set the welding parameters, specifically: the laser power is 20KW, and the defocus amount is -10mm. The welding speed is 1.2m / min. The protective gas is 99.999% high-purity argon, and the gas flow is 20L / min.

[0049] S4, pre-pass the shielding gas, start the laser incident, and move the laser head relative to the workpiece to be welded, perform ultra-high-power single-laser welding, and obtain w...

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Abstract

The invention discloses a thick plate ultra-high power laser-deep penetration TIG composite welding method, which belongs to the technical field of thick plate ultra-high power laser welding. The invention solves the problems of difficulty in controlling the shape of the weld seam surface caused by welding spatter and severe subsidence in the existing ultra-high-power laser welding process of thick plates, and poor stability of the ultra-high-power laser-traditional TIG composite welding process for thick plates. The invention injects the ultra-high power laser into the "keyhole" of the deep-melting TIG arc, and utilizes the high stiffness and strong penetrating power of the deep-melting TIG arc to forcibly expand the opening area of ​​the "keyhole" of the ultra-high power laser while constraining the laser The metal liquid column at the opening of the "keyhole" flies out of the surface of the molten pool to achieve the purpose of suppressing spatter in ultra-high power laser welding of thick plates, improving the shape of the upper surface of the weld and improving the stability of the welding process.

Description

technical field [0001] The invention relates to a thick plate ultra-high power laser-deep penetration TIG composite welding method, which belongs to the technical field of thick plate ultra-high power laser welding. Background technique [0002] Thick plate welding technology is one of the most critical manufacturing technologies for large-scale structural parts in many national economic fields such as aerospace, marine engineering, petrochemicals, ships and bridges, and it greatly affects the manufacturing efficiency and quality of final products. At present, the widely used medium and thick plate welding technologies mainly include large-angle groove multi-pass arc welding and small-angle groove narrow-gap submerged arc welding, but with the gradual application of larger-sized structures and higher-strength materials, its Production efficiency and joint quality have been difficult to meet the requirements of modern welding technology. [0003] Laser welding technology is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/348
CPCB23K26/348
Inventor 黄瑞生方迪生滕彬蒋宝韩鹏博聂鑫邹吉鹏曹浩方乃文李小宇
Owner HARBIN WELDING INST LTD
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