Ultrahigh-power laser-deep penetration TIG composite welding method for thick plate

A hybrid welding and laser welding technology, used in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of difficult welding surface forming control, welding spatter, poor stability, etc., to reduce the surface oscillation of the molten pool, The effect of reducing shear stress, improving welding quality and efficiency

Active Publication Date: 2022-01-18
HARBIN WELDING INST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Ultrahigh-power laser-deep penetration TIG composite welding method for thick plate
  • Ultrahigh-power laser-deep penetration TIG composite welding method for thick plate
  • Ultrahigh-power laser-deep penetration TIG composite welding method for thick plate

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Effect test

Embodiment 1

[0034] In this embodiment, a low-carbon steel plate with a thickness of 40 mm is used for ultra-high power laser-deep penetration TIG composite welding of thick plates.

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

[0036] Use rated current 630A deep penetration TIG welding machine and welding torch.

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

[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 is inclined 15 degrees to the normal direction of the workpiece surface, and the deep penetration TIG welding torch is inclined 35 degrees to the laser head.

[0039] S3, set the welding parameters, specifically: the laser power is 20KW, the defocus is -10mm, the diameter of the deep penetration TIG tungsten electrode is 4....

Embodiment 2

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

Embodiment 3

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

[0045] A 30KW ultra-high power continuous fiber laser is used, 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 clamp.

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

[0048] S3, setting 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 rate is 20L / min.

[0049] S4, pre-pass the shielding gas, start the laser incidence, and move the laser head relative to the workpiece to be welded, perform ultra-high power singl...

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Abstract

The invention discloses an ultrahigh-power laser-deep penetration TIG composite welding method for a thick plate, and belongs to the technical field of thick plate ultra-high power laser welding. The problems that in an existing ultrahigh-power laser welding process of the thick plate, welding spatter and collapse are serious, so that the welding seam surface forming control difficulty is large, and the stability of the ultrahigh-power laser-traditional TIG composite welding process of the thick plate is poor are solved. According to the method, an ultra-high power laser is emitted into a deep penetration TIG electric arc key hole, an opening area of the ultra-high power laser key hole is forcibly enlarged by means of the high stiffness and the high penetrating power of a deep penetration TIG electric arc, meanwhile, a metal liquid column at an opening of the laser key hole is restrained from flying out of the surface of a molten pool, the purposes of restraining ultrahigh power laser welding splashing of the thick plate and improving the welding quality are achieved, the welding seam upper surface forming is improved, and the welding process stability is improved.

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, petrochemical industry, ship bridges, etc. 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-layer multi-pass arc welding and small-angle groove narrow gap submerged arc welding. However, with the gradual application of larger-scale structures and higher-strength materials, other Production efficiency and joint quality have been difficult to meet the requirements of modern welding technology. [0003] Laser...

Claims

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Application Information

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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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