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A Laser Scanning-Based Wire Filling Welding Method for Thick Plates with Narrow Gap

A technology of laser scanning and welding methods, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as unfused interlayers and unfused side walls, achieve sufficient heat input, increase area, and reduce pores Effect

Active Publication Date: 2021-08-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems existing in the prior art, the present invention proposes a narrow-gap thick-plate wire-fill welding method based on laser scanning. The present invention aims at narrow-gap laser wire-fill welding of thick plates, and overcomes the problem of sidewall welding in the thick-plate laser wire-fill welding process. Emergence of lack of fusion and interlayer lack of fusion

Method used

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  • A Laser Scanning-Based Wire Filling Welding Method for Thick Plates with Narrow Gap
  • A Laser Scanning-Based Wire Filling Welding Method for Thick Plates with Narrow Gap
  • A Laser Scanning-Based Wire Filling Welding Method for Thick Plates with Narrow Gap

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Embodiment A

[0055] In this embodiment, the laser does not scan the narrow gap filler wire to weld the Q235 test plate, and the groove form of the test plate is as follows figure 1 As shown, specifically, the Q235 test plate is first polished with sandpaper to remove oxides and impurities on the surface of the Q235 test plate to reveal the metallic luster, and then use acetone to scrub the Q235 test plate; Argon gas with a purity of 99.99% is introduced into the welding gas protection device, and the gas flow rate is 25L / min; adjust the laser welding head so that the angle between the axis of the laser beam emitted by the laser welding head and the vertical direction is 5°; Wire nozzle, so that the angle between the wire feeding nozzle and the plane of the test plate is 45°; turn on the laser, adjust the distance between the light wires to 0mm, and perform single-channel single-layer wire-filled welding along the welding direction, the laser power is 4000W, and the defocus is + 45mm, the w...

Embodiment B

[0057] In this embodiment, the laser scanning narrow gap filler wire welds the Q235 test plate, and the groove form of the test plate is as follows figure 1 As shown, specifically, the Q235 test plate is first polished with sandpaper to remove oxides and impurities on the surface of the Q235 test plate to reveal the metallic luster, and then use acetone to scrub the Q235 test plate; Argon gas with a purity of 99.99% is introduced into the welding gas protection device, and the gas flow rate is 25L / min; adjust the laser swing welding head so that the angle between the axis of the laser beam emitted by the laser swing welding head and the vertical direction is 5°; at the same time Adjust the wire feeding nozzle so that the angle between the wire feeding nozzle and the plane of the test plate is 45°; turn on the laser and scan the laser beam emitted by the laser scanning welding head to perform five-level scanning pre-scanning on the groove area of ​​the low carbon steel test plat...

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Abstract

The invention discloses a laser scanning-based wire-filling welding method for thick plates with narrow gaps. The method comprises the following steps: beveling the thick plates with narrow gaps and performing pretreatment to remove oxide skin on the surface of the region to be welded; After the plate is placed in an atmosphere of inert gas, adjust the laser scanning welding head so that the axis of the laser beam emitted by the laser scanning welding head and the vertical direction form the first angle, and at the same time adjust the wire feeding nozzle for wire filling so that the wire feeding nozzle is in line with the vertical direction. The plane of the narrow-gap thick plate forms a second angle; the laser beam emitted by the laser scanning welding head scans and preheats the groove, the scanning frequency of the laser beam is 50Hz‑100Hz, and the defocus range is +40‑+50mm. The amplitude range of the laser beam is 1.2mm-2.3mm; after preheating, perform single-layer single-pass welding on the area to be welded, clean the weld bead after single-layer welding, and repeat the single-layer single-pass welding immediately after cleaning until it is filled Groove.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a laser scanning-based wire-filling welding method for thick plates with narrow gaps. Background technique [0002] Low-carbon steel, high-strength steel and stainless steel have good processability and good weldability, and are widely used in various fields of national production. Traditional welding methods for thick plates include manual arc welding, tungsten inert gas shielded welding, submerged arc welding, etc. Due to the limitation of the size of the welding torch, the groove of the thick plate welded by traditional arc welding will be relatively large, usually requiring multiple layers. One-pass welding, the welding heat input and deformation are large, and it causes a large consumption of welding materials, and the welding efficiency is low. [0003] Li Liqun of Harbin Institute of Technology and others used C02 lasers to perform laser-assisted hot wire multi-layer fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/211B23K26/082
CPCB23K26/082B23K26/21B23K26/211
Inventor 张林杰张乾乾宁杰龙健吴军张黎旭
Owner XI AN JIAOTONG UNIV
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