Narrow-gap double-beam laser wire filling welding method based on welding seam gradient solidification control

A technology of laser wire filling and welding methods, which is applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of easy crystallization cracks in the center of the weld, solve the problem of unfused defects on the side wall, and improve the quality of the deposited metal. Volume, to solve the effect of more pores

Pending Publication Date: 2021-07-30
HARBIN WELDING INST LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that crystal cracks are easily generated at the center of the weld in the existing thick plate narrow-gap laser wire-fill welding process, the present invention provides a narrow-gap double-beam laser wire-fill welding method based on weld gradient solidification control

Method used

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  • Narrow-gap double-beam laser wire filling welding method based on welding seam gradient solidification control
  • Narrow-gap double-beam laser wire filling welding method based on welding seam gradient solidification control
  • Narrow-gap double-beam laser wire filling welding method based on welding seam gradient solidification control

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Embodiment 1

[0026] Carry out welding of high-strength steel plates with a thickness of 120mm. The specific welding process is as follows:

[0027] Step 1: The test base material is 10Ni5CrMoV high-strength steel, the profile state is quenched and tempered state, the plate size is 500×200×120mm, and the joint form is double-sided butt joint, such as image 3 As shown, a 1° groove is opened, the gap at the root of the groove is 3.2mm, and the blunt edge of the groove is 40mm thick. The welding wire used is JS80 welding wire with a diameter of Φ1.2mm.

[0028] Step 2: Use 10,000-watt-level high-power laser deep penetration welding to realize double-sided and double-pass penetration welding with large thickness blunt edges to achieve efficient bottom welding; use dual-beam laser gradient cooling to control efficient filling welding process, and select large wire feed Filling, increase the amount of deposited metal in a single-layer filling bead, and improve the efficiency of single-pass fill...

Embodiment 2

[0032] Carry out welding of high-strength steel plates with a thickness of 40mm. The specific welding process is as follows:

[0033] Step 1: The test base material is 10Ni5CrMoV high-strength steel, the profile state is quenched and tempered state, the plate size is 500×200×40mm, the joint form is single-sided groove, the thickness of the plate is 40mm, the thickness of the blunt edge of the groove is 10mm, and the root gap is 3.2mm, the groove angle is 1°, and the welding wire used is JS80 welding wire with a diameter of Φ1.2mm.

[0034] Step 2: Use 10,000-watt-level high-power laser deep penetration welding to achieve single-pass penetration welding of large-thickness blunt edges to achieve efficient bottom welding; use dual-beam laser gradient cooling to control efficient filling welding process, and choose large wire feed for filling. Increase the amount of deposited metal in a single-layer filling bead and improve the efficiency of single-pass filling. Welding parameter...

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Abstract

The invention discloses a narrow-gap double-beam laser wire filling welding method based on welding seam gradient solidification control, and belongs to the technical field of laser processing. The method solves the problem that in the existing thick plate narrow-gap laser wire filling welding process, crystal cracks are likely to be generated in the center of a welding seam. According to the method, in the multi-pass filling welding process of a narrow-gap groove, a front laser beam is adopted as a main heat source for melting a welding wire and used for achieving welding filling of the narrow-gap groove, and the front laser beam can adopt a large laser spot or a laser swing mode to control the defects of air holes in the welding seam, incomplete fusion of the side wall and the like; and a rear laser beam serves as a thermal compensation auxiliary heat source and is used for controlling the solidification sequence of a molten pool for forming a large-depth-to-width-ratio laser welding seam during large-wire-feeding-amount filling, and therefore gradient sequential solidification from bottom to top is achieved, welding crystal cracks are prevented from being generated, and the efficiency of the welding process method is improved.

Description

technical field [0001] The invention relates to a narrow-gap double-beam laser wire-filling welding method based on weld gradient solidification control, which belongs to the technical field of laser processing. Background technique [0002] Narrow gap welding technology has a significant advantage in deposition efficiency in thick plate welding technology. Among them, thick plate narrow gap laser welding method is a high-efficiency and high-quality welding technology, which takes into account the advantages of narrow gap welding and laser welding. The gap groove needs to be filled with less metal, and it overcomes the shortcomings of traditional arc welding, such as large heat damage, coarse weld grains, and low welding efficiency. However, when using this method to weld thick plates, due to the small groove width, when the filling amount is large, the molten metal of the single-layer weld is large in the depth direction, and the weld depth-to-width ratio is large (that is,...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B23K26/24B23K26/14B23K26/70
CPCB23K26/24B23K26/14B23K26/702
Inventor雷振黄瑞生曹浩孙谦蒋宝徐楷昕
OwnerHARBIN WELDING INST LTD