Pre-filled wire laser ultra-narrow gap welding method for titanium alloy thick plate

A welding method and laser welding technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of large welding deformation and welding stress, deterioration of joint performance, and influence of weld filling, etc., to achieve high precision and high Quality welding, low cost of technology transformation, and quick results

Pending Publication Date: 2021-12-10
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of welding heat input brought by high power and the increase of heat-affected zone will deteriorate the joint performance
At the same time, due to the low elastic modulus of titanium alloy, high-power welding will produce large welding deformation and welding stress, which will affect the filling of subsequent welds. The existence of stress will affect the quality of subsequent welding, and in severe cases, it will lead to welding cracks.
In addition, lath-shaped fillers need to be designed and prepared according to different material components, and there is no mature supporting industrial production system, which is not conducive to the large-scale engineering application of this technology

Method used

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  • Pre-filled wire laser ultra-narrow gap welding method for titanium alloy thick plate
  • Pre-filled wire laser ultra-narrow gap welding method for titanium alloy thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A laser ultra-narrow gap welding method for titanium alloy thick plate prefilled wire, which mainly includes the following steps:

[0040] S1. Two TC4 plates with a thickness h of 45mm are butted, using such as figure 1 In the thick plate narrow gap groove structure shown, the blunt edge thickness A is 10mm, the fillet diameter B is 3mm, TC3 welding wire with a diameter of 3mm is used as the filling material, and the groove angle C is 1°;

[0041] S2, welding

[0042] S21. Carry out blunt edge laser welding. The welding process used for blunt edge welding is: laser power is 10KW, defocus amount is +15mm, and welding speed is 1000mm / min; there is no need to put welding wire into the blunt edge, and there is no gap left for the blunt edge Assembly, using laser self-fluxing welding;

[0043] S22. When filling, use 6KW power, 1000mm / min welding speed, and defocus + 30mm for welding. For the first time, put two welding wires, and the welding wires are arranged longitudinal...

Embodiment 2

[0047] A laser ultra-narrow gap welding method for titanium alloy thick plate prefilled wire, which mainly includes the following steps:

[0048] S1. Two TC4 plates with a thickness h of 90mm are butted, using such as figure 2 In the narrow gap groove structure of the titanium alloy thick plate shown, the groove needs to be welded symmetrically, that is, the other side is welded after one side is welded, which is beneficial to reduce welding deformation. The blunt edge thickness A is 10mm, the fillet diameter B is 3mm, TC3 welding wire with a diameter of 3mm is used as the filling material, and the groove angle C is 1.5°;

[0049] S2, welding

[0050] S21. Perform blunt edge laser welding. The welding process used for blunt edge welding is: laser power is 10KW, welding speed is 1000mm / min, defocus + 15mm;

[0051] S22. When filling, use 10KW power, 1000mm / min welding speed, and defocus + 30mm for welding. Put three welding wires in a single time. The welding wires are arran...

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Abstract

The invention discloses a pre-filled wire laser ultra-narrow gap welding method for a titanium alloy thick plate. The welding method comprises the following steps of: processing a single-side or double-side groove of a titanium alloy thick plate to be welded into a U-shaped groove with a truncated edge, wherein the groove gap does not exceed 10 mm, the thickness of the truncated edge is 1-10 mm, the fillet diameter is 0-1 mm greater than the diameter of a pre-filled thick wire, and the groove angle is 0-1.5 degrees; then carrying out welding under gas protection, in the welding process, firstly carrying out truncated edge laser welding, and then carrying out filling welding after wire laying is conducted till filling welding is completed; and finally, carrying out capping laser welding. According to the welding method, the problems that the wire filling welding efficiency of the titanium alloy thick plate is relatively low, and the stability of a key hole is interfered by a wire in the welding process are solved, the welding efficiency is greatly improved, and the stability of the welding process is guaranteed; and meanwhile, the welding gap of the titanium alloy thick plate can be guaranteed to be within 10 mm, and welding deformation and welding stress are reduced to the minimum through layer-by-layer accurate energy control, so that high-precision and high-quality welding is achieved.

Description

technical field [0001] The invention relates to the technical field of laser ultra-narrow gap welding, in particular to a laser ultra-narrow gap welding method for titanium alloy thick plate prefilled wire. Background technique [0002] Narrow gap welding usually refers to the method of beveling a plate with a thickness of more than 30mm according to a gap smaller than the thickness of the plate, and then performing mechanized or automatic arc welding (when the plate thickness is less than 200mm, the gap is less than 20mm; when the plate thickness exceeds 200mm, the gap less than 30mm). Among them, the ultra-narrow gap groove width does not exceed 10mm. The gap used in the existing simple arc welding narrow gap welding is mostly 12-20mm, or even wider, and the welding speed is usually 0.12-0.2m / min. Although this narrow-gap welding technology has simple equipment and low cost, it needs to be further improved in terms of welding deformation and the structure and performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/12B23K26/60B23K26/70
CPCB23K26/21B23K26/123B23K26/60B23K26/70
Inventor 高福洋穆壮壮杨胜利马照伟
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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