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A double-beam welding method for titanium alloy T-joint based on preset powder technology
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A welding method and technology of titanium alloy, applied in laser welding equipment, welding equipment, welding medium and other directions, can solve the problems of complex process, inaccurate wire feeding, poor welding seam forming quality, etc., to simplify the wire feeding device, avoid feeding Filament stability and the effect of spatial position interference
Active Publication Date: 2020-02-11
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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Problems solved by technology
This double-beam wire-filling welding method has high efficiency and high utilization rate of welding wire, but the problems brought about by this method are: (1) The wire feeding device is installed at the front of the welding head and occupies a large amount of space. , especially in semi-closed structures such as cavity structures, it is difficult for the welding wire to reach the designated position, the wire feeding is inaccurate, and the quality of weld formation is poor
(2) Due to the limitation of synchronous wire feeding, remote welding cannot be realized, and the welding head can only be close to welding, and the welding nozzle is easy to ablate
(3) The amount of wire feeding during welding is not easy to be accurately compensated according to the fit gap or partial missing of the welding surface
This method has a complicated process. First, the square boss must be 3D printed separately on the vertical rib, and then welded.
It is not only time-consuming and labor-intensive to 3D print the boss on the vertical bar, but also easily lead to the deformation of the vertical bar
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Embodiment 1
[0033] In this embodiment, a 2.0mm thick TC4 titanium alloy plate is used as the skin bottom plate material, and a 1.5mm thick TC4 titanium alloy plate is used as the base material of the vertical bars, and the vertical bars are assembled on the skin to form a T-joint to be welded.
[0034] The first step is to select titanium alloy powder TC4 powder with the same chemical composition as the base metal, and the powder particle size is 500 mesh, and then mix TC4 powder, BaCl 2 , NaF 2 Mix according to the mass ratio of 1:0.02:0.02, the resulting mixture and alcohol are mixed evenly according to the ratio of 1:3, and the mixture settles at the bottom of the container for use.
[0035] In the second step, paint the alcohol mixture on both sides of the T-joint, such as figure 2 As shown, the coating thickness h is 0.1 mm, and the coating width K (k1, k2) is 0.5 mm.
[0036] In the third step, after the alcohol volatilizes, the coating layer is scanned with a defocused spot of l...
Embodiment 2
[0039] In this embodiment, a 3.0mm thick TC4 titanium alloy plate is used as the skin bottom plate material, and a 2.0mm thick TC4 titanium alloy plate is used as the base material of the vertical ribs, and the vertical ribs are assembled to the skin to form a T-shaped joint to be welded.
[0040] The first step is to select titanium alloy powder TC4 powder with the same chemical composition as the base metal, and the powder particle size is 500 mesh, and then mix TC4 powder, BaCl 2 , NaF 2 Mix according to the mass ratio of 1:0.02:0.02, the resulting mixture and alcohol are mixed evenly according to the ratio of 1:3, and the mixture settles at the bottom of the container for use.
[0041]In the second step, paint the alcohol mixture on both sides of the T-joint, such as figure 2 As shown, the coating thickness h is 2 mm, and the coating width K (k1, k2) is 2 mm.
[0042] In the third step, after the alcohol volatilizes, the coating layer is scanned with a defocused spot of...
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Abstract
The invention provides a titanium alloy T-shaped joint double-beam welding method based on a powder pre-preparing technology. The titanium alloy T-shaped joint double-beam welding method comprises thesteps that titanium alloy powder the same as a to-be-welded T-shaped joint in chemical component is selected, after being mixed with a small amount of BaCl2 and NaF2, a mixture is put into alcohol tobe evenly mixed and settled for standby application; an alcohol mixture is painted on the two sides of the to-be-welded T-shaped joint to form coating layers; and after the alcohol is volatilized, the T-shaped joint is subjected to laser welding. The powder laser pre-preparing technology is used, through methods the titanium alloy welding powder is coated on the connecting position of the T-shaped joint in advance and then subjected to laser welding, a laser welding head front end wire feeding device is greatly simplified, the problems of wire feeding stability of filler wire welding, spatialposition interference and the like are avoided, and the double-beam filler welding function of a large-curvature complex space can be achieved, so that double-beam remote welding becomes possible.
Description
technical field [0001] The invention relates to the technical field of laser processing, in particular to a double-beam welding method for titanium alloy T-shaped joints based on preset powder technology. Background technique [0002] Structural parts of wall panels are commonly used in aviation and aerospace engineering applications. Titanium alloy materials are widely used in thin-walled wall panel structures due to their excellent specific strength, specific stiffness, corrosion resistance and high impact toughness. The aerodynamic skin of aircraft such as airplanes and rockets. In recent years, the use of double-beam welding method to manufacture integral wall panels has been reported at home and abroad. The current design of the skin-type wall panel structure is generally two-way reinforced, such as a typical bridge-hole structure. The wire feeding device interference problem often occurs at the bridge hole when the double beam wire filler welding is welding the bulkhe...
Claims
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