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Titanium alloy laser welding protection method

A laser welding and titanium alloy technology, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of unfavorable laser penetration welding and high cost

Inactive Publication Date: 2017-08-22
GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention patent application with the publication number CN106425090A discloses a side-blowing gas protection method for laser welding multi-tube L-shaped pipes. Although this method can protect the molten pool and the solidified weld seam at the same time, if the protective gas Helium, its cost is high, if argon is used as the protective gas, when protecting the molten pool, argon is easy to ionize to form metal plasma, which has a shielding effect on the laser, which is not conducive to laser penetration welding

Method used

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  • Titanium alloy laser welding protection method
  • Titanium alloy laser welding protection method
  • Titanium alloy laser welding protection method

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Experimental program
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Effect test

Embodiment 1

[0027] Under the designed welding protection system, the 2.5mm thick BT20 alloy is laser welded, the welding speed is 18m / h, the defocus is -1mm, and the laser power is 1.0kW. like figure 2 As shown, the appearance of the upper surface of the weld of 2.5mm thick BT20 alloy is easy to see from its surface color and state, even if the weld width is large (weld shape coefficient K=2~3), it will not be on the weld surface. Oxides and nitrides are formed.

Embodiment 2

[0029] Under the designed welding protection system, the 6mm thick BT6 alloy is laser welded, the welding speed is 36m / h, the defocus is -2mm, and the laser power is 5 kW (weld shape coefficient K≈1.3). like image 3 As shown, it is the appearance of the upper surface of the BT6 alloy weld with a thickness of 6mm. The silver weld proves that the atmosphere does not enter the molten pool, and the gas protection effect is good. like Figure 4 As shown, it is a metallographic picture of a 6mm BT6 alloy butt joint. It can be seen that there are no metallurgical pores, indicating that the welding process is stable.

Embodiment 3

[0031] Under the designed welding protection system, the 4.6mm thick BT22 alloy and the 1.6mm BT22 alloy sample are welded, the welding speed is 60m / h, the defocus is -2mm, and the laser power is 3.0kW. like Figure 5 Shown is the appearance of the upper surface of the 4.6mm thick BT22 alloy and 1.6mm thick BT22 alloy butt joint laser welded by the protection system. The color and condition of the weld seam confirm that the protection method can be used to weld samples of different thicknesses within 3mm.

[0032] Table 1 Chemical composition used in titanium alloy test (mass ratio %)

[0033] NO Alloy grade C Fe Si Cr Mo V N Al Zr O H 1 ВТ6 <0.1

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Abstract

The invention discloses a titanium alloy laser welding protection method. The titanium alloy laser welding protection method is characterized in that two gas streams are adopted to protect the laser welding process; one gas stream is helium, helium is conveyed to a welding zone through a protection cover arranged at an acute angle to protect a molten pool, and helium flow quantity Q1 is 8 L / min to 16 L / min; the other gas stream is low-ionization energy argon, argon is conveyed to the tail of the molten pool and weld joints through a horizontally placed protection cover to cool metals, and argon flow quantity Q2 is 12 L / min to 20 L / min; and the two gas streams are mutually independent, and argon flow quantity Q2 is greater than helium flow quantity Q1. According to the titanium alloy laser welding protection method, the two different gas streams are adopted, so that effective gas protection can be provided for laser welding of titanium alloy parts, high-quality titanium alloy welded joints can be obtained, and laser welding of a titanium alloy plate with the thickness of 1 mm to 12 mm can be effectively protected.

Description

technical field [0001] The invention belongs to the technical field of material laser processing, and in particular relates to a titanium alloy laser welding protection method. Background technique [0002] Titanium alloy has excellent properties and has been widely used in the industrial field, especially in the aerospace field. With the expansion of the application range of titanium alloys, its own welding processing problems have become increasingly prominent. Due to the high activity of titanium element, it is easy to absorb hydrogen, oxygen and nitrogen during the welding process, resulting in a decrease in its plasticity. Therefore, in the laser welding process of titanium alloy, due to the fast welding speed, the temperature of the weld after solidification is still high, and it is necessary to protect the molten pool and the solidified weld at the same time. [0003] At present, there are two main methods of gas shielding for titanium alloy laser welding: one is we...

Claims

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Application Information

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IPC IPC(8): B23K26/12B23K26/26B23K103/14
CPCB23K26/123B23K26/26B23K2103/14
Inventor 哈斯金·弗拉基斯拉夫罗子艺陈永城郭瑞·弗拉基米尔伊戈尔·克里夫出韩善果弗拉基米尔·希达列茨蔡得涛高雯雯
Owner GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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