Post-welding protection dragging cover for titanium alloy laser-MIC composite welding and welding method

A welding method and a technology of a protective cover, which are applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of poor thermal conductivity, inapplicability, and high production cost, and achieve the increase of protection time, prevention of air entrapment, and protection of area Increased effect

Inactive Publication Date: 2017-04-05
NANJING BAOSE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor thermal conductivity of titanium alloys and zirconium alloys, at the same time, the weld seam is easy to absorb hydrogen and oxygen above 300 °C, and high-temperature oxidation leads to defects such as pores, undercuts, and depressions in the weld seam, and the shape and performance of the weld seam are poor. It affects the production efficiency of enterprises and becomes a difficult problem restricting the application of laser-MIG hybrid welding
At present, some laser-MIG composite welding protective drag covers are too complex in structure, large in size, high in production cost, and not suitable for many occasions.

Method used

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  • Post-welding protection dragging cover for titanium alloy laser-MIC composite welding and welding method
  • Post-welding protection dragging cover for titanium alloy laser-MIC composite welding and welding method
  • Post-welding protection dragging cover for titanium alloy laser-MIC composite welding and welding method

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Experimental program
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Effect test

Embodiment 1

[0029] Such as Figure 1 to Figure 4 As shown, a protective drag cover for titanium alloy laser-MIG composite welding after welding, including a fixed connector 14, a connecting cross bar 4, a shell protective cover 8, an air pipe 5, a pneumatic quick-insert air pipe joint 12, and a copper mesh 10. The fixed connector 14 is fixed on one side of the MIG welding torch, the connecting bar 4 connects the fixed connecting member 14 and the housing protective cover 8, and the connecting bar 4 is provided with a scale, and the housing protective cover 8 Close to the lower end of the MIG welding torch, the ventilation pipe 5 is a stainless steel pipe with a row of regular small round holes on the two pipe walls and closed at one end. The closed surface of the body, the copper mesh 10 is embedded in the housing protective cover through the elastic clip 9 and the arc-shaped rectangular sleeve 11, the pneumatic quick-insert air pipe joint 12 is connected to the air intake end of the air ...

Embodiment 2

[0039] As the preferred technical solution of the present invention, according to the adjustment of welding parameters of laser-MIG hybrid welding of titanium plates, taking TA2 industrial pure titanium with a size of 120mm×60mm×3mm as an example, the parameters are welded according to the following process parameters , the laser output power is 2000W, the welding speed is 1.2m / min, the defocus is -2mm, the welding current is 100A, the distance between the light wires is 3mm, the elongation of the welding wire is 13mm, and the protective gas flow rate of the MIG welding torch is 15L / min, the back shielding gas flow rate is 50L / min, the protective gas flow rate of the shell protective cover after laser-MIG hybrid welding is 50L / min, after the welding is completed, the shell protective cover stays for 30s after laser-MIG welding for continuous protection seam. The welded seam welded with the process parameters of this embodiment has a completely penetrated back side, and the sh...

Embodiment 3

[0041] As the preferred technical solution of the present invention, according to the adjustment of welding parameters of titanium plate laser-MIG hybrid welding, taking TA2 industrial pure titanium with a size of 120mm×60mm×4.2mm as an example, the parameters are set according to the following process parameters For welding, the laser output power is 3750W, the welding speed is 1.2m / min, the defocus is 0mm, the welding current is 100A, the distance between the light wires is 2mm, the elongation of the welding wire is 13mm, and the protective gas flow rate of the MIG welding torch is 15L / min, the back shielding gas flow rate is 50L / min, and the protective gas flow rate of the shell protective cover after laser-MIG hybrid welding is 50L / min. welds. The welding seam welded with the process parameters of this embodiment has a beautiful front shape, a silvery white surface, and no spatter.

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Abstract

The invention discloses a post-welding protection dragging cover for titanium alloy laser-MIC composite welding. The post-welding protection dragging cover comprises a shell protection cover, the top of the shell protection cover is hinged to a connecting transverse rod, the connecting transverse rod is provided with a fixing connecting piece for fixation of an MIG-welding welding gun, a copper mesh is installed at the bottom of the shell protection cover, a breather pipe is installed at the tail portion of the shell protection cover and is connected with a pneumatic quick-insertion air pipe connector, and an inclined arc face for installation of the MIG-welding welding gun is arranged at the front end of the shell protection cover. By means of the post-welding protection dragging cover for titanium alloy laser-MIC composite welding and a welding method, protection gas of a welding seam can be stable in flow, the protection area is increased, and the protection time is prolonged; and in addition, the welding seam is in the continuous protection state after welding, and the possibility of contact between the post-welding welding seam and air is greatly reduced.

Description

technical field [0001] The invention relates to a protective drag cover and a welding method used for titanium alloy laser-MIG composite welding, and belongs to the field of welding. Background technique [0002] Laser welding concentrates high-density energy on a small point, so that the heat input into the melting zone and the heat-affected zone can be minimized, and the welding speed is much faster than TIG and MIG welding, which shortens the processing time and has little deformation , eliminating the need for secondary processing. Compared with pure laser welding, laser-MIG hybrid welding uses laser beam and electric arc to work together, the welding process is stable, the thermal efficiency is high, and it allows a larger welding assembly gap. However, due to the poor thermal conductivity of titanium alloys and zirconium alloys, at the same time, the weld seam is easy to absorb hydrogen and oxygen above 300 °C, and high-temperature oxidation leads to defects such as p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00B23K28/02B23K103/14
CPCB23K37/00B23K28/02B23K2103/14
Inventor 李瑞峰叶昕宁杜永勤祝晓辉张峰
Owner NANJING BAOSE
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