Laser auxiliary activity welding method

A welding method and laser-assisted technology, used in laser welding equipment, welding equipment, arc welding equipment, etc., can solve the problems of complex welding process, affecting the corrosion resistance of the weld, and slag on the surface of the weld.

Inactive Publication Date: 2008-09-03
LANZHOU UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The above methods have the following disadvantages: there is slag on the surface of the weld obtained after using the active agent or mixed gas, and the surface shape becomes poor
The existence of slag often complicates the subsequent welding process, affects the performance of the weld, and even affects the corrosion resistance of the weld

Method used

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  • Laser auxiliary activity welding method
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The material used is SUS 304 stainless steel. Before welding, carefully clean the weld bead with sandpaper. First, use 50W CO 2 The laser beam melts the surface of the weldment under the protection of oxygen, increasing the oxygen content of the weld surface. In order to compare the change of penetration depth with and without low-power laser treatment, only half of the sample was melted, such as figure 1 shown. The process parameters of low-power laser melting are shown in Table 1. Then use conventional TIG welding to cover the low-power laser pretreatment area, and complete the welding of the low-power laser pretreatment area and the non-laser treatment area at one time. The welding parameters are shown in Table 2. The automatic argon arc welding device was used in the test, the argon arc welding torch was fixed, and the workpiece was placed on a horizontally movable work platform, so as to ensure that the arc length did not change during the welding process, thereb...

Embodiment 2

[0017] The material used in the test is SUS 304 stainless steel, the sample size is 200mm×80mm×8mm, and the weld bead is carefully cleaned with sandpaper before welding. The method of low-power laser treatment is identical with embodiment 1, adopts conventional CO 2 Laser welding covers the low-power laser pretreatment area, conventional CO 2 The parameters of laser welding are shown in Table 5.

[0018] Under the same laser welding specification, the penetration depth of the laser treatment area is increased by 1mm compared with the non-laser treatment area. Such as Image 6 , Figure 7 As shown, the weld width at the top of the weld in the laser treatment area is significantly smaller than that in the non-laser treatment area. Analyzing the oxygen content in the weld, the oxygen content of the weld without low-power laser treatment is 36ppm, and the oxygen content of the weld with low-power laser treatment is 98ppm, which is within the allowable use range of the material...

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Abstract

A laser-assisted active welding method, which aims to increase welding fusion depth in the absence of active agent, comprises the following steps: fusing the surface of welding beads to be welded by a laser beam under protection of oxygen; and welding the welding beads pre-processed by laser by common welding method. The selected laser beam is a small-power laser beam with a power range of 5 to 100 W. The welding bead fused by the laser has a fusion width less than or equal to 1 mm and a fusion width less than or equal to 2 mm.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method using laser beam processing. Background technique [0002] The active welding method was applied earlier in TIG welding, and the concept of A-TIG welding has been formed. The A-TIG (Activating flux TIG) welding method is to coat a thin layer of active agent on the surface of the welding plate, causing the welding arc to shrink or the flow state of the molten pool to change, which can increase the penetration depth by 1~ 2 times. Shanping Lu's research found that the use of mixed gas can also increase the penetration depth of TIG welding. The above method has the following disadvantages: slag exists on the surface of the weld seam obtained after using the active agent or the mixed gas, and the surface shape becomes poor. The existence of slag often complicates the subsequent welding process, affects the performance of the weld, and even affects the corrosion resistance of th...

Claims

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Application Information

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IPC IPC(8): B23K9/235B23K26/42B23K26/36B23K26/60
Inventor 张瑞华尹燕沈婕张鹏林
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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