Views: 57 Author: Site Editor Publish Time: 10-01-2021 Origin: Site
The scope of application of laser welding machine is more and more extensive, but the requirements are also getting higher and higher. It is necessary to blow air during the welding process to ensure that the product welding effect is beautiful and white. In laser welding, shielding gas will affect weld formation, weld quality, weld penetration depth and penetration width, etc. In most cases, blowing shielding gas will have a beneficial effect on the weld, but it is not used properly. Good may also bring unfavorable effects. So how to use air blowing correctly in the metal laser welding process? Let’s share with you Leapion laser below:
The commonly used shielding gases during the use of laser welding machines are: nitrogen N2, argon Ar, and helium He.
1. The correct blowing of shielding gas will effectively protect the weld pool to reduce or even avoid oxidation;
2. The correct blowing of shielding gas can effectively reduce the spatter generated during the welding process;
3. The correct blowing of shielding gas can promote the uniform spread of the weld pool during solidification, so that the weld is formed uniformly and beautifully;
4. The correct blowing of shielding gas can effectively reduce the shielding effect of the metal vapor plume or plasma cloud on the laser, and increase the effective utilization rate of the laser;
5. The correct blowing of shielding gas can effectively reduce the welding seam porosity.
1. Incorrect blowing of shielding gas may cause the weld to deteriorate;
2. Selecting the wrong gas type may cause cracks in the weld, and may also reduce the mechanical properties of the weld;
3. Choosing the wrong gas flow rate may cause more serious oxidation of the weld (whether the flow is too large or too small), and may also cause the weld pool metal to be seriously interfered by external forces and cause the weld to collapse or unevenly form;
4. Choosing the wrong gas blowing method will cause the welding seam to fail to achieve the protective effect or even basically no protective effect or have a negative impact on the welding seam formation;
5. Blowing in shielding gas will have a certain impact on the weld penetration, especially when welding thin plates, it will reduce the weld penetration.
Auxiliary blowing is an indispensable process in laser welding machine. On the one hand, it is to prevent the metal material from sputtering and contaminate the focusing lens (coaxial shielding gas); on the other hand, it is to prevent the high temperature plasma generated during the welding process from accumulating too much to prevent the laser from reaching the surface of the material (side blowing). The type of auxiliary gas and the amount of blowing gas have a greater impact on the welding results, and different blowing methods will also have a certain impact on the welding quality.
1. Coaxial shielding gas
2. Blow protective gas on the side of the side shaft
3. Selection principle of shielding gas blowing method: It is better to use a side axis for straight welds, and a coaxial for flat closed graphics.
How to choose the two blowing methods is a comprehensive consideration from many aspects. Generally, it is recommended to use side blowing protective gas.
Sideshaft side blowing For engineering applications, not all products can use sideshaft side blowing shielding gas. For some specific products, only coaxial shielding gas can be used, which needs to be carried out from the product structure and joint form. Choose in a targeted manner.
The selection of shielding gas directly affects the quality, efficiency and cost of welding production, but due to the diversity of welding materials, in the actual welding process, the selection of welding gas is also more complicated. It is necessary to comprehensively consider the welding material, welding method, and welding position. As well as the required welding effect, a more suitable welding gas can be selected through the welding test to achieve better welding results.
If you want to know more about professional questions about laser welding machines, please contact Leapion Laser directly.
