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Application Of Laser Cleaning In Post-weld Treatment
Aug 30, 2018

The welding process is a manufacturing process technology that joins metal or other thermoplastic materials in a heated manner. It is a commonly used material processing method in engineering, which can stably and effectively connect different workpieces.

After welding, the weld may have rough surrounding appearance, uneven structure, stress concentration, and welding defects such as pores and inclusions, resulting in deterioration of mechanical properties such as corrosion performance, fatigue performance and toughness, making the weld become a weak link of the whole workpiece. Therefore, the slag skin and spatter should be removed immediately after welding, and the surface of the weld be cleaned, which is beneficial to the observation and flaw detection of welding defects after welding, and the surface defects are found in time and eliminated and repaired to ensure product quality.

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Existing post-weld treatment methods and analysis

The existing post-weld surface treatment methods are mainly mechanical grinding and chemical cleaning.

Mechanical grinding is easy to cause damage to the workpiece, and it is difficult to cope with complicated surface processing, and the noise pollution is large and the work intensity of the worker is large.

Chemical cleaning is not suitable for local cleaning and is likely to cause environmental pollution.

In today's China's environmental protection regulations are becoming more stringent and people's awareness of environmental protection and safety is increasing. In order to meet the needs of the market, a post-weld surface treatment method with high efficiency, high quality, environmental protection and wide applicability is needed. Cleaning technology is an efficient and environmentally friendly technology that satisfies the above conditions to solve existing problems.

The laser cleaning technology uses a high-energy laser beam to illuminate the surface of the workpiece, so that the surface of the dirt, rust or coating is instantaneously evaporated or peeled off, and the surface adhering or surface coating of the cleaning object is quickly and efficiently removed, thereby achieving a clean process.

The laser cleaning technology not only can effectively clean the residual slag skin and spatter on the surface after welding, but also solve the problems existing in the existing post-weld surface treatment according to its own characteristics.

(1) The laser cleaning technology has no contact with the surface of the material, and has wide applicability for cleaning various shapes of components, which can solve the problem that mechanical cleaning is difficult to cope with complex surface processing.

(2) After cleaning the surface contaminants, the laser cleaning technology has no damage to the substrate or the product, and can solve the problem that the mechanical polishing is easy to damage the surface of the workpiece.

(3) The laser cleaning technology is highly efficient, energy-saving and environmentally friendly. It can be effectively solved in relation to the damage of the substrate, the size of the component, the long time efficiency, and the harmful effects of chemical reagents on the human body and the environment.

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