How to avoid cracks in laser cladding

1、 Material selection
The material melted by laser should have a high melting point and thermal conductivity in order to better withstand the heat of the laser beam. Meanwhile, the chemical composition and crystal structure of the material can also affect the formation of cracks. Therefore, when selecting materials, these factors should be considered, and materials with good melting performance and crack resistance should be chosen.

2、 Control parameters
The parameters of laser cladding include laser power, scanning speed, laser beam diameter, etc. The selection of these parameters directly affects the properties of the cladding layer and the generation of cracks. Usually, high-power, low-speed, and large-diameter laser beams are prone to cracking. Therefore, during the melting process, parameters should be adjusted reasonably to reduce the occurrence of cracks.

3、 Post processing
After laser cladding, post-treatment of the material is required to eliminate cracks and improve performance. Common post-processing methods include heat treatment, pressure treatment, and chemical treatment. Among them, heat treatment can improve the strength and toughness of materials, pressure treatment can eliminate cracks and improve surface quality, and chemical treatment can improve the chemical and surface properties of materials.

In summary, avoiding cracks in laser cladding requires selecting appropriate materials, controlling cladding parameters, and conducting effective post-processing. These methods can effectively improve the performance and quality of the cladding layer, providing more efficient and reliable surface treatment technologies for industrial production.