There are many types of laser spots suitable for laser cladding. The typical ones are Gaussian-distributed circles, evenly-distributed circles, and lines. Each spot has its own characteristics, each with its own advantages and limitations. Therefore, many laser cladding equipment will be equipped with two or even three-spot laser heads to meet the cladding requirements of various components. This article is to share with you the power of linear flare.

First, linear light spot cladding equipment

1. Integration of fiber-coupled semiconductor laser linear spot moving cladding equipment

Equipment integration features: drawer semiconductor laser + mobile vehicle + linear light spot + flexible six-axis manipulator

Advantages: strong maneuverability, flexible and versatile, strong adaptability to parts, and high linear beam spot cladding efficiency.

Applicable to: large, long axis, irregularly shaped large parts, on-site laser cladding, vertical and horizontal cladding.

2.Fiber laser linear spot cladding equipment integration

Equipment integration features: fiber laser + truss movement mechanism + linear spot module + high-precision turntable.

Advantages: fast clamping, efficient cladding, high precision and high stability.

Applicable to: rotating parts and flat parts such as columns, rolls, looper rolls, valve stems, petroleum drill stems, axles, wheels, etc.

3.Laser head and shaping module

The optical fiber coupling output spot is generally circular. After collimating and focusing the lens in the laser cladding head, the final spot shape is also round. In order to improve the efficiency of laser cladding and heat treatment on the surface of large-area workpieces, Huirui independently developed a shaping module that can be installed in front of the laser cladding head focusing module, so that the circular light spot becomes a rectangular light spot. After focusing, it cooperates with the linear cladding nozzle to form a highly efficient linear cladding, thereby improving the cladding efficiency. This cladding head is also very suitable for heat treatment such as laser quenching.

The cladding power can use 4-6kW. When the laser power is less than 4kW, it is recommended to output a rectangular spot with a spot size of 8 × 2mm. If the deformation is controllable, high power and high speed and a large amount of powder can be used to improve efficiency. The rectangular spot output is recommended to be 12 × 2mm. Taking into account a larger range of power, the scope of application is wider.

4.Linear nozzle

Hui Rui's independent research and development has good powder focusing, adjustable working distance, fast heat dissipation, and many types of models, suitable for high power laser cladding.

Application examples of linear spot laser cladding technology

Hui Rui independently developed nozzles, laser cladding hydraulic columns

Third, the linear spot laser cladding performance

1.Dense metallographic structure

Fe-S20 (1) material cladding layer

2.Good metallurgical bonding

Interface of Huirui Fe-S20 and 20 # steel

Fe-S20 is used for cladding on the surface of 20 steel. The hardness of the cladding layer is maintained at HV692.6 (HRC60.2). The metallurgical combination has a smaller penetration depth and a lower dilution rate. And other defects.

3.Medium carbon steel laser quenching

Microstructure changes to ultra-fine lath martensite after laser quenching

Medium carbon steel is quenched with a linear light spot. After quenching, the hardness is HV886 (HRC66.6). The average hardness is 0.5V depth (HV808 (64.5HRC)). Within 1mm depth, the hardness gradually decreases as the depth increases.

Fourth, linear spot laser cladding efficiency

In laser cladding, the energy of the circular spot is relatively concentrated, and the scanning linear velocity can reach a linear velocity of 50 mm / s or even higher, but the single lane width is small. The linear velocity of the corresponding linear nozzle can reach about 30, but the width of a single track is 10mm, especially for a linear spot of 3 × 12mm, and the track width can be 15mm. Compared to a circular spot, the metal powder deposition efficiency is increased by 3 to 5 times.