Laser Welding Positioning Method

1. Positioning Method for Laser Welding

Laser welding positioning is to ensure welding accuracy and quality and achieve good welding results. The positioning of laser welding can be divided into three steps: pre-positioning, real-time positioning and post-positioning. Pre-positioning is to measure and position the workpiece before welding to ensure that the position and angle of the workpiece are accurate. Real-time positioning refers to monitoring the position and angle of the welding point in real time through specific equipment and algorithms during the welding process, and adjusting them to achieve the optimal welding effect. Post-positioning refers to inspecting and fine-tuning the welds after the welding is completed.

2. Pre-positioning for Laser Welding

Pre-positioning of laser welding mainly includes four links: workpiece surface preparation, marking, measurement and positioning.

a. Workpiece surface preparation

The welding quality of laser welding is highly dependent on the surface quality of the workpiece, so the surface of the workpiece needs to be treated before laser welding to achieve the best welding quality. Specifically, the dirt, oxides and attachments on the surface of the workpiece need to be removed so that its surface finish meets the requirements of laser welding. The workpiece surface needs to be scored and marked for subsequent measurement and positioning.

b. Mark

Marking refers to printing notches or marks that meet specific standards on the surface of the workpiece to facilitate subsequent measurement and positioning. There are various ways of marking, and a special marking machine or laser marking machine can be used for marking. Generally, the marking is required to be clear, obvious, and not easy to be worn or peeled off.

c. Measurement

The measurement of laser welding mainly determines the position and angle of the workpiece before welding by measuring the coordinates of the mark points on the surface of the workpiece and the surface shape and position information. Different processes and equipment require different measurement accuracy, and some high-precision laser welding equipment can achieve micron-level measurement accuracy. The measurement method can be manual measurement or automatic measurement, and pre-calibration is performed based on the measurement results.

d. Positioning

Positioning refers to determining the position, angle and attitude of the workpiece before welding based on the measurement results to determine the starting point and direction of the welding. It can also be used to correct the slight position of the workpiece. The positioning method can be manual adjustment or automatic equipment control.

3. Real-time Positioning of Laser Welding

The real-time positioning of laser welding is mainly achieved through the sensors and algorithms that come with the laser welding equipment. These sensors can monitor various parameters such as the position of the welding point, temperature, pressure, power, etc. These parameters can also be compared with the predicted data, and the welding parameters or positioning can be adjusted and optimized based on the comparison results to ensure the stability and reliability of the welding results.

4. Post-positioning of Laser Welding

The later positioning of laser welding is mainly carried out by checking the size of the metal and the shape of the weld. Specifically, the workpiece is placed on the measuring instrument more accurately, and parameters such as the length, width, height and key positions of the weld are measured, such as the position of the weld, the depth of the weld, etc. If the measurement results do not match the expected results, appropriate adjustments and repairs are required to ensure the quality and reliability of the welding. This process can be carried out manually or with the help of automated measurement and control systems.

5. Summary

The positioning method of laser welding is an important step to ensure welding accuracy and quality. Pre-positioning is mainly achieved through the four steps of preparation, marking, measurement and positioning of the workpiece surface. Real-time positioning is mainly achieved by using sensors and algorithms. Post-positioning is mainly performed by measuring the size and shape of the weld. Different equipment and processes require different positioning accuracy and stability, which need to be selected and adjusted according to the actual situation.