How to Control Heat Input in Wire Laser Welding?

When performing wire laser welding, controlling heat input is a key factor in ensuring weld quality, strength, and avoiding material deformation. Too much heat input may result in a weakened weld and material deformation, while insufficient heat input may result in a weakened weld. The following are some ways to control heat input in laser welding.

1. Adjust Laser Parameters

Laser power: Properly reducing the output power of the laser is a direct way to adjust the heat input. The higher the power, the more heat the weld generates.
Laser pulse width: If pulsed laser welding is used, the heat generated by each pulse can be controlled by adjusting the pulse width. Shorter pulse widths reduce heat input.
Welding speed: Increasing the welding speed can significantly reduce the heat input. Increasing the welding speed will reduce the size of the molten pool and the heat-affected zone, thereby reducing the heat input.

2. Control Welding Gas Flow

Gas protection: Using the right shielding gas can help cool the welding area and reduce heat input in wire laser welding. At the same time, the right gas type and flow source can effectively clean the surface and reduce the generation of harmful gases.
Adjust gas flow: If the gas flow is too large, it may increase the cooling rate and reduce heat input. It needs to be adjusted according to the welding material and welding position.

3. Optimize Welding Process

Welding sequence: A reasonable welding sequence can avoid heat accumulation. For example, alternating welding can disperse heat input and reduce material deformation.
Transition welding: For welding of connecting parts, gradual heating can be used, preheating first, then main welding, to control the rapid change of heat input.

4. Use Auxiliary Equipment

Cooling system: Use cooling devices (such as water cooling or air cooling) during welding to maintain the appropriate temperature of the welded parts and prevent overheating input.
Laser scanning system: Using laser scanning technology, multi-point welding can be performed, thereby reducing the heat input at each point.

5. Material and Fixture Design

Choose appropriate materials: Different materials (such as aluminum, steel, titanium, etc.) have different thermal conductivity coefficients. Appropriate materials and thicknesses should be selected to match the heat input requirements of wire laser welding.
Fixture design: Reasonably design the fixture to ensure that the welded parts do not deform during welding and reduce the risk of stress concentration caused by thermal stress.

6. Monitoring and Feedback

Online monitoring: Use thermal imagers and online sensors to monitor temperature changes during welding, adjust welding parameters in time, and control heat input.
Feedback control system: Realize automatic feedback control and automatically adjust laser power and welding speed according to the monitored temperature.

7. Data Recording and Analysis

Record the parameters during welding, collect and analyze data information for optimization in subsequent operations.

Summary

Through these methods, welding engineers can effectively control the heat input during wire laser welding, improve weld quality, and extend the service life of the welded joint. The key to controlling heat input lies in careful process adjustment and monitoring to ensure the optimal state of the welding process.

If you have related needs, please contact us immediately and we will provide you with the best offer!