The handheld laser welding system shows that it cannot connect properly and does not emit light for welding

When using handheld laser welding systems RDWelder-SW and RDWelderDW-V2Pro, if the display shows that the connection cannot be made properly and the welding does not produce light, you can follow the following steps to troubleshoot:

Troubleshoot the Core Control System Version and Communication Link 

This symptom directly points to an interruption in internal system communication.

1. Check Compatibility Between Board and HMI Panel Versions: This is the primary checkpoint. The software (firmware) versions of the system's mainboard (control board) and the handheld operation panel (HMI) must be strictly compatible. Version mismatches can cause communication protocol recognition failures, triggering connection errors. Refer to the device technical manual to verify and confirm that the board firmware version and the HMI panel software version are fully compatible. If necessary, contact the equipment supplier to obtain and flash the correct matching versions.

2. Check Physical Wiring of the HMI Panel: After confirming version compatibility, inspect the connection cables. Turn off the main power to the device and carefully inspect all data and power cables connecting the main control cabinet to the HMI panel on the handheld welding gun. Ensure plugs are firmly seated in their ports, checking for looseness or poor contact; inspect the cables themselves for visible wear, crushing, or breaks. Reconnect all relevant interfaces (ensuring power is off) to rule out poor connections.

Troubleshoot the Laser Generation and Transmission Path

While addressing or confirming the control connection issue, simultaneously or subsequently troubleshoot the laser output problem. Even if the connection is restored, optical path issues can prevent laser output.
1. Inspect the Condition of the Gun Head Focusing Lens: The focusing lens is the critical optical component that finally concentrates the laser beam onto the workpiece. Open the welding gun head protective cover and visually inspect the focusing lens. Check the lens surface for obvious cracks, chips, or signs of coating ablation. Any physical damage will prevent effective laser focusing or may cause the lens itself to fail, requiring immediate replacement.

2. Check the Cleanliness of the Protective Lens: The protective lens is located in front of the focusing lens and shields it from welding spatter. Check if the surface of this lens is contaminated with excessive metal spatter particles, smoke residue, or oil. Severely soiled lenses can significantly attenuate laser energy and may even cause the lens to overheat and crack. Clean or replace the protective lens regularly according to the established procedures.

3. Check the Alignment Laser and Related Parameters:
Alignment Laser Output Check: Most systems are equipped with a coaxial alignment (pilot) laser, used to preview the laser path and focal point position. First, try activating the alignment laser in manual mode. Observe whether a red beam is emitted from the gun head. If the alignment laser also fails to emit, the alignment light source may be damaged or there could be a related control circuit fault, requiring further inspection.
Verify Alignment Laser Offset Parameters: If the alignment laser emits normally but the welding laser does not, focus on checking the "alignment laser offset" or "laser calibration" parameters. These parameters ensure the alignment laser beam is perfectly coaxial with the invisible industrial laser beam. Incorrect parameter settings can cause the alignment laser to indicate a position different from the actual laser interaction point. Refer to the equipment calibration manual and use dedicated calibration tools (e.g., thermal paper, calibration target) to realign the concentricity of the alignment and welding lasers, ensuring the relevant parameters are correctly saved to the system.