Handheld Fiber Laser Welding Machine

Welding Head Problem: no security ground lock signal

Feb 25, 2022

When the welding gun is in contact with the workpiece, the detection page [safety Ground lock signal] is displayed in gray

Cause Analysis:

When the welding gun is in contact with the workpiece, the 5/6 pins of the signal interface 1 should be in a conductive state. When there is an open circuit or an internal problem on the main board, it will be displayed in gray. The structure is as shown below.


The 5 feet is connected to the safety ground lock chuck, which is in contact with the workpiece

The 6 feet is connected to the welding torch head through a three-core wire


①At the same time, test whether the trigger signal is normal. In some cases, the aviation plug is loose, which will result in no two signals. The aviation plug is located 80cm behind the wire of the welding gun.

② Directly short-circuit the 5/6 pins of signal interface 1. If it can be connected, the main board is fine, and continue to the next step of inspection.

③Measure the on-off of the safety ground lock clip to 5 feet

③ Measure the on-off from the copper nozzle to the 6th pin. In some cases, the line is broken. You can use a multimeter to measure the on-off of the signal.

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