What to do if the welding rod or nut is loose, making abnormal noises, or repeatedly coming loose?

Welding Rod  / Nut: Looseness, Abnormal Noise, Repeated Loosening

**Symptoms**
Nuts loosen after a period of operation.
The bracket emits a “clicking” or “rattling” noise during windy weather.
The welding rod or connecting components can be shaken by hand.

Possible Causes:

Flat washers and spring washers were not used in accordance with specifications; alternatively, the spring washer failed, or the flat washer was omitted during installation.
Only a single nut was used, with no anti-loosening measures applied.
The tightening torque was insufficient—merely “hand-tight”—and failed to reach the specified design torque.
The mounting bracket was installed out of level, subjecting the lead screw to prolonged alternating shear forces and lateral swaying forces.
The clearance in the screw thread engagement is excessive, or the precision of the nut/lead screw fails to meet standards.
Frequent thermal expansion and contraction cycles have caused the nut to loosen spontaneously.

Troubleshooting and Remediation

Component Inspection: Ensure all necessary accessories—specifically flat washers and spring washers—are present; for load-bearing joints, switch to a double-nut locking configuration.
Retighten fasteners using a torque wrench to the specified standard torque; tightening by feel alone is strictly prohibited.
Inspect support columns and main beams for any signs of deformation or misalignment; realign them to ensure proper horizontal and vertical orientation.
Apply thread-locking fluid (threadlocker) to critical load-bearing screws to prevent loosening.
Replace any substandard or mismatched nuts and screws with components of the appropriate standard and precision; mixing standard parts of different specifications is strictly prohibited.