The fatigue point of the construction scaffolding coupler caused the building to be overheated and the construction  scaffolding coupler gap was too large, resulting in the middle of the construction scaffolding coupler.

Fatigue damage, fatigue pitting or fatigue loss. Most of the damage is caused by overloading, excessive clearance of construction scaffolding coupler or rundown.

Slippery oil is not clean, internal mixed with foreign body. The chemical impurities in the lubricating oil oxidize the building buckle alloy. The corrosion of the structure of the construction scaffolding coupler is not pure, causing the parts of the building buckle to fall off. A small hole or pit of a rule.There are alloy corrosion, melting, fatigue point erosion, mechanical damage and cavitation.

In the form of several kinds of damage, the outer surface of the surface occurs plastic deformation and cold hardening, sliding  construction scaffolding coupler in the cylinder pressure impact load. After repeated action, the local deforming ability is gradually formed and expanded, and then as the grinding chips fall off, it is borne out。

The top layer forms a hole. When cavitation occurs in the general bearing, the pits first appear, then the pits gradually expand and cause the boundary of the alloy layer. The crack in the surface extends along the parallel direction of the interface until it is peeled off. In severe cases, metal is exposed to appearance. Dissection and large area of scratches.