We can judge whether there is an exposed eye by distinguishing the welding condition of the sealing screw. The reason why the sealing screw has the function of sealing water is the sealing piece in the middle. If the welded sealing piece is exposed, it will affect the waterproof effect in the later period.
It can also be distinguished by scientific methods to see whether the raw materials conform to the regulations, which is what we call the tension test report of the water stop screw. It is easy to distinguish whether the raw material of water stop screw is brand new Q235 wire or old material production.