When the joint of Fuyang stainless steel pressure gauge, if the joint is picked, the coolant used is different, such as oleic acid, oleic acid will stick to the surface of the stainless steel joint, especially on the surface of the thread buckle, if it is clear and not clean, a long time will leave and form rust marks.

After welding the joint or spring tube of the stainless steel pressure gauge, it must go through several processes such as annealing, overpressure aging and cleaning. If the joint and nut are twisted in the overpressure aging process, rust or other corrosion is pasted on it; If the cleaning is not clean during the cleaning process, the joint will leave and form rust marks for a long time.

The chemical composition of the joint material of the stainless steel pressure gauge is unqualified, the content of some elements is too high, and the content of some elements (such as chromium, nickel, molybdenum) is too low, which is also the reason why the joint will rust, and the surface of the joint is easy to produce rust.

There are small bumps in the welding, which need to be polished with a steel wheel. Domestic steel wheel, the actual steel wire is carbon steel wire or wire, in the polishing process, carbon steel wire or wire end may adhere to the surface of the joint, under certain temperature and humidity conditions, the surface of the joint may form rust marks.

When the joint of the stainless steel pressure gauge is cast with sand mold, if the sand on the surface of the casting is not clean, in the future storage and transportation process, contact with water or moisture may cause corrosion.