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Views: 108 Author: Site Editor Publish Time: 2022-10-19 Origin: Site
Hot-dip galvanized steel pipe production line process: feeding → pickling, water washing → solvent → drying → hot-dip galvanizing → inner and outer blowing → rolling labeling, marking → passivation → inspection → packaging. The loading worker should check the condition of the raw materials: the surface of the steel pipe must not be stuck with oil stains (especially oil stains such as asphalt oil blending paint), otherwise a large number of unqualified products will be formed.
The steel pipe must be straightened during production to eliminate the internal stress of the steel pipe. The surface of the steel pipe shows uneven corrosion and cannot be galvanized, otherwise a large amount of hydrochloric acid will be wasted. Tubes must not exhibit artificial bends during transportation. For hot-dip galvanized steel pipes, it is not allowed to stick markers on the inner and outer walls of the steel pipes to avoid leakage plating.
Pickling of hot-dip galvanizing, water washing, and pickling of steel pipes: pickling workers must wear labor and maintenance supplies before work, carefully check the work site for obstacles and whether the sling is intact, and stop work before confirming that they are in good condition. Pickling mainly adopts hydrochloric acid pickling, and water is used to prepare hydrochloric acid, and the content of hydrochloric acid is 18~20%.
The appearance of gaps refers to the phenomenon that the welds are not bonded together. The length of the gaps is generally more than a few centimeters or even longer. The main reasons are as follows:(1) Pass wearAs the extrusion roll hole pattern wears, the hole pattern (R) size gradually becomes l
Sand-hole pipes are also a kind of quality accident caused by weld leakage, but their gaps are very small, some of them cannot be directly observed by human eyes, and must be found through testing equipment, so we call this kind of pipes sand-hole pipes. The main reasons for sand hole pipes are as f
(1) The hole type does not matchThere are two-roller, three-roller and four-roller weld seam extrusion structures. As long as the combined hole shapes do not match, it is easy to cause scratches on the surface of the tube blank, especially the two-roller structure.There are many factors that cause t
