Nowadays,a tricky product named hot-dip galvanized fluid pipe (also called “de-galvanized seamless processed pipe”) is super common,It’s actually modified high-frequency welded pipe,Manufacturers simply grind or plane off the original weld seams and then re-galvanize the surface to fake a high-quality seamless pipe look,

Key Causes of Omission Plating in Galvanized Pipes: Grease on base pipe – prevents proper adhesion,leading to uneven coating and black marks,Surface corrosion – residual iron oxides block zinc contact,causing pitting,Heavy stains or grease – difficult to remove,resulting in localized omission plating with smoother edges,Scratches and rough surfaces – contaminants trapped in grooves,causing long,narrow defects (rare),Insufficient galvanizing temperature – leads to leakage issues in the finished pipe,

To ensure optimal welding quality,it is essential to remove the galvanized layer at the weld joint first,You can use a hand grinder,sandpaper,or gas welding flame for cleaning,Failure to do so may lead to bubbles,sand holes,incomplete welding,as well as brittleness and reduced rigidity of the weld seam,For galvanized steel pipes with a diameter exceeding 100mm,flanges or sleeve-type special pipe fittings should be adopted for connection,The welding joint between the galvanized steel pipe and the flange must be galvanized for the second time to ensure corrosion resistance,

Galvanized welded pipes are widely used in construction,transportation,and agriculture,but their zinc coating often wears down quickly under abrasive conditions,This article explores practical methods to enhance their durability,focusing on coating upgrades and base material improvements,

Galvanized welded steel pipes for low-pressure fluid transportation (GB,T3091-1993),also known as galvanized welded steel pipes,commonly known as white pipes,It is a hot-dip galvanized welded (furnace welding or electric welding) steel pipe used for transporting water,gas,air oil,heating steam,warm water and other generally low-pressure fluids or other purposes,The wall thickness of steel pipes is divided into ordinary galvanized steel pipes and thickened galvanized steel pipes; The types of takeover ends are divided into non threaded galvanized steel pipes and threaded galvanized steel pipes,