1 Judging from the surface, that is, in visual inspection. The visual inspection of welded joints is a simple procedure with a wide variety of inspection methods. It is an important part of finished product inspection, mainly to find welding surface defects and dimensional deviations. Generally, the

1. Welding processIn the welding process, the welding method of the spiral steel pipe and the longitudinal welded pipe is the same, but the longitudinal welded pipe inevitably has many T-shaped welds, so the probability of welding defects is greatly increased, and the welding residual stress at the

Stainless steel pipe fittings are a kind of pipe fittings. They are made of stainless steel materials, so they are called stainless steel pipe fittings. They include stainless steel elbows, stainless steel tees, stainless steel crosses, stainless steel reducers, stainless steel pipe caps, etc., acco

The appearance of the spiral steel pipe is not treated, which is beneficial to improve its service life.1. Use a wire brush, sandpaper, and other tools to polish the surface of the anticorrosive spiral pipe, which can remove loose oxide scale, rust, welding slag, etc.2. Use solvents and emulsions to

1. Longer life, ordinary steel pipes have a certain lifespan. When ordinary materials are treated with anticorrosion, their lifespan can be as long as 20-30 years or longer. It can be described as the "lifetime star" in the pipeline, and it can be saved in use. It saves replacement, maintenance and

316L stainless steel pipe is a kind of pipe widely used in construction engineering. The shape of the tube is an oblong hollow steel tube. Mechanical equipment, petrochemical equipment, medical equipment, food, and light industry pipelines or mechanical parts will all use 316L stainless steel pipes.

The main purposeGalvanized pipes are usually used to loosen gas and heating. Galvanized pipes are also used as water pipes. However, after a few years of use, a large amount of rust will be generated. The yellow water that flows out will not only contaminate sanitary ware but also breed bacteria on

It is recommended to use polyethylene anti-corrosion adhesive tape with a special primer for external anti-corrosion of the pipeline. This anti-corrosion process does not require high requirements on the construction site and is pollution-free. It can be prefabricated for corrosion protection, and t

The API standard stipulates that the internal and external surfaces of import and export petroleum casings shall not have folds, separations, cracks, and scars. These defects should be completely removed, and the removal depth should not be less than 12.5% of the nominal wall thickness. Petroleum ca

1. Manufacturing and processing methods of seamless steel pipes:(1) Hot rolling (extruded seamless steel tube): round tube billet→heating and piercing→three-roll cross-rolling, continuous rolling or extrusion and one-off tube→sizing (or reducing)→cooling→straightening→hydraulic pressure Test (or fla