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Resistance welding method
There are many types of electric resistance welding(erw), and there are three types of welding, seam welding, butt welding and projection welding. First, spot welding Spot welding is a method of electric resistance welding in which a weldment is assembled into a lap joint and pressed between two ...Read more -
Quality inspection method of spiral pipe
The quality inspection method of spiral pipe (ssaw) is as follows: 1. Judging from the surface, that is, in visual inspection. Visual inspection of welded joints is a simple procedure with various inspection methods and is an important part of finished product inspection, mainly to find welding...Read more -
Seamless tube eddy current flaw detection
Eddy current flaw detection is a flaw detection method that uses the principle of electromagnetic induction to detect surface defects of components and metal materials. The detection method is the detection coil and its classification and the structure of the detection coil. The advantages...Read more -
Corrosion in drilling pipe
What is the main difference between corrosion fatigue fracture and stress corrosion fracture of drill pipe? I. Crack initiation and expansion: Stress corrosion cracks and corrosion fatigue cracks are all sent to the surface of the material. Under strong corrosive media and large stress conditions...Read more -
Seamless steel pipe schedule
The steel pipe wall thickness series comes from the British metrology unit, and the score is used to express the size. The wall thickness of the seamless pipe is made up of the Schedule series (40, 60, 80, 120) and is connected to the weight series (STD, XS, XXS). These values are converted to mi...Read more -
Raw material and production process of steel
In daily life, people always refer to steel and iron together as “steel”. It can be seen that steel and iron should be a kind of substance; in fact, from a scientific point of view, steel and iron have a little Different, their main components are all iron, but the amount of carbon co...Read more