Core Manufacturing Technology The core manufacturing technologies for casing and tubing are as follows:
1, chemical elements
Due to demanding environmental services, coiled tubing requires high mechanical and corrosion resistance. In order to optimize the chemical composition design of the material, cleanliness control over the entire process, such as smelting and rolling, must also be implemented to minimize inclusions and S, P, etc. Harmful elements.
2, processing
As a result of dislocation proliferation and other causes of sclerosis and Bauschinger effect together, the transformation tube body strength control.
3, heat treatment
Through the tube heat treatment for the best organization and performance control, especially high strength, high toughness and low residual stress.
4, welding technology
Low-carbon and low-alloy steels are currently mainly used HFW welding technology, the need to study the best welding parameters (such as current, voltage, frequency, welding speed, forming angle, the amount of reduction, etc.), and weld heat treatment technology .
5, docking
To achieve continuous production of high-frequency welded pipe, it must first long board, the current piece of the docking of the main TIG welding, MAG and plasma welding. The research method is friction stir welding.
6, pipe docking
Coiled tubing may cause localized damage during use, damaged or defective parts must be severed, and the tubing should be connected by welding. The traditional dock docking method using manual TIG welding, welding quality is difficult to control, so that the current automatic welding technology.
7, new manufacturing technology
As a CVR technology, an in-line induction heated to 940 ° C continuous tube by thermo-mechanical rolling is used in the same size tube to achieve seamless or HFW welding optimization. On the one hand, variable wall thickness or other aspects of adjustment are achieved. In addition, there are special stainless steel continuous laser welding technology.
