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Basic requirements for the appearance of welds of straight seam steel pipes
1. The surface of the welding joint: A. Cracks, lack of fusion, pores, slag inclusion, and splashes are not allowed. B. The weld surface of pipes whose design temperature is lower than -29 degrees, stainless steel and alloy steel pipes with a greater tendency to hardening shall not have undercut....Read more -
Analysis of the difference between seam stainless steel pipe and seamless stainless steel pipe
4. Pipe strength The strength of the pipeline depends on the alloy composition, so the seamless stainless steel pipe and the seamed stainless steel pipe containing the same alloy and the same heat treatment are essentially the same in strength. After the tensile test and three-dimensional vibrati...Read more -
Eight characteristics of 3PE anti corrosive steel pipe
1. The polyethylene material used in 3pe steel pipes makes the pipes have a long service life, large molecular weight, good stability, and aging resistance. Under normal working temperature and pressure, the service life can be guaranteed for more than 50 years. 2. The corrosion-resistant polyeth...Read more -
The purpose of preheating the pipe before welding the spiral steel pipe
The purpose of preheating before welding is as follows: (1) Preheating can slow down the cooling rate after welding, allowing hydrogen to diffuse and escape in the weld metal, thus avoiding cracking caused by hydrogen. It can also reduce the degree of hardening of welds and heat-affected zones to...Read more -
Anti-corrosion countermeasures of oil casing
1. To make sure that the water quality meets the standards, and strictly monitor and manage the water quality. Implement cleaning and separate injection, strengthen the cleaning of main water pipelines, ensure that the water quality in the station and the bottom of the well meets the standard, an...Read more -
Stainless steel pipe welding process method A
High-frequency induction welding In high-frequency contact welding and high-frequency induction welding, the equipment that provides current and the equipment that provides squeezing force are independent of each other. In addition, both methods can use a magnetic rod, which is a soft magnetic el...Read more -
Production process of spiral steel pipe
(1) Raw materials are strip steel coils, welding wires, and fluxes. Strict physical and chemical tests are required before investment. (2) Butt joint of strip steel head and tail, adopt single wire or double wire submerged arc welding, after coiling into steel pipe, adopt automatic submerged arc ...Read more -
Hot rolling process in stainless steel pipe fittings
Simply put, the process of rolling steel material after heating it to a temperature above the recrystallization temperature is called hot rolling. And below the recrystallization temperature, the process including rolling at room temperature is known as cold rolling. Hot rolled steel has good pla...Read more -
Introduction to water supply steel pipe
1. Aluminum-plastic composite pipe The aluminum-plastic composite pipe is the first water supply pipe to replace the cast iron pipe. Its basic structure should be five layers, namely plastic, hot melt adhesive, aluminum alloy, hot melt adhesive, and plastic from the inside to the outside. The alu...Read more -
Prevent decarburization of steel pipe surface
The key to resolving the problem of surface decarburization lies in the heat treatment process. Since the decarburization and the oxidation of the steel wire are carried out at the same time, as long as the steel wire is kept in contact with air as little as possible during the heat treatment pro...Read more -
Oil and gas pipeline welding construction technology
1.1 Manual welding with cellulose downward electrode When there is a pipeline with severe hydrogen sulfide corrosion or a pipeline operating in a cold environment, use a low-hydrogen type vertical downward welding electrode. Due to the flexibility of manual welding and the low requirements of wel...Read more -
Winding 3PE anticorrosive steel pipe
3pe anti-corrosive steel pipes are pipes (steel pipes) used in different working environments. To slow down or prevent the pipes from being corroded and deteriorated by the chemical or electrochemical action of the external medium or by the metabolic activities of microorganisms, the outer wall o...Read more
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