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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 -
Main use and process characteristics of galvanized steel pipe
The main purpose of galvanized steel pipe Galvanized 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 war...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 -
What are the classifications of stainless steel pipes
1. Stainless steel pipes are classified by material Divided into ordinary carbon steel pipes, high-quality carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, as well as bimetallic composite pipes, plating and coating pipes to save...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 -
Key points of internal thread tapping of stainless steel pipe fittings
1 Tap design and manufacture a. Choose a better tap material. Adding special alloy elements to ordinary high-speed tool steel can significantly improve the wear resistance and toughness of the tap. b. Coating titanium nitride coating into the surface of the tap thread can significantly improve th...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 -
How to seal threaded steel pipe fittings
Through the colorless tape (plaster tape) on the thread, this is more efficient. 1. First, apply lead oil evenly on the outer thread of the thread, then evenly wind the hemp wire in a clockwise direction, and then screw on the inner wire steel pipe fittings and connectors (this method is a method...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
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