Inconel 625 Welded Pipe

What is Inconel 625 welded pipe, and what are its key features and properties?

Inconel 625 welded pipe is a piping material specifically fabricated using Inconel 625 alloy. Inconel 625 is a nickel-chromium-based superalloy renowned for its exceptional resistance to high temperatures and corrosive environments. This alloy exhibits remarkable strength and durability, making it suitable for applications in various industries such as aerospace, chemical processing, oil and gas, and marine engineering.

The key features and properties of Inconel 625 welded pipe stem from its unique composition. It contains a significant amount of nickel, which provides excellent resistance to corrosion and oxidation, even in highly demanding conditions. Additionally, the alloy incorporates chromium, contributing to its resistance against localized attacks such as pitting and crevice corrosion. The combination of nickel, chromium, molybdenum, and niobium imparts exceptional strength and toughness to the welded pipe.

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What are the applications and industries where Inconel 625 welded pipe is commonly used?

Inconel 625 welded pipe finds extensive use across various applications and industries due to its exceptional properties. One prominent industry where it is commonly employed is aerospace. Inconel 625's high strength, resistance to extreme temperatures, and excellent corrosion resistance make it ideal for aircraft and spacecraft components, such as exhaust systems, thrust reversers, and engine components.

The chemical processing industry also extensively utilizes Inconel 625 welded pipe. Its resistance to various corrosive environments, including acids, alkalis, and seawater, makes it well-suited for chemical processing plants, where it is employed in pipelines, reactors, heat exchangers, and valves.

Oil and gas exploration and production also benefit from Inconel 625 welded pipe. The alloy's ability to withstand harsh conditions, including high-pressure and high-temperature environments, makes it suitable for use in downhole tubing, offshore drilling operations, and subsea equipment.

Inconel 625 welded pipe in the marine industry is utilized in applications such as seawater piping systems, offshore platforms, and shipbuilding. Its resistance to corrosion and erosion from saltwater exposure makes it highly reliable in marine environments.

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Electric Resistance Welding (ERW) Process

Pipe is created using the Electric Resistance Welding (ERW) process by cold-forming a flat steel sheet into a cylindrical shape. The steel is then heated to a degree at which the edges of the steel cylinder are pressed together to establish a bond without the use of welding filler material.
Several Electric Resistance Welding (ERW) processes are available for pipe production. The two main types of ERW are:
. High Frequency Welding
. Rotary Contact Wheel Welding.

High Frequency Welding

In high frequency induction welding, a work coil is placed in front of the weld spot and acts as a conduit for the weld current to reach the material. Work coil does not come into contact with pipe. Through the magnetic fields that surround the pipe, an electrical current is induced into the pipe's substance. When changing pipe size, high frequency induction welding avoids contact marks and requires less setup time.

Rotary Contact Wheel Welding

The electrical current is passed through a contact wheel at the weld spot in rotary contact wheel welding. A portion of the forge pressure required for the welding process is also applied by the contact wheel. AC, DC, and square wave are the three primary types of rotary contact wheel welders. Electrical current is transferred in all three power supplies by brush assemblies that interact with slip rings attached to a revolving shaft that holds the contact wheels. The current is sent to the strip edges through these contact wheels.

Submerged Arc Welding (SAW) Process

A constantly fed bare wire electrode and the workpiece form an arc during the submerged arc welding (SAW) process. To produce protective gases, slag, and to add alloying components to the weld pool, the procedure requires a flux. Using a shielding gas is not necessary. Excess flux is recycled via a hopper as the arc advances along the joint line. After welding, any remaining layers of fused slag are simple to remove. The arc is generally invisible during welding because the flux layer totally covers it, and heat loss is also very minimal. In contrast to the manual metal arc's 25% thermal efficiency, this one can reach 60%.
There are two types of Submerged Arc Welding (SAW) processes:
. Longitudinal Submerged Arc Welding (LSAW) Process
. Spiral Submerged Arc Welding (SSAW) Process

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