Hastelloy C22 Welded Pipe

What is Hastelloy C22, and why is it used in welded pipes?

Hastelloy C22 is a high-performance nickel-based alloy widely used in various industries due to its exceptional corrosion resistance and mechanical properties. It is designed to withstand harsh environments, including highly corrosive acids, chloride solutions, and oxidizing media. Hastelloy C22 contains a combination of nickel, chromium, molybdenum, and tungsten, which provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking.

When it comes to welded pipes, Hastelloy C22 offers several advantages. Its excellent weldability ensures that the pipes can be joined efficiently and securely. The alloy exhibits minimal heat-affected zone (HAZ) and weld metal precipitation, reducing the risk of intergranular corrosion. Hastelloy C22 welded pipes also maintain corrosion resistance even after welding, making them highly reliable in corrosive environments. The alloy's exceptional mechanical strength and thermal stability further contribute to its suitability for welded pipe applications, providing durability and resistance to deformation under high-pressure conditions. Overall, the combination of corrosion resistance, weldability, and mechanical properties make Hastelloy C22 an ideal choice for welded pipes in chemical processing, petrochemicals, pharmaceuticals, and waste treatment, where resistance to corrosion and reliability are paramount.

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What are the key properties and characteristics of Hastelloy C22 that make it suitable for welding applications?

Hastelloy C22 possesses several key properties and characteristics that make it highly suitable for welding applications. Firstly, its exceptional weldability stands out, as it allows for the efficient and reliable joining of the material. The alloy exhibits low thermal cracking susceptibility, ensuring the welded joints remain structurally sound. Hastelloy C22 maintains its corrosion resistance after welding, thanks to its composition and metallurgical stability. That is crucial in welding applications where exposure to corrosive environments is common.

The alloy offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, common concerns in welded structures. Its ability to withstand various corrosive media, including acids, chlorides, and oxidizing agents, adds to its appeal for welding applications in various industries.

Hastelloy C22 demonstrates high mechanical strength, allowing welded structures to withstand demanding operating conditions, such as high temperatures and pressures. Its thermal stability minimizes the risk of deformation or embrittlement during welding, ensuring the integrity and longevity of welded joints.

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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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