It is imperative to weld and cut the spiral
steel pipe structure in the application of spiral steel pipe. Because of the
characteristics of the spiral steel pipe itself, the welding and cutting of the
spiral steel pipe have its particularity compared with ordinary carbon steel,
and it is easier to produce numerous defects in its welded joint and
heat-affected zone (HAZ). The welding performance of the spiral steel pipe is
mainly manifested in In the following aspects, the high-temperature crack
referred to here refers to the cracks related to welding. Elevated temperature
cracks can be roughly divided into solidification cracks, micro-cracks, HAZ
(heat affected zone) cracks, and reheating cracks. Low-temperature cracks
sometimes occur in spiral steel pipes. Because the main reason for this is
hydrogen diffusion, the degree of confinement of the welded joint, and the
hardened structure, the main solution is to reduce the diffusion of hydrogen
during the welding process, and appropriately perform preheating and post-weld
heat treatment and reduce the degree of confinement.
The toughness of welded joints in spiral
steel pipes is to reduce the susceptibility to high-temperature cracks, and the
composition is usually designed to ensure that 5%-10% of ferrite remains.
However, the presence of these ferrites leads to a decrease in low-temperature
toughness.
When the spiral steel pipe is welded, the
amount of austenite in the welded joint area decreases, which influences the
toughness. Also, with the increase of ferrite, its toughness value has a
significant downward trend. It has been proved that the reason for the
noticeable decrease in the toughness of welded joints of high-purity ferritic
stainless steel is due to the mixing of carbon, nitrogen, and oxygen.
Threeway Steel is known as a professional supplier engaged in manufacturing and distributing a wide range of steel pipe, and our headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
