Hot-dip galvanizing and cold-dip galvanizing are two common metal surface treatment processes. They are widely used in industrial production, mainly to improve the corrosion resistance, aesthetics and wear resistance of metals.

Hot-dip coating, also known as hot-dip coating, is a metal coating process carried out under high temperature conditions. During the hot-dip coating process, the part to be coated is immersed in a molten metal bath. The metal forms a metallurgical bond with the base metal at high temperature, thus forming a strong metal coating.

Cold plating, also known as electroplating, is a metal coating process performed at room temperature. During the cold plating process, a metal or alloy coating is deposited on the surface of the base metal through an electrochemical reaction. Cold plating does not involve a high-temperature melting process, but rather uses electric current to drive the reduction deposition of metal ions.

Main differences:
1. Operating temperature: Hot-dip galvanizing requires high temperature, while cold-dip galvanizing is performed at room temperature.
2. Bonding method: Hot-dip plating forms a metallurgical bond with strong bonding strength; cold-dip plating forms a mechanical or chemical bond with relatively weak bonding strength.
3. Coating thickness: Hot-dip galvanizing can produce thicker coatings, while cold-dip galvanizing usually produces thinner coatings.
4. Appearance and performance: Hot-dip coatings are usually rough, while cold-dip coatings have a smoother surface. Hot-dip coatings generally have better corrosion resistance and wear resistance than cold-dip coatings.
5. Application areas: Select the appropriate coating process based on the specific needs and performance requirements of the product. For example, for large structural parts, hot plating is more appropriate; while for precision parts and decorative coatings, cold plating may be a better choice.

Both straight seam steel pipe and spiral steel pipe are types of welded steel pipe, but straight seam pipe is welded using high-frequency welding and submerged arc welding, while spiral pipe is welded using submerged arc welding. These pipes are widely used in national production and construction.

Welded steel pipe and spiral steel pipe have many differences due to their different production processes.

The production process for straight seam welded pipe is relatively simple. The main production processes are high-frequency welding and submerged arc welding. Straight seam pipe boasts high production efficiency, low cost, and rapid development.

Spiral welded pipe is generally stronger than welded pipe. Its main production process is submerged arc welding. Spiral steel pipe can be produced from billets of the same width to produce pipes of different diameters, and can even produce larger diameter pipes from narrower billets. However, compared with straight seam pipes of the same length, the weld length increases by 30~100% and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter thick wall double-sided submerged arc welded straight seam steel pipes mostly use submerged arc welding.

Double-sided spiral seam submerged arc-welded steel pipes are produced using an automated production line, which can achieve continuous and high-speed welding. This production method not only improves production efficiency but also reduces worker intensity.
Double-sided spiral submerged arc-welded steel pipe utilizes a submerged arc welding process, which offers advantages such as high welding speed, deep penetration, and high weld quality. At the same time, by welding inside the pipe, the influence of the external environment on the welding quality can be avoided.
Since double-sided spiral seam submerged arc welded steel pipes use high-strength steel strips as raw materials, they have good mechanical properties such as tensile strength, yield point and elongation, and can meet various engineering needs.
Double-sided spiral seam submerged arc-welded steel pipes are widely used in various projects, such as bridges, buildings, pipelines, etc. Its excellent performance and good adaptability enable it to maintain a stable working state in various harsh environments.