DSAW is the abbreviation of "Double Submerged Arc Welding" in English, and its full name is Double Submerged Arc Welding. This is a welding process used for manufacturing steel pipes, and it is particularly suitable for the production of large-diameter spiral steel pipes.
The main features of the DSAW steel pipe are as follows:
- Process principle: The internal and external surfaces of the steel pipe are respectively welded using submerged arc welding, resulting in double-sided welds.
- Advantages: Uniform weld seam, high strength, few pores, stable quality, and strong pressure-bearing capacity.
- Applicable scenarios: Particularly suitable for the production of thick-walled large-diameter steel pipes. It has a high degree of automation and is suitable for large-scale engineering supply.
Main application fields:
- Oil and gas transportation pipelines (especially high-pressure oil and gas pipelines)
- Urban water supply pipeline network
- Wastewater treatment plant pipes
- Natural gas main network
- Industrial steam conveying system
Comparison with other welding techniques:
- ERW (Resistance Welding): Suitable for thin-walled pipes, mainly used for water transportation or structural purposes
- DSAW: Suitable for thick-walled, high-pressure pipelines, with higher weld strength and better durability.
DSAW steel pipes usually need to comply with standards such as GB/T 9711 or API 5L, and undergo ultrasonic testing and X-ray inspection to ensure their quality.
| Characteristics | DSAW (Double-sided Arc Welding) | LSAW (Longitudinal Arc Welding) |
| Definition Core | Welding process: It refers to the welding of both the inner and outer walls of the steel pipe by submerged arc welding |
Forming process: It refers to rolling steel plates into straight seam pipes and then welding them using submerged arc welding |
| Weld seam form | It can be a spiral seam (such as SSAW steel pipe) or a straight seam (such as LSAW steel pipe) | Only straight seams. Its welding can be carried out by single-sided or double-sided (DSAW) submerged arc welding. |
| Common relationships | DSAW is a commonly used welding method for LSAW steel pipes (especially thick-walled pipes). The weld seam of an LSAW steel pipe is very likely to have been welded by the DSAW process. |
LSAW steel pipes can be made by DSAW process or other welding processes |
| A common metaphor | Like the "double-sided glass" process of mobile phones, it describes how to "bond" | Like the "straight bar shape" of a mobile phone, it describes the overall "shape". |
DSAW is a welding process, while LSAW is a steel pipe forming process. The two describe features in different dimensions.
