Here are some of the key applications:

1. Construction and Infrastructure:

   - Water and Sewage Systems: Used for water supply and sewage pipelines due to their ability to withstand high pressure and environmental stress.

   - Structural Support: Employed in building frames, columns, and scaffolding for construction projects.

   - Bridges and Roads: Integral in the construction of bridges, tunnels, and highway guardrails.

2. Oil and Gas Industry:

   - Pipelines: Essential for transporting oil, natural gas, and other petrochemical products over long distances.

   - Drilling Rigs: Used in the structure of drilling rigs and platforms, as well as in the casing and tubing for drilling operations.

3. Automotive Industry:

   - Exhaust Systems: Utilized in the manufacturing of exhaust pipes due to their resistance to high temperatures and corrosion.

   - Chassis and Frames: Used in the construction of vehicle frames and other structural components.

4. Mechanical and Engineering Applications:

   - Boilers and Heat Exchangers: Commonly used in the fabrication of boilers, heat exchangers, and condensers.

   - Machinery: Incorporated in various types of machinery for their durability and ability to handle stress.

5. Agriculture:

   - Irrigation Systems: Employed in irrigation systems and water distribution networks.

   - Greenhouses: Used in the structural framework of greenhouses.

6. Shipbuilding and Marine Applications:

   - Ship Construction: Integral in the construction of ships and offshore structures due to their strength and resistance to harsh marine environments.

   - Dock Piping Systems: Used in piping systems on docks and ports.

7. Electrical Industry:

   - Conduits: Utilized as conduits for electrical wiring due to their protective qualities.

   - Poles and Towers: Used in the construction of electrical transmission towers and poles.

8. Energy Sector:

   - Wind Turbines: Employed in the construction of wind turbine towers.

   - Power Plants: Used in various piping systems within power plants, including those for steam and water.

9. Furniture and Decorative Applications:

   - Furniture Frames: Used in the manufacturing of frames for various types of furniture.

   - Fencing and Railings: Employed in decorative fencing, railings, and gates.

10. Industrial and Manufacturing:

    - Conveyance Systems: Used in manufacturing plants for transporting fluids, gases, and other materials.

    - Factory Structures: Incorporated in the framework of industrial buildings and structures.

Welded steel pipes are chosen for these applications due to their versatility, reliability, and the ability to be manufactured in various sizes and specifications to meet specific project requirements.