The application scope of welding flanges:

1. Welding extensions of workpieces: e.g., steel strips, profiles, wires, rebars, rails, boiler steel pipes, and pipelines for oil and gas transportation.

2. Welding of circular workpieces: such as the welding of automotive wheel rims and bicycle/motorcycle wheel rims, as well as the welding of various chain rings.

3. Component Welding: Welding simple rolled, forged, stamped, or machined parts into complex components to reduce costs. Examples include the welding of automotive steering shaft housings and rear axle housings, as well as the welding of various rods, links, and special parts.

4. Dissimilar Metal Welding: This process saves precious metals and enhances product performance. For instance, the welding of the working part (high-speed steel) to the tail (medium carbon steel) of cutting tools, the welding of the head (heat-resistant steel) to the tail (structural steel) of internal combustion engine exhaust valves, and the welding of aluminum-copper conductive joints, etc.

Welding flanges are primarily suitable for environments, which need to be determined based on specific conditions to ensure their actual usage value and performance, capable of withstanding high temperatures and pressures. Welding flanges are suitable for steel pipeline connections with nominal pressures not exceeding 2.5 MPa.

The sealing surface of the butt welding flange can be made in three types: smooth, concave-convex, and tenon-slot. The smooth type of butt welding flange is widely used, while the other two types are also quite common in use.