Plain welded flange refers to a flange connected with a container or pipe by a fillet weld. It is an arbitrary flange. According to the integrity of the connection between the flange ring and the straight cylinder section, the design is checked according to the integral or loose flange. There are two kinds of flange rings with neck and without neck. Compared with the neck butt welded flange, the flat welded flange has simple structure and less material, but the stiffness and tightness are not as good as that of the neck butt welded flange. Flat welded flange is widely used in the connection of medium and low pressure vessels and pipelines.

the requirement of welding flange.

1. 

In order to prevent the corrosion between the eyes due to the heating of the flange cover, the welding current should be kept not too large, less than about 20% than the carbon steel electrode, the arc should not be too long, the fast cooling between the layers, and the narrow pass is appropriate. 

2. 

The electrode should be kept dry when used, titanium-calcium type should be kept 150℃ dry for 1 hour, low a hydrogen type should be kept 200-250℃ dry for 1 hour, to prevent the electrode coating sticky oil and other dirt, so as not to lead to the increase of weld containing... 

3. 

During the welding of flat welded flange fittings, carbides are precipitated by repeated heating, which reduces corrosion resistance and mechanical properties of the product.

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