Short flat welded flange, also known as lap welding flanges. Welded flange connection with the pipe flange is first inserted into the bore of the tube to the appropriate location, and then take the welding. The advantage is that when welded flange for welding assembly easier, and the price is cheap, so flat welding flange has been widely used. Calculate the internal pressure welded flange welded flange corresponding strength of about two-thirds of the fatigue life is about one-third of welded flanges. So welded flange pressure rating applies only to relatively low pressure fluctuations, vibration and shock are not serious pipeline system. Welded flange can be subdivided into two with neck flat flange flange plate flat welding and soldering. I plant welded flange reliable quality and reasonable price, welcome customers to consult purchase.