i new on this forum site so please sorry if this asked already my question is what is the weld neck flange and how its produce?

 

There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts. Vikas Shah

 

you can search wuxi kewangda forging factory: http:www.wxkwddz.com,they make weld neck flange,according to forging.