This flange is circumferentially welded into the system at its neck which means that the integrity of the butt welded area can be easily examined by radiography. The bores of both pipe and flange match, which reduces turbulence and erosion inside the pipeline. The weld neck is therefore favoured in critical applications. Detailed Product Description Type: Welding neck Standard: ANSI, MSS, API, AWWA, DIN, JIS, BS and GB. Size: 15mm to 5,000mm. Materials: Carbon steel, stainless steel and alloy steel. Process: Flanges and forgings. Printing : Carbon steel and alloy steel with yellow print, black print, oil or zinc. Packing: Plywooden case. We can also manufacture special application flanges and forgings that customers require.