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Welding neck flanges
Source :admin   Time:3/7/2017 10:22:03 PM   hit:

  The heavy welding neck flanges

       The heavy welding neck flanges are also named heavy WN flanges, which are 

hot formed from a circular section of steel plate having a very small co-axial 

hole in the flange center. The steel around the hole is shear-formed downward 

and outward by a tapered die plug which is forced by the small hole forming an 

 integral neck on the weld neck flange. A supporting ring die is radiused at its 

 inner corner to form a suitable fillet radius at the junction of the neck with 

 the flange proper. A suitable pre-forming or post-forming operation may be 

 required to compensate for any deflection in the work piece out of planar 


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