An important advantage arises with the choice of the base material. Pipes
with standard sizes are used, i.e. the same pipes as demanded for your
piping system. Hot forming of fittings usually requires special non standard
sized pipe as base material which often leads to long delivery time - or in
case of exotic steels additionally to mini-mum production quantities.
The WS-cold forming technique offers easy solutions even for your most
You supply the pipe - we produce the fittings from your pipe.
Stress calculations show that the tension occurs in the crotch area. Therefore
the reinforcement of this area becomes very important. The WS-cold forming
fully complies with this requirement. The wall thickness on the inner radius is
always heavier than on the outside. By using the hot forming method, the wall
thickness is the same on all parts of the elbow. Therefore, the elbow has to
be manufactured with a heavier wall. The different technology automatically
results in different base material weights. The method that we have chosen
therefore clearly lowers costs.
The tools used in WS coldforming correspond exactly to the outside of the elbow, tee or reducer. The result is: a high dimensional accuracy of the final product.
WS-cold forming eliminates the possibility of mechanical damage to the
inside of the elbow. Even pipes with extreme diameter/wall thickness
proportions (DN 5"x1.3" wall thickness) can be formed without difficulties.
The cold forming process chosen and further developed by us guarantees
an ex-tremely gentle handling of material. The degree of deformation in radius
direction is almost 0% and in axial direction less than 10%.
The WS-cold forming guarantees a low degree of forming. The material will
not be exposed to thermal stress during the manufacturing process. The
structure of the formed fittings is absolutely free of any structure loosening
and micro cracks. The grain structure remains unchanged. All WS-fittings
with wall thicknesses up to 6 inches are cold formed and then solution
annealed. This method has numerous advantages over hot forming, which
has mainly been used up till now. We would like to point out that the above
cold forming advantages are based on a heavy wall elbow as an example.