Photo Gallery: FSW Rig
The pictures are of a Test Rig for an
experimental welding process, the rig applies a tensile load to two samples simultaneously
of up to 38 tonnes each.
The samples are only 125mm
wide and must have the load applied on the centre line, to achieve this, special
hydraulic cylinders were designed and manufactured working at up to 350 Bar. The
cylinder bore size required to provide this load would not allow the cylinders
to be positioned side by side, the cylinders were mounted one behind the other
so that the cylinder centres are 125mm apart.
load on each sample was infinitely variable and digitally displayed, also sample
extension was digitally displayed accurate to 0.01mm, measured by LVDT's mounted
under the main bed of the rig.
The hydraulic pressure
to each cylinder, and therefore the load applied, was controlled by proportional
pressure reducing valves, operating in closed loop control with pressure transducers
providing feedback to the electronic control module. The operator can select the
pressure required for each cylinder, by entering it into the control module, and
the proportional system maintains the required pressure throughout the test.
that could easily be attached to the ends of the samples, without distortion,
that would operate at 38 tonnes load were designed and fixed directly to the
The original experiment was successful, further, much larger, rigs have now been designed to take the process into production.
Click image for close-up