Exploration • Drilling • Field Services


magnitude of stress is repeatable when adopted as a production technique. Tis is particularly critical when applied to large welded structures as the surface/weld profile can influence the benefits gained.


Te media selected will be a function of the size


of the structure, the geometry at the toe of the weld and the surface roughness generated by the weld lapping process. A dressed weld will remove these geometrical considerations.


Heat affected zone Te traditionally accepted problem of welding stresses at the heat affected zone has been tackled by a variety of means and their success varies. Termal or mechanical stress relieving has an effect on the residual tensile stresses, although some may still remain, but less effect on the applied stresses. Controlled shot peening can be applied to a


welded area with benefit. However a greater benefit can be achieved by peening a dressed weld, because the stress concentration areas have been reduced and impurities close to the weld surface have been removed. Controlled shot peening can be applied to many structures on site. Te industries presently


using this technique include the chemical, oil and gas, highway and construction, power generation, aerospace and other large transport industries. Te process controls mentioned earlier are applied in all of these situations. Media is taken to site and examined initially and continuously to ensure the desired profile of residual compressive stress is maintained. Should the volume of site work demand it, grading equipment is taken to the site and media recycled for size and shape consistency. Te intensity of peening will be governed by the equipment taken on site to impart the necessary level of intensity required on welded structures. Offshore welded structures provided adequate scaffolding and access is available, provides no problem. Metal Improvement Company is a specialist in enhancing the performance and extending the life of critical components such as turbines, pumps, compressors, steel tubing systems, welded structures and assembles by solving the issues of metal and corrosion fatigue, stress corrosion cracking, fretting, spalling and wear. ●


For more information ✔ at www.engineerlive.com/iog


Ben Hayes is with Metal Improvement Company, a business unit of Curtis-Wright Surface Technologies. www.cwst.co.uk


Manufacture of industrial measuring devices and automation equipment


Pressure transmitters


Hydrostatic level probes


Temperature transmitters


Pressure Transmitters


with diaphragm seals


Positioners


Differential pressure transmitters


transmitters Data loggers


Level switches


Electromagnetic flowmeters


www.aplisens.com For more information ✔ at www.engineerlive.com/iog


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