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News in brief - March/April 2001

Connect, no. 111, March/April 2001, p.6


TWI will be exhibiting at the MAX International show at the I-X Center in Cleveland, Ohio between May 6 -10 2001. TWI will be joined by C-spec at Booth 4318, and will be exhibiting their range of software products and examples of a range of joining processes available to its customer base. Please contact John Loader for more information. E-mail:

New processes for wear and corrosion resistant coatings for internal cladding of small bore components

A new Group Sponsored Project at TWI is investigating the production of robust coatings on the internal surfaces of tubular components (50-150mm internal diameter) using a number of processes.

Damage by wear and corrosion is a major factor determining the life of components such as pumps, valves and tubular sections used in the extraction and transportation of petroleum, gas and related products. Most current surface engineering solutions are unable to provide adequate coatings on the internal surfaces of small bore components. Current solutions include machining components from highly expensive alloys.

Processes investigated will include laser powder surfacing, rotational arc spraying (thermal spraying) and laser fusion of rotational arc spray coatings. Coating validation methods will include wear and corrosion testing. For further information contact Carole Reignier. E-mail:


Improving the reliability and cost performance of thermally sprayed aluminium coatings

TWI has set up a GSP to investigate new thermal spraying equipment and procedure optimisation for the production of high quality Thermally Sprayed Aluminium (TSA) coatings These give reliable corrosion protection for steel structures in a range of environments including deep water, tidal or splash zone, and general atmospheric corrosion. TSA coatings are already widely specified for protection of bridges, offshore structures, risers, piling, and ships. The success of TSA coatings on tension leg elements and production risers in depths to 150m has encouraged the oil industry to consider TSA at depths to 3000m.

Processes to be investigated will include conventional flame and arc spraying as benchmarks and new thermal spraying process variants such as High Velocity (HV) arc, inert gas shrouded arc and High Velocity Oxyfuel (HVOF) wire. Coating performance evaluation will include simulated deep-water and elevated temperature corrosion testing.

For further information contact Suman Shrestha. E-mail:

For more information please email: