New PDF release: Exploiting Advances in Arc Welding Technology

By TWI Ltd

ISBN-10: 1855734168

ISBN-13: 9781855734166

Complaints of a world convention organised by means of the TWI.

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Sample text

One of the problems identified was that the technology had not been developed to make the 'complete package of cleaning and inspection available. It was stated that whereas it might be possible to deploy an MPI system underwater to carry out inspection, there was still no means of reporting the findings in terms of a defect location, even based on an elementary clock system. An MPI system mounted 50 on an ROV had been tested in 1985, but the system was based on parallel conductors and was very difficult to deploy.

Together with the need for the use of ROVs the associated requirement was identified for a manipulator that would operate reliably at these depths. Workers at Woods Hole developed a dedicated manipulator and proved its reliability to operate at 700 metres during trials in the Mediterranean. The manipulator used was designed to operate at depths up to 6000 metres fully equipped with forward and side scanning sonar, still and video cameras and a manipulator. Whereas the majority of manipulators produced in the past had been designed for high strength so that they could be used for turning valves, cleaning and attaching wire guides, the manipulator described was more sophisticated and had less strength but could be finely controlled.

Where a protective coating has been applied to the steel, it is generally desirable to leave this as intact as possible and to inspect through the coating, since repair of coatings underwater is normally difficult and unsatisfactory. Where an indication occurs under a coating, the coating should normally be removed and confirmation of the indication obtained. Cleaning by hand to a bare metal finish is likely to be ineffective and to produce inconsistent results, with the possible exception of methods such as wire ropes and chains, although these can cause damage to the steel surface.

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Exploiting Advances in Arc Welding Technology by TWI Ltd


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