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A Lincoln Electric Innovation

HyperFill™ is a patent-pending twin-wire gas metal arc welding (GMAW) solution that is set to revolutionised high deposition welding. Developed for semi-automatic or robotic applications, HyperFill increases the usable deposition rate compared to traditional single-wire GMAW while delivering excellent penetration profiles, weld quality and puddle stability.

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South Africa-based coating specialist, Thermaspray, has recently launched a laser cladding facility capable of refurbishing worn or mis-machined components that traditionally could not be refurbished. In addition, the process offers a wide array of protective overlays to new components in industries such as the automotive, petrochemical, offshore oil and gas, pumps and valves, mining and turbomachinery, to name a few.

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By consultant metallurgist Michael Fletcher

Significant recent developments have been made that have resulted in the introduction of new nickel alloys that offer major improvements in mechanical properties. Not least is Inconel 740H [1], a nickel-based, precipitation hardenable superalloy that offers a unique combination of high strength and creep resistance at elevated temperatures, along with resistance to coal ash corrosion. The alloy was originally used for A-USC boiler tubes in the superheater sections of power plants but has been adapted for use in steam headers. A-USC boiler tubes are typically sized at between 38 and 76 mm in diameter, while main steam header pipes can have outer diameters  of 305 mm and wall thicknesses exceeding 38 mm. Seamless reheat piping with diameters of up to 760 mm is also now a target for the Inconel 740H alloy.

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“The past year has certainly been an interesting and difficult one and it has had an impact on SAIW, began Maroga. “It is increasingly difficult for people to make time for involvement in organisations such as the SAIW and we therefore appreciate the valuable assistance and contribution of each Board member,” he added before introducing the 2019/2020 SAIW Board members that had been elected: Johan Pieterse, Robin Williamson, Joseph Zinyana, Gert Joubert, Dawie Olivier, Ben Beetge, Paulo Trinchero, John Tarboton, Louis Breckenridge, Tony Paterson and Tom Rice.

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“In today’s manufacturing environment, customers are expecting their supply partners to become more integrated into their eco-systems, be more agile as well as being able to provide unique and globally competitive solutions for their operations. Within this context, “Air Liquide has further evolved a number of its offers which aim to provide its customers with world class solutions” begins Schluep. “The first of these solutions is the Air Liquide hardgoods offering which encompasses a 3-metre radius around the welder and aims to support our customers with a fully inclusive solution”.

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At Eskom, we are busy with a programme to replace traditional radiographic testing (RT) with phased-array ultrasonic testing (PAUT) to validate the quality of the boiler tube welds at our power plants. During shutdowns, we do about 100 000 boiler tube repairs per year and every repair has to be inspected using NDT to ensure that the welding is of an acceptable quality.

African Fusion visits the fabrication facilities of Tsipe Engineering near Rosslyn in Pretoria North and talks to the company’s MD, Martin Krebs, about his investment in a Torchmate 4800 air plasma cutting system from Lincoln Electric distributor Cosmo Automation Solutions, a purchase that has transformed the sustainability and service potential of his SME.

by R French, W Yeadon, G Kapellmann-Zafra and H Marin-Reyes

This paper – from the IIW 2018 International Conference hosted by the Indonesian Welding Society on 19 and 20 July 2018 in Bali – follows observations of novel weld-pool activity during TIG welding in the 300 to 1 000 A range at the University of Sheffield.

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Crown Publications, one of South Africa’s largest business-to-business publishing houses, came into existence in 1986. Since then, the company has grown from producing a single magazine, Electricity SA (renamed Electricity+Control), to publishing six monthly magazines, three quarterlies, and a number of engineering handbooks.

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