CHOICEAs the generator market becomes more lucrative, the choice of brands available gets more extensive.As part of a recent revamping of its ironing products, Morphy Richards added a steam generator to its range. To promote its new offering, which is called the Jet Stream Elite and retails for 149.99 [pounds sterling], the maker is giving away a free Brabantia ironing board with each sale. Morphy has also upgraded its Turbosteam and Comfi-Grip iron ranges.Tefal''s new top end model is the Turbo Pro Express (2940), which retails for a little under 200 [pounds sterling]. This model needs only two minutes warm-up time and offers a continuous 80g a minute of steam with a mighty 100g/m turbo function.

Here we have the rhythm of the book, which resembles the surface of a pond disturbed by a thrown pebble. Anyway, there are screws in Ramelli''s book, presuming absent screwdrivers, and we have retreated another century.De Re Metallica backs up again, to 1556, with the illustration of a slotted screw to attach the leather to a bellows. An illustrated manuscript of 1475 to 1490--a sort of household manual for a castle--shows slotted screws fastening a leg iron and a pair of manacles--castle staples. This train of thought leads the author to war, a great stimulus to invention, witness radar and the jet engine. Pollard''s History of Firearms illustrates a fifteenth-century German equivalent of the sawed-off shotgun in which the stock is screwed to the metal. Research in the Metropolitan Museum of Art turned up a screw of the 1480s attaching parts of a suit of armor. Screws were slotted with a hacksaw and the threads were filed by hand until, in 1760, Job and William Wyatt in Staffordshire patented a machine that turned out more consistent screws at the rate of one about every six seconds. The author comments that, a century before the industrial revolution, "their factory was the earliest example of an industrial process designed specifically to shift control over the quality of what was being produced from the skilled artisan to the machine itself"

Filler-metal selection for FCAW depends on base-metal composition, cleanliness of base metal, thickness, a0d service. AWS specifications: A5.20, Specification for Carbon Steel Electrodes for Flux-cored Arc Welding, for low-carbon steel up to 0.15 C and mild steel 0.15 to 0.29 C; A5.29, Specification for Low Alley Electrodes for Flux-cored Arc Welding, for steel of higher carbon content and the low-alloy types; A5.22, Specification for Flux-cored Corrosion-Resisting Chromium and Chromium-Nickel Steel Electrodes, for stainless steels.Gas-Tungsten-Arc Welding (GTAW, TIG)GTAW rises an arc between a nonconsumable electrode and the work. It joins with or without filler metal. AWS A5.12 lists electrode types and sizes. All are tungsten, some with thoria, zirconia, ceria, or lanthana added. Thoria provides higher current-carrying capacity than prime tungsten with less contamination of the weld pool. Other benefits: better arc start, greater arc stability. Zirconiated electrodes perform well with alternating current: the arc is stable, the electrode retains a (tailed end during welding, and has current-carrying capacity of thoriated electrodes. Zirconiated electrodes resist contamination and minimize tungsten contamination of weld metal.

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