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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 scooternessaja 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.

Electric radiant heaters are one of those technologies that seldom get a glance from me. And maybe that''s why I was attracted to this exhibit. I didn''t see anything I recognized. I walked over to see what those black crates were that BBC Industries was exhibiting. They didn''t look like much, and then the radiant heat hit me. Thermazone Black Body radiant heaters are simple, unpretentious and are available in sizes from 450 watts to 6,000 watts.A former employer of mine, Novar Controls Corp., shocked me out of my shoes with its exhibit. The old Tesla coil spark machine was gone but Novar''s entire line of building controls has undergone a complete redesign, which includes attractive packaging, enhanced communications and new product names. In particular, the product renamed Lingo can now converse with almost all manufacturers'' equipment in their own protocols, including Lon Works and BACnet.