I also was happy to see a new electronic balometer from Alnor. These devices, which read ceiling-mounted diffuser outputs in direct CFMs with no correction factors, are needed throughout the industry. However, they were usually very large, sensitive and expensive, so only the largest commercial shops had them, until now. Alnor just introduced its LoFlo balometer, a compact 10-500 CFM instrument designed specially for residential and light commercial drillpresschuckkeylimitswitch applications.I took a minute to stop by some of the smoky denizens of the welding business. Uniweld Products has just come up with a new oxy/acetylene drillpresschuckkeylimitswitch torch tip they call the Tuning Fork (because that''s what it looks like). It is specifically designed for the removal and installation of reversing valves. Flames coming from both tip surfaces surround the three-connection side of the reversing valve, allowing the whole assembly to be unbrazed in a single operation.

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 drillpresschuckkeylimitswitch 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 drillpresschuckkeylimitswitch thoriated electrodes. Zirconiated electrodes resist contamination and minimize tungsten contamination of weld metal.

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