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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 scootergirlamericanidol 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.

Filter maintenance problems can occur during winter months when the temperature of the fuel drops below the cloud point and wax starts to be filtered out. This accumulated wax will eventually dissolve when the fuel heats up and may cause some operation problems such as rough running and black smoke. Winter conditions may require switching to #1 diesel fuel if available. Fuel-Injection Pumps -- There are two basic types of fuel injection pumps: in-line and distributor. (In February, I will explain how a distributor pump operates and discuss some troubleshooting hints). Both in-line and distributor pumps may include a separate, built-in transfer pump.

Fuel Injector Nozzles -- Injector nozzles contain a chamber that fills with fuel. When the chamber is full, pressure increases rapidly. The high pressure pushes against a piston that pushes against a spring. When the fuel pressure exceeds the spring pressure, the spring starts to collapse. As the spring collapses, the piston moves up, uncovering either a single or a multitude of holes. The fuel rushes out the holes into the combustion chamber or pre-combustion chamber. When all the fuel has left the injector nozzle, the spring pushes the piston back on its seat, tightly sealing the nozzle.