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This article is the story of our experiences developing and running the iWRS AI control system.The Early YearsBy 1995, the AI controls team had been working with several groups in the Crew and Thermal Systems Division (CTSD), building Al control systems in support of CTSD''s investigations in advanced life support (ALS). In 1995, they put a man in an airlock linked to a 10-foot-diameter chamber full of wheat (Laifook and Ambrose 1997). For 15 days, the man lived, worked, and exercised in the chamber as the wheat crop took in his carbon dioxide and produced oxygen for him. The control system--our first for ALS--monitored and provided caution and warnings for the climate and nutrient environment of the wheat crop.

However, many industry pundits claim these gizmos are nigh-on revolutionary, as claims fly around about how time at the ironing board can be slashed by 50% a week when using one. All agree, too, that the benefits of steam generators soon dispel the issue of cost to a customer who, a few loads of ironing down the line, will wonder how they coped in those darker pre-generator days; just as dishwasher owners can''t imagine how they ever managed without a dishwasher."Cost immediately dismisses them [steam generators] from consideration for most buyers but those who see or get the chance to use a generator tend to put one at the top of their buying list, so the potential is enormous," says Alan Poulain, director of small appliance sales at BSH,

1. Mechanical properties of the base material. Tensile strength and yield strength of the weld metal should equal or exceed that of the base material. Ductility and toughness at low temperatures may also be important. High-temperature service requires resistance to creep. Shock loading requires impact resistance. In general, weld metal should match base-material properties.2. Composition of the base material.For stainless steels, low alloy steels, nickel and copper alloys, and materials that serve in corrosive atmospheres, chemical composition is important. Consider the possibility of electrochemical corrosion between base and weld metal of different compositions.