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.

About SPS CommerceSPS Commerce is the leading provider of hosted supply chain integration services. The company aftermarketseatheaterauto specializes in managing trading partner enablement and management programs to increase the depth and/or breadth of integration with trading partners -- especially small and mid-sized partners. Our solution has helped many large retailers and distributors, electronically enable and integrate over 52,000 trading partners into their e-supply chain. For more information, visit www.spscommerce.com or call (651) 603-4400. SPS Commerce is a registered trademark of SPS Commerce Inc., spscommerce.net and the SPS Commerce logo are the property of SPS Commerce, Inc. All other names and trademarks are the property of their respective holders. In 1996 my wife and I purchased a house on 15 acres in suburban Pittsburgh, Pennsylvania. The land, which had been neglected for many years, consisted of about two acres of lawn, another two acres of badly overgrown pasture and the remainder was wild woods. We knew we needed a tractor to help us take care of it all, but what kind, how big, what features and how much were all questions we hadn''t a clue how to answer. Since then we''ve learned a lot about tractors from friends, neighbors, tractor dealers and, of course, the Internet. We also learned we weren''t alone: Lots of other people moving from a city environment to a rural one had many of the same aftermarketseatheaterauto questions about tractors. This article is condensed from the information we''ve learned about tractors over the past several years. I decided to gather the common questions and answers we''d discovered into a Web site called "The Small Tractor FAQ (Frequently Asked Questions)." You are welcome to visit the Web site (www.andrew.cmu.edu/user/kb13/TF_home.htm), which contains links to tractor manufacturers, implement suppliers, tractor discussion groups and lots of other information and resources for and about small tractors.

IT''S NOT LIKE THE L.A. CAR scene, where you are what you drive," says Sherri Walker, editor and publisher of The Catalina Islander. A quiet woman with short blond hair, she sits on a bench by the sand, steps from her office door. She looks up Avalon''s main street at the line of nearly identical white golf carts parallel-parked nose-to-tail along the curb. "No one points and says, `Wow, look at that golf cart.''"In 1979, suffering from choking traffic congestion and a critical shortage of parking, this mile-and-a-half-square town passed City Ordinance No. 656, mandating negative population growth for cars; two must leave Catalina Island before another is allowed on. "The last person to get a new auto permit signed up 13 years earlier," says Bill Loomis, the harried local vehicle clerk, "and the wait is getting longer." Only 718 cars remain, but the ordinance does permit one "autoette," in official parlance, per dwelling unit, so Avalon has slowly become a city of golf carts. About 1,300 populate the town.

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