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John Deere has also increased filter performance on new equipment because of concerns about fuel contaminants. While investigating fuel injector problems, field service representative Greg Clampitt, from Deere''s Waterloo, Iowa, Engine Works, discovered good reason for that concern.Clampitt used fuel testing equipment on tractors operating in several states. The equipment counted particles as small as 2 microns both before and after the fuel filtration system (see chart below).Surprising results"The radio results were surprising, and we think they relate to fuel storage and handling," says Clampitt. "We tested tractors in Texas and, on average, found 25 times more particles in the 2-to 5-micron size range than on tractors tested in Iowa. There were 40 times more particles from 5 to 15 microns in size in Texas. Results from tests on tractors in Arizona and California fell between the Texas and Iowa findings.

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 controlled alloy steels, nickel and copper alloys, and materials that serve in corrosive atmospheres, chemical composition is important. Consider the possibility lawn of electrochemical corrosion between base and weld metal of different compositions.