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With donated and discounted building materials, and cash contributions from sponsors, Habitat helps families who need housing, and who commit to working shoulder-to-shoulder with community volunteers throughout the construction of their homes. In Tucson, Arizona, for example, single-parent families must agree to donate 200 hours of labor on the building or in the Habitat office; two-parent families must donate 400 hours of sweat equity, says Yvonne Coelet, Director of Public Relations.Houses are priced affordably and the families who move in are given zero-interest loans. The interest-free loans and community underwriting of the project through volunteer labor and donated materials means home payments for the new residents are typically much lower than the rent payments they were making previously. In Tucson, families living in rental units pay at least $.500 per month. In contrast, house payments for Habitat homes are typically about $350 per month. "With a house payment that''s significantly lower than rent," says Coelet, "families can get ahead in life."

Select hardfacing materials based on weld-deposit microstructure and the wear situation the part will encounter, with consideration given to thermal treatments applied to the material before and after hardfacing. Deposit chemistry can be crucial in attaining the desired corrosion resistance or wear properties, or for minimizing the risk of solidification cracking. Acceptable deposit chemistry is achieved through the initial choice of consumables, using wire analysis and flux composition, and by specifying the number of weld passes needed to reduce parent-metal dilution to within acceptable limits. With the submerged-arc process, the flux and electrode govern the characteristics of the applied hard facing. For example, those fluxes neutral to manganese and silicon are not necessarily neutral to carbon and chromium, elements that matter most in hardfacing.