Unformatted text preview: Joining Metals
Thursday, November 04, 2010 9:25 AM Joining Metals Welding- fusion process some of the base metal is melted. Frewuently use a filler of approximately the same metal (like casting on a small scale) It has a strong bond. High Temperature- above Tm Brazing- filler metal melts but the base metal does not. T > 1000 F. Usually used with steel or iron. Filler metal, brass or bronze. Strong-have a diffusion bond Soldering- uses a low melting point filler metal (lead-tin allow) or lead-free solder. Can only withstand low stresses-1000 psi. Fluxes are used in soldering and brazing (sometimes in welding), it breaks down the oxides on the surfaces of the base metal. Heat
Picture 1 Picture 2 Form an oxide coat with flux
Picture 3 Picture 4 Picture 5 Which one of these you select depends on the strength needed- and T limits welds- have a heat affected zone. Properties can be very different. ...
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- Fall '10