Soldering and Brazing are joining processes where parts are joined without melting the base metals. Soldering filler metals melt below 840 °F. Brazing filler metals melt above 840 °F. Soldering is commonly used for electrical connection or mechanical joints, but brazing is only used for mechanical joints due to the high temperatures involved.
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Soldering and Brazing Benefits
- Economical for complex assemblies
- Joints require little or no finishing
- Excellent for joining dissimilar metals
- Little distortion, low residual stresses
- Metallurgical bond is formed
- Sound electrical component connections
Soldering and Brazing Joining Problems
- No wetting
- Excessive wetting
- Flux entrapment
- Lack of fill (voids, porosity)
- Unsatisfactory surface appearance
- Base metal erosion
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