Q. What are the differences between soldering, brazing and welding?
Ans.
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S.No.
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Welding
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Soldering
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Brazing
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1.
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Welding is a process in which two or more similar metals are permanently united by bringing them to fusion temperature.
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The soldering is a metal joining process by means of a fusible alloy or metal and is applied in molten state spreads between properly fitted surfaces of joint by capillary action.
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Brazing can join any two dissimilar metals. In brazing the base metals are heated to a temperature that is below the fusion temperature. The joint is formed by capillary action of filler material.
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2.
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In welding the filler material (flux) is added at the joint and solidified at same place.
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Filler material used in soldering has low melting point will below 427ºC.
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Brazing filler material has melting point above 427ºC.
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3.
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In welding, the welding arc penetrates deep into base metals.
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In soldering there is no such penetration.
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In brazing, there is no such penetration.
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4.
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Strength of welded joint is similar to base metals.
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Soldered joint is weaker in mechanical strength.
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Brazing operation gives a joint with moderate strength.
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