Brazing and soldering welding

One of the welding processes that used in Engineering field is the brazing. Soldering is similar to the brazing but there are several differences.
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1. Brazing And Soldiering Welding

2. Overview of Brazing and Soldiering Both use filler metals to permanently join metal parts, but there is no melting of base metals When to use brazing or soldiering instead of fusion welding: Metals have poor weld ability Dissimilar metals are to be joined Intense heat of welding may damage components being joined Geometry of joint not suitable for welding High strength is not required

3. Brazing Joining process in which a filler metal is melted and distributed by capillary action between faying surface of metal parts being joined No melting of base metals occurs Only the filler melts Filler metal T m greater than but less than T m of base metal(s) to be joined.  

4. Some filler metals for brazing Base Metal(s) Filler metal(s) Aluminum Aluminum and silicon Nickel-copper alloy Copper Copper Copper and phosphorous Steel, cast iron Copper and zinc Stainless steel Gold and silver

5. Brazing Compared to Welding Any metals can be joined, including dissimilar metals Can be performed quickly and consistently, permitting high production rates Multiple joints can be braze simultaneously Less heat and power Required than Fusion welding Joint areas that are inaccessible by many welding processes can be brazed; capillary action draws molten filler metal into joint

6. Disadvantages and Limitations of Brazing Joint strength is generally less than a welded joint Joint strength is likely to be less than the base metals High service temperatures may weaken a brazed joint Color of brazing metal may not match color of base metal parts, a possible aesthetic disadvantage

7. Brazing Applications Automotive (e.g. Joining tubes and pipes) Electrical equipment (e.g. joining wires and cables) Cutting tools (e.g. brazing cemented carbide inserts to shanks) Jewelry Chemical process industry Plumbing and heating contractors join metal pipes and tubes by brazing Repair and maintenance work

8. S oldering Joining process in which a filler metal with T m less than or equal to 450ᵒC is melted and distributed by capillary action between faying surfaces of metal parts being joined. No melting of base metals, but filler metal wets and combines with base metal to form metallurgical bond. Soldering similar to Brazing, and many of the same heating methods are used. Filler metal called solder. Most closely associated with electrical and electronic assembly.(wire soldering)

9. Soldering Advantages and Disadvantages Advantages : Lower energy than brazing or fusion welding Variety of heating methods available. Good electrical and thermal conductivity in joint. Easy repair and rework. Disadvantages : Low joint strength unless reinforced by mechanically means. Possible weak or melting of joint in elevated temperature service.

10. Filler metals in soldering Usually alloys of tin(Sn) and lead( Pb ).Both metals have low melting temperature. In soldering copper, copper and tin form intermetallic compounds that strengthen bond. Silver and antimony also used in soldering alloys.

11. Summary Brazing and soldering are process that have many great advantages that are often overlooked. They are an excellent process for portable applications and the versatility makes them great choices for many jobs. Their ability to join may different materials with a limited variety of fluxes and filler metals reduces the need for a large inventory of materials.

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