Difference Between Soldering Brazing and Welding

Soldering brazing and welding operations are used for joining two or more metal parts. These operations are different in terms of base material to be joined, joining temperature and filler material used.

Welding

Welding is an operation to join two or more similar material by melting base material or by using filler material rod. Strength of welded parts is similar to the base material. Sometimes pressure is also used along with heat to weld parts (for example spot & seam welding).

Welding is relatively done at higher temperatures as compared to brazing and soldering.

Types of Welding

  • Arc Welding
  • GAS Welding
  • Inert Gas Welding (MIG and TIG)
  • Electron Beam
  • Laser Welding
  • Spot / Seam Welding

Brazing

Brazing is an operation to join two or more metal parts by melting and flowing a filler metal into the joint. Filler metal rod always have lower melting temperature compared to base metals. Different metals with considerable strength can be joined with brazing.

This process uses brazing flux and filler rod whereas in welding base material is melted and fused together.

Soldering

Soldering is a joining operation (usually metals) by melting and flowing a filler metal (also known as solder wire) into the joint. Filler metal always have lower melting temperature compared to base metals. Soldering flux is required for doing good quality solder.

Soldering is a low temperature brazing. Gold, silver, copper, brass, and iron metals can be soldered. 

Soldering joint is not as strong as brazed or welding joint. Soldering is commonly used to join electrical components.

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