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Welding history

Classification of welding

Effect of welding speed

Welding defects

Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

Welding techniques

Welding symbol

Welding edge preparation

Advantages of welding joints

Thermal properties of metal

Welding safety

Types of welds



Solder Joint

Soldering joint

Solder joint is the process of joining of metals wherein joint is produced by heating to a suitable temperature and used of filler metals having a liquidus temperature not exceeding 4270C and bellow the solidus temperature of base metals. In the solder joint the filler metals are spreads throughout in the properly fitted joint surfaces by the capillary attraction force.

Principle of soldering joints or how to solder:

The following issue should be maintained for the good solder joint.

  1. Selection of right soldering filler material and flux.
  1. Maintaining the proper joint design and clearance.
  1. Sufficient joint surfaces cleanness is required.
  1. For suitable wetting of solder on the base metals the right heating is required in optimum time.
  1. After soldering process it should be left to cooling without disturbance, otherwise during solidification the micro crack formed in the joint.
  1. Properly flux should be applied to the joint surfaces.
  1. After cooling process the flux should be removed from the joint area and surrounding area by proper flux removal process, otherwise it will get catch corrosion in very quickly.

Some lead-tin solders and its chemical composition:

     Sn %          Pb %         Solidus Temperature 0C         Liquidus Temperature 0C


    70               30                        183                                     193

    63               37                        183                                     183

    50               50                        183                                     215

    33               67                        183                                     260

    25               75                        183                                     266

     5                95                        300                                     315

Soldering fluxes:

When heated the base metals and the flux is promoting or accelerating the wetting of metals with solders. The purpose of soldering flux is to removing the oxides and other impurity particles from the soldering surfaces and prevents the re-oxidation during the soldering joint. It is obtained in any solid, liquid or gaseous compound formation.

How to selection of solder joint flux:

The solder joint flux depends on —

  1. The type of solder used.
  1. Type of base metals and its degree of its surface cleanness.
  1. The design of joints.
  1. The process of soldering is used.
  1. After the complete of soldering process the ability to removing the flux residue.

Solder joint method:

There soldering methods are classified in the types of heating applications. The various solder joint methods are—

1. Soldering Iron      2.  Dip and wave     3. Resistance     4.   Furnace ad hot plate   4.  Spray  

 5.  Ultrasonic         6.  Ultrasonic          7.   Condensation    8.  Induction    9.  Torch method.

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Soldering joint