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Laser Soldering (1)

ME547-Laser Material Processing
Laser Soldering
What is soldering?
The term soldering denotes thermal processes for joining parts. In contrast to welding, they
work not by melting the parts to be joined, but rather only melting a solder .When the solder
solidifies after removing the heat source, it forms a firm connection with the parts to be joined.
Need for Laser Soldering ?
● Miniaturization of electronic devices and the use of expensive, temperature –sensitive
components used in the electronic equipment industry have led to the demand for laser
soldering technology
● Modern electronic components usually have complex circuit geometries that cannot be
soldered using conventional techniques
What is Laser Soldering?
Laser soldering is a technique where a precisely focused laser beam provides controlled heating of
the solder alloy leading to a fast and non-destructive joint. The process uses a controlled laser
beam to transfer energy to a soldering location where the absorbed energy heats the solder until it
reaches its melting temperature leading to the soldering of the contact and this completely
eliminates any mechanical contact.
Schematic Diagram
Process parameters
● Laser power
● Process time
● Geometry of laser beam.
● Ratio of crown size and through hole.
Advantages of Laser soldering
● Contactless, locally limited application of energy
● Well-controlled energy input,
● Low thermal stress
● It reduces intermetallic compound formation due to rapid joint
formation which results high quality joint.
● It is also has low maintenance
● Very flexible and easily adapted.
Disadvantages of Laser soldering
Limited ability to solder large areas.
high relative price
● Additional cost for safety requirements.
● Extreme non-equilibrium nature.
● Needs precise laser impulse.
● Any slight deviation can lead to an open or destroyed joint.
Soldering profile
Thermal profile control which is different for different joints optimizes soldering
Difference between conventional soldering techniques and
laser soldering.
Iron soldering process
Laser soldering process
Contact heating
Contactless heating
High maintenance
Low maintenance
Heat spreads beyond joint area
Heat is focused on joint area
Long soldering time
Less soldering time
Need for removal of oxide buildup
No compound formation
Industrial applications
Laser soldering is also very important in micro-electronics, where it is used mostly for making
electrical contacts. A single laser pulse can melt the solder to produce a solid connection.Such
techniques are particularly needed where many closely spaced contacts need to be made.
Laser application for soldering permits highly automated production system in the automobile
industry , providing enormous flexibility for a wide variety of fabrication tasks at a very high
processing speed because it is a non-contact technique.
Laser tissue soldering is the process of using laser energy to join tissues without sutures and it is
based on some soldering material ( such as albumin proteins – a biomedical solder) that
coagulates on interaction with a laser beam to form joint .
● https://www.japanunix.com/en/method/laser/
● https://www.intechopen.com/chapters/38865
● https://www.rp-photonics.com/laser_soldering.html
Thank You