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BASIC HAND SOLDERING MULTICORE SOLDER most common type for hand soldering has a composition of Tin (Sn60) and Lead (Pb40), with a diameter of 0.71 mm most.

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Presentation on theme: "BASIC HAND SOLDERING MULTICORE SOLDER most common type for hand soldering has a composition of Tin (Sn60) and Lead (Pb40), with a diameter of 0.71 mm most."— Presentation transcript:

1 BASIC HAND SOLDERING MULTICORE SOLDER most common type for hand soldering has a composition of Tin (Sn60) and Lead (Pb40), with a diameter of 0.71 mm most common type for hand soldering has a composition of Tin (Sn60) and Lead (Pb40), with a diameter of 0.71 mm contains internal core of non- corrosive Rosin Mildly Activated (RMA) flux contains internal core of non- corrosive Rosin Mildly Activated (RMA) flux has a plastic stage between the melting and solidifying stages has a plastic stage between the melting and solidifying stages

2 Dry joints are caused through: Dry joints are caused through: movement of joint during plastic stage movement of joint during plastic stage thermal stress thermal stress PCB contamination PCB contamination oxidisation oxidisation BASIC HAND SOLDERING

3 TIPS appropriate size and width is determined by the size of the connection to be made appropriate size and width is determined by the size of the connection to be made ideally 2/3 to equal the diameter of the pad ideally 2/3 to equal the diameter of the pad tips should be correctly 'tinned at all times, by adding a small amount of solder to the hot tip tips should be correctly 'tinned at all times, by adding a small amount of solder to the hot tip BASIC HAND SOLDERING

4 LEAD FORMING minimum distance from the end of the component body to the start of the lead bend is usually 2 lead diameters or 1.5mm for hand bending methods minimum distance from the end of the component body to the start of the lead bend is usually 2 lead diameters or 1.5mm for hand bending methods without undue pressure hold the component lead with the pliers and bend the lead protruding beyond the pliers with a finger until a 90 degree angle is formed. without undue pressure hold the component lead with the pliers and bend the lead protruding beyond the pliers with a finger until a 90 degree angle is formed. if damaged discard component if damaged discard component BASIC HAND SOLDERING

5 COMPONENT MOUNTING Radial leaded loaded slightly off the PCB ( mm) Radial leaded loaded slightly off the PCB ( mm) Axial-leaded loaded with the body of the component very close to the PCB ( mm) Axial-leaded loaded with the body of the component very close to the PCB ( mm) BASIC HAND SOLDERING

6 BENDING AND MOUNTING OF COMPONENTS mounted centrally between the holes mounted centrally between the holes resistors mounted so colour code orientated in the same direction resistors mounted so colour code orientated in the same direction polarised components should be orientated so that polarity symbols (+ or - ) and component value are visible polarised components should be orientated so that polarity symbols (+ or - ) and component value are visible BASIC HAND SOLDERING

7 LEAD TERMINATIONS TYPE 1 FULLY CLINCHED – bend the lead flat against the pad bend the lead flat against the pad trim the lead to a length of between 1- 2 lead diameters trim the lead to a length of between 1- 2 lead diameters Used in High Quality/High Reliability military or life support applications Used in High Quality/High Reliability military or life support applications difficult to rework difficult to rework TYPE 2 SEMI-CLINCHED – bend the lead to an angle of approx. 45 bend the lead to an angle of approx. 45 Cut to a minimum of 0.5mm and a max. of 1.5mm, or between 1-2 lead diameters Cut to a minimum of 0.5mm and a max. of 1.5mm, or between 1-2 lead diameters Used for commercial applications Used for commercial applications ease of de-soldering ease of de-soldering TYPE 3 RIGID LEAD TERMINATION – straight through termination straight through termination Cut to a length of min. 0.5mm and max. of 1.5mm, or between 1-2 lead diameters Cut to a length of min. 0.5mm and max. of 1.5mm, or between 1-2 lead diameters BASIC HAND SOLDERING

8 CONSTRUCTING A GOOD SOLDER JOINT Figure a) the amount of solder applied is minimal and may result in a poor electrical connection over time. Figure a) the amount of solder applied is minimal and may result in a poor electrical connection over time. Figure b) shows the optimal solder joint that has good wetting between component lead and PCB pad. Figure b) shows the optimal solder joint that has good wetting between component lead and PCB pad. Figure c) indicates an excessive amount of solder has been applied to the connection. Figure c) indicates an excessive amount of solder has been applied to the connection. BASIC HAND SOLDERING

9 CLEANING a process of removing contaminates before and after soldering ensures good mechanical/electrical connection Three different methods Three different methods: Mechanical - scourer or bristle brush Chemical - solvents eg. Isopropyl Alcohol Thermal - solder pot BASIC HAND SOLDERING

10 BASIC SOLDERING PROCEDURE iron temperature is set at approx. 350 iron temperature is set at approx. 350 soldering iron tip size is suitable soldering iron tip size is suitable solder sponge is damp solder sponge is damp tip is clean and shiny (wipe & tin) tip is clean and shiny (wipe & tin) Apply flux (RMA) to help wetting if necessary Apply flux (RMA) to help wetting if necessary soldering iron at a 45 angle soldering iron at a 45 angle BASIC HAND SOLDERING

11 BASIC SOLDERING PROCEDURE heat the lead and the pad simultaneously heat the lead and the pad simultaneously flowing solder around the joint forms a heat bridge flowing solder around the joint forms a heat bridge remove soldering iron and solder simultaneously (prevents spiking) remove soldering iron and solder simultaneously (prevents spiking) clean the PCB with Isopropyl Alcohol and a bristle brush clean the PCB with Isopropyl Alcohol and a bristle brush wipe or pat dry with a lint free tissue to remove traces of residue. wipe or pat dry with a lint free tissue to remove traces of residue. BASIC HAND SOLDERING

12 Use appropriate safety equipment fume extractors fume extractors hand cleaners hand cleaners goggles goggles READY TO SOLDER BASIC HAND SOLDERING


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