Strain

The deformation resulting from a stress.

Strain

Straight-through Lead

A component lead that extends through a hole and is terminated without subsequent forming.

Straight-through Lead

Step-and-repeat

A method by which successive exposures of a single image are made to produce a multiple-image production master.

Step-and-repeat

Step Soldering

The making of solder connections by sequentially using solder alloys with successively lower melting temperatures.

Step Soldering

Statistical Process Control(SPC)

The use of statistical techniques to analyse the outputs of processes with the results guiding actions taken to adjust and/or maintain a state of quality control.

Statistical Process Control(SPC)

Stamped Printed Wiring

Wiring which is produced by die stamping and which is bonded to an insulating base.

Stamped Printed Wiring

Spurious Signal

See Cross-talk.

Spurious Signal

Solidus

The highest temperature at which filler metal(Solder) is completely solid.

Solidus

Solderless Wrap

A method of connecting a solid wire to a square, rectangular, or V-shaped terminal by tightly wrapping the wire around the terminal with a special tool.

Solderless Wrap

Soldering

 A process of joining metallic surfaces with solder, without the melting of the base metals.

Soldering

Soldering Iron Tip

The portion of a soldering iron that is used for the application of the heat that melts the solder.  

Soldering Iron Tip

Solderability

The ability of a metal to be wetted by molten solder.

Solderability

Solderability Testing

The evaluation of a metal to determine its ability to be wetted by solder.

Solderability Testing

Solder Side

The side of a printed board which is opposite to the component side.

Solder Side

Solder Resist

An ink, lacquer, photo-resist or metal coating which is not wetted by molten solder.  It is applied to specific areas of a PCB to stop them from being solder-coated, usually when mass soldering.

Solder Resist

Solder Projection

An undesirable protrusion of solder from a solidified solder joint or coating.

Solder Projection

Solder Plug

A core of solder in a plated through-hole.

Solder Plug

Solder Paste

Finely divided particles of solder, with additives to promote wetting and to control viscosity, tackiness, drying rate, etc.

Solder Paste

Solder oil (Blanket)

Liquid formulations that are used in intermix wave soldering and as coverings on static and wave soldering pots in order to eliminate dross and to reduce surface tension during the soldering process.

Solder oil (Blanket)

Solder Mask, Solder Resist

Coating with mask and insulate areas of a circuit pattern where solder is not desired.

Solder Mask Solder Resist

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