15 - Friction, brazing, and soldering

This set of flashcards covers key concepts and processes related to various welding techniques, specifically resistance welding, solid-state welding, and brazing, as described in the lecture notes.

Resistance Welding

A welding process that uses electrical resistance heating to form the joint by combining heat and pressure.

Coalescence

The process of joining two materials together, occurring at lower temperatures in resistance welding compared to oxyfuel welding.

Electrical Resistance Formula

H = I²Rt, where H is total heat input in joules, I is current in amperes, R is electrical resistance in ohms, and t is time in seconds.

Contact Resistance

The opposition to current flow at the interface between the electrodes and workpieces in resistance welding.

Resistance Spot Welding (RSW)

A widely used form of resistance welding that joins overlapped materials quickly and economically.

Heat-Affected Zone (HAZ)

The area of base metal that is affected by the heat from the welding process.

Projection Welding

A resistance welding process that uses projections on the workpieces to minimize the need for special equipment and ensure good surface appearance.

Friction Welding (FRW)

A solid-state welding process that generates heat through mechanical friction between the workpieces.

Friction-Stir Welding

A solid-state welding method involving a rotating probe that generates frictional heat to join materials.

Brazing

A process for joining similar or dissimilar metals using heat and a filler metal that has a melting temperature above 450°C but below the melting point of the joined materials.

Butt Joint

A joint configuration where two workpieces are aligned edge-to-edge.

Solid-State Welding

Welding processes that create joints without melting the workpiece or filler material.

Soldering

A process of joining metals together with a filler metal that has a melting point lower than that of the workpieces.