Welding Processes and Material Characteristics

Flashcards about welding processes and material characteristics during welding.

Friction Welding (FRW)

Heat is generated from sliding friction between two surfaces; bonding occurs in solid-state; no melting

Fusion Welding

Materials are melted and fused together, involving base and filler metals; rapid cooling affects microstructure

Fusion Joint Characteristics

Inhomogeneous; complexity increases with alloy composition; greater heat intensity results in deeper penetration and lower residual stresses

Welding of Single-Phase Materials

Welding rod and some base metal melt to form the weld bead; high heat exposure alters structure and properties in the Heat-Affected Zone (HAZ)

Welding of Two-Phase Materials

Most engineering alloys are two-phase or multiphase; precipitation-hardening alloys can be welded in annealed, solution-treated, or aged states; heat treatment benefits are lost in the weld zone

Solid-State Phase Transformations During Welding

Cause complex changes in microstructure; parent metal may consist of pearlite and ferrite grains; weld zone forms a coarse, cast-like structure