heat-affected zone

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heat-affected zone

[′hēt ə¦fek·təd ′zōn]
(metallurgy)
The zone within a base metal that undergoes structural changes but does not melt during welding, cutting, or brazing.
References in periodicals archive ?
Observed quality characteristics are top kerf width, heat affected zone (HAZ), surface roughness and dross formed at bottom side.
A wider heat affected zone has been associated with a more random-fiber orientation in the weld melt-film, increasing the probability of fiber orientation perpendicular to the weld plane, and also diffusion of fibers across the weld interface (73).
Melting zone formed by Fe3C M and Ar, and the heat affected zone formed by graphite, M and Ar composition;
In this case, the impact toughness of the metal in the heat affected zone was more than 10% higher than the value in our the zones.
By the late 1990's it was becoming better understood that creep damage in seam welds did not initiate as distinctive crack-like flaws, but rather as an accumulation of microstructural damage evidenced by "cavitation" development around inclusions and carbides along the grain boundaries in the heat affected zone or fusion zone of the seam weld (depending on whether the structure was normalized and tempered or subcritically annealed after welding).
Minimized distortion, heat affected zone compared to spray transfer
If the heat affected zone is too large, the question of insufficient pressure applied during the seal phase is considered with similar poor weld results.
The company said the reduced heat affected zone of MagneGas compared to acetylene makes it safer for human life during extractions, which is a critical benefit of MagneGas fuel for these markets.
The metallurgy of the 7025 Al-alloy is studied in the fusion zone, partially melted zone and the heat affected zone.
The heat affected zone was then cooled down under room temperature.
The MicroMaster features patented ultra-short pulse length excimer-laser technology for cuts, holes, and patterns with sub-micron precision, minimal debris, and minimal heat affected zone.