Recrystallization temperature

The recrystallization temperature is the limit from which a cold-formed structure reforms and becomes softer. In welding, it's the point where heat changes the structure so that hardness and strength can decrease. This mainly happens in the heat-affected zone when you put in too much energy or the interpass temperature gets too high. Pure metals react more sensitively than alloyed steels, which withstand higher temperatures. Keep the heat input as low as possible and know the limits of your material, then you'll avoid coarse structures and cracks.