Weld is an evocation spell, It creates an intense flame at the tip of one's finger. This spell is normally used to melt or heat metals. Making forges obsolete to certain people should they wish to smith, Some mages use it in combat though it rarely pays off as one has to be very close for the fire to reach.
Weld can be dangerous as the flame's heat is quite intense. Should one wish to defend against it keeping distance pays off, but warding is a good alternative.