■ Type I (pointed) characteristics: the tip of the tip of the soldering iron is thin.
■ Type B (conical) features: the entire tip of the soldering iron tip can be soldered.
■ D-type (one word batch nozzle shape) features: Welding with the batch nozzle portion.
■ Type C (horseshoe-shaped) features: Welding with the beveled portion of the tip of the soldering iron tip.
■ K type (knife shape) characteristics: vertical or pull welding can be used.