说明：  延长烙铁头寿命的方法值得研究，从不同的侧面和管控点来介绍烙铁头的构造
(This Technical Note discusses the construction of solder tips, the various failure modes associated with tip plating (cracking, wear, corrosion, and dewetting), how to diagnose those failure modes, and specific practices that can be taken to minimize or eliminate each one. In addition, care practices specific to Metcal and OKi tips and tip cartridges are given)