Memorial day is 05/25/2015 – Orders will ship out on May 26th. There will not be any deliveries or shipping on Monday. Any order placed after 11am ET on Friday May 22nd will not start to ship out until Tuesday May 26th.
The tip needs to be substantially hotter than the melting point of the solder in order to heat the whole joint to melting temperature quickly. If it takes too long to make the joint, the components themselves can overheat to the point of damage.