How long does a soldering iron take to heat up?
A 60w soldering iron is a lot of power, but soldering irons usually need to be preheated for 3-5 minutes. Although you look at the hot, and white smoke, but may not have reached the melting point of the solder. Soldering iron preheating time and the use of the environment is also related to the windy environment with low temperature preheating time will be longer, it is recommended that in the low-temperature windy environment to do some protective measures for the soldering iron (such as adding a sleeve) in order to ensure that the soldering iron can continue to polyheat to reach a certain high temperature.
New soldering iron for the first time there will be a little smoke and odor, soldering iron on the head of a layer of antioxidant paint, gently wipe off before use. The first use of the soldering iron to fully feed the soldering iron head, so that its full absorption of tin can be welded.
Soldering iron welding principle
Tin soldering is a science, the principle of soldering iron welding is through the heated soldering iron will solid solder wire heating melting, and then with the help of flux, so that it flows into the metal to be welded between the formation of a solid and reliable welding point after cooling.
When the solder for the tin-lead alloy welding surface for copper, solder first on the welding surface to produce wetting, accompanied by the wetting phenomenon occurs, the solder slowly to the metal copper diffusion, in the solder and the metal copper contact surface to form an adhesion layer, so that the two are firmly combined. So the solder is through the wetting, diffusion and metallurgical bonding of the three physical, chemical processes to complete.
1, wetting: the wetting process refers to the solder has been melted with the help of capillary force along the surface of the base metal and crystalline gaps in the surface of the subtle convex and diffuse around, so that the surface of the base material to be soldered to form a layer of adhesion to the solder and the base metal of the atoms close to each other to reach the distance of the role of the atomic gravitational force.
Cause the environmental conditions of wetting: the surface of the base material to be welded must be clean, there can be no oxides or pollutants.
Image analogy: the water drops to the lotus leaves to form water droplets, that is, the water can not wet the lotus. Drops of water on the cotton, water penetrates into the cotton inside to go, is water can wet cotton.
2, diffusion: accompanied by wetting, solder and base metal metal atoms began to diffuse each other. Usually atoms in the lattice array in the thermal vibration state, once the temperature rises. Atomic activity intensified, so that the molten solder and base metal in the atoms of each other across the contact surface into each other's lattice array, the speed of movement of atoms and the number of decisions on the heating temperature and time.
3, metallurgical bonding: due to mutual diffusion of solder and base material, the formation of an intermediate layer between the two metals - metal compounds, to obtain good solder joints, the soldered base material and solder must be formed between the metal compounds, so that the base material to achieve a solid metallurgical bonding state.
