When the use of thermostat welding word treasure to preheat, preheat to the vent after smoke to welding, soldering iron tip position and the location of the welding must be viscous dilute hydrochloric acid or solder, so that the welding will be strong , High-power heating core is to ensure that the heat to ensure a solid weld, and copper must be copper, and only copper can be linked to the tin can be welded when the middle of a pause, you can lower the electric iron regulator, This temperature will not drop, it will not dry, to ensure the life of the iron