Disclosed are a ceramic electric heating element having a two-layer structure, and an electric soldering iron. The electric heating element having a two-layer ceramic structure comprises an inner conducting layer and an outer insulating layer; the insulating layer wraps the conducting layer, and the conducting layer is exposed outside the insulating layer at the head and tail of the electric heating element. In addition, the ceramic electric heating element having a two-layer structure is used to the electric soldering iron. The present invention allows the miniaturization in the manufacture of ceramic electric heating bodies, with low production cost and low difficulty in respect of the process.

A heater-sensor complex 10 includes a heating wire 12, a lead wire 14 which is made from the same metal of the heating wire 12 and connected to the proximal end of the heating wire 12, the lead wire 14 having a bigger diameter than the heating wire 12, a non-heating wire 16 constituted by a different metal from the metal constituting the heating wire 12, and a sensor head 18 constituted by a metal different from the metal constituting the heating wire 12 or the metal constituting the non-heating wire 16. The sensor head 18 have a lower thermal conductivity than the non-heating wire. To the sensor head 18, the distal end of the heating wire 12 and the distal end of the non-heating wire is connected. The heating wire 12 and the non-heating wire 16 electrically conducts at least through the sensor head 18.

An electric heating device includes a body and a heating head connected to the body. The heating head includes an electric heating wire and a heat storage member. The electric heating wire includes a first section and a second section connected to the first section. The first section is made of pure nickel. The second section is made of ferrochrome. The heat storage member is mounted around an outer radial periphery of the second section. The heat storage member is made of porcelain clay. The electric heating wire is connected by sections of three different materials so that the heating head can be raised to a very high temperature with extremely high heat generation efficiency, and the electric heating device is not easily damaged by high temperature.

A soldering tool may include a power unit including a controller, a tool body configured to interface with the power unit, and a tip portion operably coupled to the tool body. The tip portion may include a tip that is heated to melt solder by a heating element controlled by the controller. The tip is operably coupled to the heating element via a braze joint. The heating element may be operable at a first temperature range for melting the solder and a second temperature range, higher than the first temperature range, to facilitate forming or braking the braze joint.

A soldering iron system with automatic variable temperature control comprising a hand piece or robot arm including a soldering cartridge having a soldering tip, a coil that generates a magnetic field, and a temperature sensor for sensing a temperature of the soldering tip; a variable power supply for delivering variable power to the coil to heat the soldering tip; a processor including associated circuits for accepting a set temperature input and the sensed temperature of the soldering tip, and providing a control signal to control the variable power supply to deliver a suitable power to the coil to keep the temperature of the soldering tip at a substantially constant level of the set temperature input.

An intelligent soldering handpiece comprising a housing; a solder tip; a heater for heating the solder tip; a processor for receiving an image of a solder joint being soldered by the intelligent soldering handpiece, determining solder joint information, and associating the image of the solder joint with the determined solder joint information to distinguish the determined solder joint information for each respective joint.

A soldering iron system with automatic variable temperature control comprising a hand piece or robot arm including a soldering cartridge having a soldering tip, a coil that generates a magnetic field, and a temperature sensor for sensing a temperature of the soldering tip; a variable power supply for delivering variable power to the coil to heat the soldering tip; a processor including associated circuits for accepting a set temperature input and the sensed temperature of the soldering tip, and providing a control signal to control the variable power supply to deliver a suitable power to the coil to keep the temperature of the soldering tip at a substantially constant level of the set temperature input.

A soldering iron system with automatic variable temperature control comprising a hand piece or robot arm including a soldering cartridge having a soldering tip, a coil that generates a magnetic field, and a temperature sensor for sensing a temperature of the soldering tip; a variable power supply for delivering variable power to the coil to heat the soldering tip; a processor including associated circuits for accepting a set temperature input and the sensed temperature of the soldering tip, and providing a control signal to control the variable power supply to deliver a suitable power to the coil to keep the temperature of the soldering tip at a substantially constant level of the set temperature input.

An electric heating device includes a body and a heating head connected to the body. The heating head includes an electric heating wire and a heat storage member. The electric heating wire includes a first section and a second section connected to the first section. The first section is made of pure nickel. The second section is made of ferrochrome. The heat storage member is mounted around an outer radial periphery of the second section. The heat storage member is made of porcelain clay. The electric heating wire is connected by sections of three different materials so that the heating head can be raised to a very high temperature with extremely high heat generation efficiency, and the electric heating device is not easily damaged by high temperature.

A heater-sensor complex 10 includes a heating wire 12, a lead wire 14 which is made from the same metal of the heating wire 12 and connected to the proximal end of the heating wire 12, the lead wire 14 having a bigger diameter than the heating wire 12, a non-heating wire 16 constituted by a different metal from the metal constituting the heating wire 12, and a sensor head 18 constituted by a metal different from the metal constituting the heating wire 12 or the metal constituting the non-heating wire 16. The sensor head 18 have a lower thermal conductivity than the non-heating wire. To the sensor head 18, the distal end of the heating wire 12 and the distal end of the non-heating wire is connected. The heating wire 12 and the non-heating wire 16 electrically conducts at least through the sensor head 18.