Joining device and joining method

A joining device for joining a metal member and a resin member using a metal fastener that penetrates the resin member and fuses to the metal member, the metal fastener including a tip, and the joining device comprises:

• a cylindrical nose piece operable for up and down movement;
• a high-frequency induction heating coil disposed around the nose piece;
• an electrode punch operable for up and down movement inside of the nose piece and for conducting a welding current;
• a high frequency electronic chopper device operable for converting an input power into one of a welding current and an induction heating current;
• a high-frequency induction output device operable for receiving the induction current from the chopper device, and for supplying the induction current to the high-frequency induction heating coil;
• a resistance welding output device operable for receiving welding current from the chopper device and supplying welding current between the electrode punch and the metal member;
• a contact sensing device operable for sensing when the tip portion of the fastener has penetrated the resin member and contacted the metal member;
• and
• a switching device operable for switching between connecting the chopper device to one of either the high-frequency induction output device or the resistance welding output device based on an output signal from the contact sensing device.