Patent ID: 6896024

Claim:
A thermo-welding device for fixing a fixed object to a molded good, by inserting a welded boss formed on a molded good and made of thermoplastic resin into a fixing hole formed on the fixed object, heating and fusing a tip section of the welding boss projecting out from the fixing hole performing an expanded section outside of the fixed object, the welding device comprising: a heating element having a periphery having an applying side with a shaped section for application to the welding boss of the molded good and for heating and fusing the welding boss, a portion of the periphery having a slit for discharging air from the inside of the heating element to outside of the heating element after the air is used for cooling; and a pipe for supplying cooling air into the inside of the heating element, said pipe having a lengthwise hole for blowing air onto a back of the applying side of said periphery of the heating element and said pipe having a widthwise hole for blowing air onto an internal surface of the heating element, said widthwise hole being in a shifted position at an angle not facing said slit.