Device for overlap welding of DOC carrier and POC carrier on catalyst assembly

The utility model relates to a device for overlap welding of a DOC carrier and a POC carrier on a catalyst assembly. The device comprises a supporting frame, a welding machine and a switch pedal. The supporting frame is provided with a base and a supporting rod, a welding gun is fixed to the supporting rod, the base is arranged on the supporting frame through a bearing, a gun opening of the welding gun corresponds to the base, and the welding gun and the switch pedal are connected with the welding machine. When the device is used, the end, wherein overlap welding is not needed, of the POC carrier is fixed to the base, the bottom end of the cylindrical POC carrier is exactly clamped to a positioning groove, then the end, where overlap welding is needed, of the DOC carrier is arranged on the overlap welding end of the POC carrier, then the carriers are held by the two hands, the foot is used for treading the switch pedal to start the welding machine, the welding gun begins to conduct overlap welding on one point, and then the switch pedal is released; due to the fact that the base is arranged on the supporting frame through the bearing, the carriers are held by the two hands and rotated by an angle, and welding is conducted on a next welding point. The device saves time and labor in the overlap welding process and improves the welding efficiency.