Simple welding device for precious metal thermocouple

The simple welding device comprises a transformer, a welding switch and two carbon rod electrodes, a primary side coil of the transformer is connected with an alternating current power supply through a cable, the head end of a secondary side coil is connected with one carbon rod electrode through a wire, and the other end of the secondary side coil is connected with the other carbon rod electrode through a wire. The other carbon rod electrode is connected with the tail end of the secondary side coil of the transformer through a wire and a welding switch in sequence, and a thermocouple wire to be welded is placed at an electric arc generated between the two carbon rod electrodes. According to the utility model, the thermocouple wire is melted through high temperature instantly generated by short circuit of the carbon rod electrode by utilizing fixed alternating voltage, so that the purpose of welding the thermocouple wire is achieved. The device has the advantages of being simple in structure, small in size, c