NOVELTY - The welding machine comprises a pharynx heater for heating up a bus bar ribbon and string cell ribbon using a soldering iron tip, a hot air showerhead arranged in one side of the soldering iron tip for spraying hot air on the soldering iron tip. The hot air showerhead comprises an air heater for heating up the injected air. An air nozzle is set in one side of the air heater for sprays the heated air to the soldering iron tip. The air nozzle comprises a nozzle hole that is formed in a box type nozzle body. A holder body with a holder is connected to a side of the air heater.    USE - The welding machine is useful for bushing a solar cell module (claimed).    ADVANTAGE - The cost-effective machine prevents damage of the soldering iron tip during spraying the hot air thus increasing the durability of the welding tip.    DETAILED DESCRIPTION - The welding machine comprises a pharynx heater for heating up a bus bar ribbon and string cell ribbon using a soldering iron tip, a hot air showerhead arranged in one side of the soldering iron tip for spraying hot air on the soldering iron tip. The hot air showerhead comprises an air heater for heating up the injected air. An air nozzle is set in one side of the air heater for sprays the heated air to the soldering iron tip. The air nozzle comprises a nozzle hole that is formed in a box type nozzle body. A pair of plates is arranged along intervals in a partition. A holder body with a holder is connected to a side of the air heater. A connection bracket is extended in the holder body. A fixed bracket is fixed to the connection bracket. An air input part is connected to a side of the air heater for injecting the air. A power applying part is connected to the side of the air heater for supplying power to the air heater. The temperature of the soldering iron tip is 200-300 degrees C. The temperature of air emitted from the shower head is 600-700 degrees C. An INDEPENDENT CLAIM is included for a solar cell module welding method.