| 摘要 |
PURPOSE: A nitrogen gas injection device for welding a copper pipe is provided to easily perform the welding work of a copper pipe by enabling a worker to control the inflow of nitrogen gas. CONSTITUTION: A nitrogen gas injection device for welding a copper pipe comprises a connection pipe(1), a valve unit, and an operation unit. The connection pipe is screwed on the inlet of a nitrogen gas tank(T). The valve unit cuts off nitrogen gas or allows nitrogen gas to flow into the connection pipe. The operation unit is composed of a radio remote controller(5) and a radio receiver(6). A worker operates the valve unit through the operation unit at a welding work position.
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