Water flowing channel welding device and electrode limiting and guide tool thereof

The utility model provides an electrode limiting and guide tool which comprises a limiting and guide mechanism and a mounting mechanism. The limiting and guide mechanism is provided with an abutting face abutting against the edge of a workpiece, and the limiting and guide mechanism can be fixedly arranged on a first electrode cap or a second electrode cap which is coaxially and oppositely arranged on an electric resistance welding device through the mounting mechanism. When the tool is used, due to the fact that a guide rod abuts against the edge of a water flowing channel, the position of a lower electrode is limited at the position, the position of the lower electrode is an accurate position matched with a welding point at this moment, an upper electrode cap and a lower electrode cap are coaxially connected, the position of the upper electrode cap can be naturally determined along with the lower electrode cap after the position of the lower electrode cap is determined, and therefore the upper electrode cap