The invention provides a tailor
welding method for a hydraulic support push rod with a liquid supply and
return function. A push rod comprises a cover plate, a middle plate, a bottom plate and a liquid supply and return mechanism, before a connector base and a liquid passing
pipe are welded, before the connector base and the middle plate are welded and before the connector base and the cover plate are welded, a
metal plug is installed in a liquid passing hole of the connector base firstly, the
metal plug is formed by
machining round steel, the
metal plug comprises a blocking cover, a plug body and an external thread section which are sequentially connected from top to bottom, the
diameter of the blocking cover is larger than the inner
diameter of the liquid passing hole, the
diameter of the plug body is less than the inner diameter of the liquid passing hole by 2 millimeters, an annular groove is formed in the connecting position of the plug body and the external thread section, internal threads matching with each other are arranged at the position, corresponding to the external thread section, of the deep position of the liquid passing hole, and the number of threads of the external thread section is not larger than 3. The tailor
welding method for the hydraulic support push rod with the liquid supply and
return function has the advantages of being scientific in design, not prone to deformation, high in product reliability and long in service life.