Welding device and welding method for rotating shaft and end plate of rolling barrel pepper stem cutting machine

The invention discloses a welding device for a rotating shaft and an end plate of a pepper stem cutting machine. The welding device comprises a bottom frame. An annular frame is arranged at the upperend of the bottom frame. Three sliding plate guide grooves uniformly distributed in the circumferential direction are formed in the annular frame. An end plate centering mechanism is arranged in one sliding plate guide groove and comprises sliding plates. The sliding plates are slidably arranged on the sliding plate guide groove and are provided with inclined holes which are oblique outwards. Electric rotating tables are fixed to the annular frame and are used for fixing column pins. The column pins slide in the sliding plate guide grooves. The sliding plates are used for fixing centering frames. The centering frames are rotatably provided with end plate entering and upper and lower side clamping mechanisms. The clamping mechanisms rotatably support the end plate. A rotating driving mechanism is fixed to the botto