In order to study the flash butt welding process of the bimetal band saw blade,the movement process of the cam and movable welding platen of the welding mechanism are analyzed. For the different stages of flash butt welding,the cam is divided into different parts,and the change of cam radius driving the movement process of welding electrodes are analyzed. When the welding electrode moves to the upsetting position,the cam displacement mutation obtains the big acceleration,the velocity variable quantity and weld forming process are analyzed. Then,the electrical parameters of welding are sampled,the welding current and voltage waveform are measured,and their change rules are analyzed. Finally,the relationship between the ablation speed of the band saw blade weld and the feed speed of the fixture is obtained combining with the change of the welding electrode movement:When the speeds of these two are consistent,the continuous flash phenomenon appears and the welding quality is better.