Low-voltage high-current light-weight spot welding machine

A low-voltage high-current light-weight spot welding machine, comprising:

• a welding power supply device, wherein the welding power supply device comprises a casing, a first electrode and a second electrode, wherein portions of the first electrode and the second electrode extend out of the casing, and the portions of the first electrode and the second electrode extending out of the casing are located at the same side of the casing;
• a movable arm assembly, comprising a movable arm and at least one nut flange, wherein an end of the movable arm is connected with the at least one nut flange, the movable arm assembly is connected with the first electrode via a first conductivity bridge;
• at least one connection block, provided in between the first conductivity bridge and the first electrode, and connected with the first electrode;
• a drive assembly, wherein a drive rod of the drive assembly is connected with the at least one nut flange, the drive rod is configured to drive the movable arm and is located at a bottom portion of the casing, and at least one flange structure is provided on the drive rod;
• a static arm, wherein the static arm is connected with the second electrode via a second conductivity bridge, the static arm is connected with the movable arm via lateral connection plates, the lateral connection plates are connected with the static arm and the at least one connection block via a plurality of bolts, and the lateral connection plates are rotatably connected at the at least one flange structure;
• wherein, by connecting the movable arm assembly, the at least one connection block, the drive assembly and the static arm with the lateral connection plates, a bearing connection mechanism of a welding tong of a spot welding machine is formed and the bearing connection mechanism is integrally connected with the welding power supply device.