The invention belongs to the technical field of electric
welding machine supporting devices, and specifically discloses a portable overlapping structure of the secondary bottom line of an electric
welding machine, comprising a connecting rod, a fixing piece is arranged on the outer wall of the connecting rod, a connecting
assembly is arranged at the bottom of the connecting rod, both sides of the connecting
assembly are fixedly connected with a connecting frame, one end of the connecting frame is provided with a fixing
assembly, and two first magnetic blocks are arranged, the two first magnetic blocks are respectively placed on both sides of the connecting assembly and are far away from each other. In
welding work, it is only necessary to fix it to one side edge of the welded object, so that one of the first magnetic blocks is far away from the welding area, and then even if the first magnetic block close to the welding area begins to decay due to the
magnetism contained in the high temperature, the other first magnetic block can still maintain a strong
magnetism to firmly fix the connecting assembly on the welded object, thereby solving the problem that the magnetic block is easily separated from the welded object in the prior art.