The invention relates to a
welding structure of non-indentation universal arc surface
electric resistance welding. The
welding structure is used for electric resistance
spot welding of an arc surfacestructure of a roof in a high-speed bullet
train and comprises electric resistance
spot welding equipment, and an upper
electrode holding rod and a lower
electrode holding rod are mounted on the upperpart and the lower part of an
operating table of the electric resistance
spot welding equipment correspondingly; the upper end of the lower
electrode holding rod is connected with a universal arc surface lower electrode which comprises a lower electrode universal ball head, an electrode head is arranged on the lower electrode universal ball head, and the lower part of the electrode head is provided with a spherical containing cavity in clearance fit with the electrode universal ball head; and the upper part of the electrode head is provided with an arc
surface plate, and the
radius of the arcsurface plate is consistent with the
radius of the arc surface of the roof in the high-speed bullet
train. A traditional spherical
surface electrode and a
planar electrode are replaced by the universal arc surface lower electrode, the
radian of a lining plate on the top of the lower electrode can be replaced according to the product
radian, the
welding structure is suitable for electric resistance spot welding of products with different radians, the surface has no indentation after welding, the production
processing procedure is simplified, the production efficiency is improved, the requirement for skill of an operator is lowered, and the problems of arc surface attaching and indentation are solved.