METHOD FOR FORMATION OF SPHERICAL CONTACT SURFACE OF BRIDGE STRUCTURE SUPPORT PART Russian patent published in 2010 - IPC E01D22/00 

FIELD: construction.

SUBSTANCE: in method for formation of spherical contact surface of bridge support part, welding is carried out with multiple electrodes to form circular rolls into separate baths with a height that makes it possible to form spherical surfaced of welded layer, and further cavities between applied rolls are filled, at the same time electrodes are moved with the speed determined according to the formula where υ_e - speed of electrodes feed; r_e - electrode radius; r_s - stock radius; υ_w - speed of welding; h - maximum height of welded layer; K_a - allowance for processing; n_e - number of electrodes; n_p - number of welding passes. In process of welding electrodes are used with diametre that increases from stock periphery to its centre. End rolls are applied concentrically with alternating pitch that reduces from stock periphery to the centre. In process of welding electrodes are arranged at the angle of 20-30 to plane of stock placement. Cavities between primarily applied rolls are filled with filler material. Stock of support part is represented by part with flat welded contact surface.

EFFECT: invention eliminates flowing of melted metal from curvilinear surface of shaped ball segment and minimised allowance for further mechanical processing as a result of staged application of melt metal layer onto formed surface.

7 cl, 8 dwg