METHOD OF CONTACT SPOT WELDING OF FLAT ITEM MADE OF SHEET MATERIAL TO METAL ROD OF CYLINDRICAL SHAPE Russian patent published in 2009 - IPC B23K11/10 B23K11/14 B23K101/00 

FIELD: technological processes.

SUBSTANCE: invention is related to the field of contact welding and may be used in machine buildings and other industries for manufacture of parts with overlapping welded joint, which comprises flat part with welded rod of cylindrical section. Slots are arranged in flat part with creation of links between them. Number of slots is less by one that welding dots, number of which is determined from the following condition: E_slot < nF_dot, where n is number of welding dots, F_slot is force acting at welded joint, F_dot is minimum force of destruction at welding dot cut, based on thickness and metal of welded flat part. Slots are arranged as longitudinal, in direction perpendicular to axis of rod installation, with width of 2÷10 mm and length defined from the following condition L > t₃, mm, where t₃ is minimum pitch between welding dots with account of welding flux shunting to previous dot. Flat part is installed on lower electrode arranged with contact surface equal to width of link b₁, which is based on the following condition: b₁=[d_n+(1÷5)], mm, where d_n is diametre of welding dot cast nucleus. Rod is placed onto flat part, and welding is carried out.

EFFECT: improved strength and quality of welded joint, reduced length of welded parts overlapping, reduced power consumption and lower metal intensity of welded parts.

2 dwg, 2 tbl, 2 ex