MULTIARC WELDING OF WELDED BLANKS Russian patent published in 2013 - IPC B23K31/02 B23K9/167 B23K101/18 

FIELD: process engineering.

SUBSTANCE: invention relates to multiarc welding of welded blanks for making car body parts by cold forging. First, current and rate of first arc welding are selected proceeding from penetration into the entire depth of blank and fusion isotherm on blank surface on welding side. Selected are the number of arc, current of every next arc and distance there between so make fusion isotherm width for every arc on blank surface at weld side complies with isotherm width on welding side of every previous arc while arc crater diameters in welding bath are smaller than welding bath fusion isotherms on the side of crystallisation front of welding bath fusion isotherm. First arc electrode is set 65-75° to welding direction while electrodes of the next arcs are set at 105-115° to said direction. Blanks are butt welded at water-cooled appliance in atmosphere of protective gases at constant current and with separate supply of the arcs.

EFFECT: invariable weld seam geometry, smaller area of melted zone of weld joint, hoint plastic structure.

9 dwg