METHOD FOR MAKING LARGE-SIZE CLAD SHEETS Russian patent published in 2004 - IPC

FIELD: manufacture of fluid-tight welded asymmetrical packs. SUBSTANCE: method comprises steps of welding pack along its perimeter after preparing contact surfaces and assembling asymmetrical pack of base metal and cladding layer; then performing evacuation and hot rolling; before welding pack along perimeter realizing manual electric arc welding of sublayer; blowing off pack with inert gas and performing preliminary evacuation; after welding pack along perimeter and evacuation of it, placing pack and heating for rolling pack while retaining cladding layer; combining heating for rolling and tempering of welded joint of pack; before welding assembling pack with gap no more than 0.5 mm between cladding layer and base metal. EFFECT: enhanced quality of clad sheets, increased yield of bimetal. 2 cl, 2 dwg, 1 tbl