METHOD OF ASSEMBLING FOR WELDING ANNULAR BUTTS OF TANKS AND APPARATUS FOR PERFORMING THE SAME Russian patent published in 2006 - IPC B23K37/04 

FIELD: assembling for welding annular butts of tanks of aluminum alloys, corrosion resistant steels, possibly in aerospace, aviation, transport vehicle making and chemical industry branches.

SUBSTANCE: method comprises steps of making shells and bottoms; heating edges of welded parts by means of outer flexible heating member and freely putting heated-edge parts onto backing ring assembled outside tank. Diameter of backing ring exceeds diameter of welded parts in order to provide desired installation gap at heating parts and guaranteed tightness between backing ring and welded parts at cooling. Separate parts of backing ring are joined one to other without gaps by means of cone bolt joints. Contact surfaces of separate parts are inclined relative to ring plane in order to provide free detaching of ring parts at dismounting it. Then heating member is turned off and assembled unit is cooled till 20°C. Annular butt is welded and backing ring is removed.

EFFECT: simplified procedure of assembling due to reliable and simple design of apparatus used for assembling at welding while providing complete contact between welded parts.

4 cl, 9 dwg, 1 ex