Inverter welder transformer calculations

HELLLO I NEED HELP

I'M MAKING A INVERTRE WELDER
TRANSFORMER DATA:
E 71/33/32 N87

FOR 50V OUTPUT

I HAVE 13 PRIMARY TURNS 0.67mm X 20 WIRES

AND 8 SECONDRY TURNS 0.67mm X 58 WIRES

THE PROBLEMS IS :

THE SECONDRY COIL I WANT TO WIND WITH COPPER FOIL NOT WITH COPPER WIRES

SOO HOW CAN I CALCULATE HOW MANY TURNS OF COPPER FOIL I HAVE TO MAKE??? AND DIMENSIONS OF COPPER FOIL ?? PLEASE HELP
 
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