The operation in which two or more metal parts are joined together using high-intensity heat is welding.
Welding involves melting the base metals and adding filler material to create a strong joint when cooled.
Draw the pattern of the magnetic field lines for the two parallel straight conductors carrying current of same magnitude 'I' in opposite directions as shown. Show the direction of magnetic field at a point O which is equidistant from the two conductors. (Consider that the conductors are inserted normal to the plane of a rectangular cardboard.)