Tack weld the pieces into position, either with tacking rod, laid in 1 inch beads spaced along the length of
the joint, or by use of the tacker tip, in which case the two pieces will he tacked together along the entire
length. Start several inches from the corner, as it is nearly impossible to start a weld satisfactorily in the
confines of the corner. Lay the root bead at the junction of the sides and bottom, running it continuously
past the corner on a horizontal plane. When the vertical weld is run, make sure it overlaps the horizontal
weld, giving maximum strength to the joint, and forming a positive seal. In making tanks, it is preferable to
form the corners, and weld on the flats. Where this is not feasible, the inside corner weld is the preferred
technique. Because welds in tanks are subjected to considerable pressure, the fusion of the rod and base
material must be complete.