For a welding operation of two carbon steel plates in a T-joint with a welding speed of 20 mm/sec, a DC voltage supply of 12 V, and a weld width of 2.5 mm, the cross-sectional area of the weld joint is A = 0.5*b*h, where b is the base and h is the height of the triangular cross-section of the weld and both are equal to the weld width. What current level needs to be supplied?