An L 200×150×20 steel angle is to be welded to a flat plate with the long side of the angle against the plate as shown in Figure.
Determine the minimum lengths L1 and L2 that will cause the angle to carry the maximum allowable axial load. The allowable tensile stress for the material in the angle is 124 MPa, and the allowable shearing stress in the weld material is 94 MPa. Each leg of the weld is 15mm.