Abstract: The invention provides a portable welding or cutting shield to assist in preventing welding or burning by-products from contaminating or damaging the inside surfaces of a pipe. The portable welding shield comprises a shield assembly for capturing the by-products released within and traveling along the length of the pipe, a leg assembly for supporting the shield assembly within the pipe and a splatter target that extends upwardly from the shield assembly. The leg assembly includes fixed first and second legs, and an adjustable third leg. The adjustable leg includes a screw actuator that allows the length of the leg to be radially adjusted so as to allow the leg assembly to be brought in and out of engagement with the inside diameter of the pipe. The shield assembly includes multiple flexible pieces of flame resistant fabric sandwiched between a top and a bottom pair of semi-circular plates.