Present invention provides a universal fixture that fits a broad range of flange/pipe sizes, covering the common sized 4-hole to 24-hole flanges. The present invention solves the end play issue (between the mounting studs and the screw holes of the flange) by aligning the centers of the flange to the center of the pipe, relying on the center hole of the OH plate. An additional accessory can be used to set adjustable height support, for propping up pipes and balance the weight, facilitating the ease of handling the welding work.