Abstract: A modular welding fixture apparatus for positioning a workpiece. The fixture includes a base table having an array of openings through the surface and an array of locator mounting holes co-located in a spaced relationship with respect to the openings to accommodate at least one vertical end locator having a base plate that is removably mountable to the base table at preselected positions thereon, and the locator has means for locating and holding at least a portion of a workpiece. The fixture further includes at least one horizontal locator having a base plate that is removably mountable to the base table at preselected positions thereon, and the base plate having means for locating and holding at least a portion of a workpiece.An alternative embodiment includes a rotatable base plate and a rotatable front plate to allow greater flexibility in the positioning of workpieces at various angles with respect to the base table.