Some dedicated 3D conversion programs should be capable of helping you with obj to igs conversion, i.e. conversion of 3D object graphics (.obj) to IGES 3D exchange format (.igs). Typically used to transform 3D models from one format to another, between two somewhat generic and exchange data formats.
Open OBJ file Open IGS file3D viewer and converter with huge file type support
A CAD viewer program with conversion capabilities
A set of 3D modeling tools
A converter for 3D formats
3D CAD/CAM tool for product development
A CAD converter with huge format support
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
A 3D CAD translation software
A dedicated CAD converter