The invention relates to a method for the position- and angle-compensated welding of a component (6) to a base body (5), in particular to a blow molding, comprising the working steps of three-dimensionally recording the geometrical and positional data of the joining face (51) of the base body (5), positioning at least one heating element (221) on the basis of the recorded geometrical and positional data in such a way that a constant distance between the heating element (221) and the joining face (51) of the base body (5) is achieved over the entire joining face (51), plastifying the joining faces (51, 61) of the base element (5) and the component (6) and bringing the plastified joining faces (51, 61) of the component (6) and the base body (5) together. The invention also relates to a device for carrying out the method for the position- and angle-compensated welding of a component (6) to a base body (5), comprising at least one heating element (221) and means for positioning (2) the at least one heating element (221), means (3) for positioning the base body (5), means for positioning the component, means (23) for recording geometrical and positional data of a body (5) and also a control unit (4), wherein the means (2) for positioning the at least one heating element (221), the means (3) for positioning the base body (3) and the means (2) for positioning the component (6) act together under the control of the control unit (4) in such a way that a uniform distance between the at least one heating element (221) and the joining face (51) of the base body (5) can be achieved over the entire joining face (51) on the basis of the geometrical and positional data.