Method for producing a T-shaped profile connection for a frame of a window and/or a door, in which a first and a second plastics material frame profile (1, 2) are welded to each other so as to continue one another in a straight line and at right-angles thereto a plastics material transom profile is fitted in the transition region between the first and second frame profiles (1, 2), wherein the first and second frame profiles (1, 2) each have a front-side and rear-side visible surface (11, 14; 21, 24), an overlap visible surface (12, 22) and an overlap chamber (10, 20) which is delimited by the front-side visible surface (11, 21) and the overlap visible surface and are welded to each other in such a manner that the front-side visible surface of the second frame profile is located in a plane with the rear-side visible surface of the first frame profile and the transom profile has a substantially z-shaped cross-section with at least one central chamber and two overlap chambers (31, 32) which adjoin the overlap chambers (10, 20) of the first and second frame profiles (1, 2) and which are each delimited by a transom visible surface (33, 34) which covers the central chamber and the overlap chamber (31, 32) and an overlap visible surface (35, 38), characterised by the operating steps: a) the transom profile in the region of the end thereof which is intended to be connected is adapted to the contour of the first frame profile and/or second frame profile; b) the overlap chamber of the second frame profile in the region of the end thereof which is intended to be welded is notched in accordance with the facing overlap visible surface of the transom profile; or the overlap chamber of the transom profile adjacent to the overlap chamber of the second frame profile in the region of the end thereof which is intended to be welded is notched in accordance with the facing overlap visible surface of the second frame profile; c) the first and second frame profiles (1, 2) at the facing end faces thereof at least in a part-region of the end faces thereof are welded to each other with at least one joint (T, T1) being formed; d) the transom profile is connected with the end thereof on the first frame profile and/or the second frame profile in the region of the joint (T, T1); wherein the sequence of at least the operating steps a) and b) is not significant and wherein at the transition of the front-side visible surface of the first frame profile to the rear-side visible surface of the second frame profile a first joint which extends perpendicularly to the longitudinal extent of the two frame profiles (1, 2) is formed and at the transition of the rear-side visible surface of the first frame profile to the front-side visible surface of the second frame profile a second joint which extends perpendicularly to the longitudinal extent of the two frame profiles (1, 2) is formed, wherein the first and second joints (T, T1) when viewed in the longitudinal direction of the first and second frame profiles (1, 2) have an offset and the longitudinal edge of the transom visible surface located remote from the overlap chamber is in alignment with the first joint and the longitudinal edge of the transom visible surface of the transom profile, which edge is facing the overlap chamber of the second frame profile, is in alignment with the second joint. a) the transom profile in the region of the end thereof which is intended to be connected is adapted to the contour of the first frame profile and/or second frame profile; b) the overlap chamber of the second frame profile in the region of the end thereof which is intended to be welded is notched in accordance with the facing overlap visible surface of the transom profile; or the overlap chamber of the transom profile adjacent to the overlap chamber of the second frame profile in the region of the end thereof which is intended to be welded is notched in accordance with the facing overlap visible surface of the second frame profile; c) the first and second frame profiles (1, 2) at the facing end faces thereof at least in a part-region of the end faces thereof are welded to each other with at least one joint (T, T1) being formed; d) the transom profile is connected with the end thereof on the first frame profile and/or the second frame profile in the region of the joint (T, T1);