Method and device for connecting profile parts

A method for connecting a first plastic profile part (2) to a second plastic profile part (2), comprising:

• bringing into contact a front edge of the first profile part (2) and a heating surface (34) of a heating element (36) in a joining direction in order to start to melt the first profile part (2) in its welding area before it is joined to the second profile part (2),
• moving, from a resting position to a working position relative to the first profile part (2) and relative to the heating element (36), a delimiting element (7), said delimiting element (7) comprising at least one contact element (21) and a molded part (22), both of which are movable relative to each other and movable relative to the first profile part (2), keeping at least a profiled section (26) of the molded part (22) in contact with the heating surface (34) of the heating element (36) and keeping the contact element (21) in contact with a profile surface (9) of the first profile part (2) as the welding area of the first profile part (2) is melted;
• and
• before the first profile part (2) is compressed for joining to the second profile part, moving the contact element (21)—together with the molded part (22)—of the delimiting element (7) in the direction of its working position so that the profiled section (26) of the delimiting element (7) extends beyond the front edge (4) of the first profile part (2) to create a holding plane (37).