Connection arrangement and method for welding a first plastic component to a second plastic component

A method for welding a first plastic component, which has a first joining region including a socket, to a second plastic component which, at one end, has a second joining region, the method comprising:

• heating a closed induction ring, which is arranged between the first and second joining regions with an alternating electromagnetic field such that the closed induction ring melts plastic polymers of the first and second plastic components, the closed induction ring being formed as a cylindrical or conical hollow base body, and the base body having a lateral surface defining at least one recess configured as a wave-shaped recess or a loop-shaped recess;
• moving the plastic components toward one another under pressure so as to form a materially integral joint in a contact region between a first plastic melt of the first plastic component and a second plastic melt of the second plastic component;
• melting the closed induction ring into the first plastic component so as to form at least one first undercut;
• and
• melting the closed induction ring into the second plastic component so as to form at least one second undercut, with the result that a respective positive joint is formed between the first and second plastic components and the closed induction ring.