A method of making a weld connection for a fluid line, in particular for the transport of liquid hydrogen by: (a) providing a first fastener connected to a first fluid line and a second fastener connected to a second fluid line; (b) positioning the fasteners so that they face each other; (c) providing a sealing element between the first fastener and the first fastener so that it encloses an inner piping provided within the fasteners when they are connected; (d) pressing the first fastener and the second fastener against each other so that the sealing element is pressed between the fasteners and seals the enclosed inner piping; and (e) welding the first fastener to the second fastener, whereby a continuous weld connection is created which completely surrounds the sealing element and the enclosed inner piping.