TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA new Amorphous Diffusion Bonding (ADB) technology is being developed to overcome the known problems involved in shop welding and field weld repairs of coiled tubing and their poor fatigue properties. The objective of the technology is to join long lengths of seamless tubing prior to reeling using a high speed diffusion bonding system in conjunction with a thin film of amorphous metal. The new technology is part of an overall project to develop a high fatigue resistance seamless coiled tubing.The key technology of ADB involves finished ends of tubulars being butted together with an amorphous thin film filler metal between the ends. The amorphous film at elevated temperatures creates a diffusion of atoms across the interface and encourages a mutual diffusion of the filler metal and joining metal in the local area of contact.Extensive laboratory testing has been carried out during a feasibility study including metallurgical examination and small scale bend and reverse bend fatigue testing. Additionally, a small amount of full scale fatigue testing has been undertaken and further testing has been scheduled for the future. The results indicate a bonded joint that is/has; homogeneous with the parent metal; no deformation; a small smooth upset; resistance to fatigue equal to that of the parent metal.From the tests carried out to-date the indications are that the bonded joint has a superior fatigue life to that of the TIG welded joint by an order of magnitude in excess of three and it is evident that this can be improved on. This paper centers on whether Amorphous Diffusion Bonding is a valuable and applicable contribution to seamless reeled tubing systems within the oil industry.