Multi-walled tubular member and method of forming

Details Multi-walled tubular member and method of forming Multi-walled tubular member and method of forming

C - Chemistry, Metallurgy

21

D

C21D 8/10 (2006.01) B21D 39/04 (2006.01) B32B 1/08 (2006.01) C21D 1/42 (2006.01)

Patent

CA 2021677

A multi-walled composite tube member is formed from two superimposed pipes having a gap therebetween. The inner pipe is forcibly expanded in excess of the gap to deform and expand the outer pipe. The expander including a mandrel is forced through the aligned pipes while maintaining the longitudinal alignment. The diameter of the mandrel corresponding to the final desired diameter to finally size the composite pipe section and establish a true round inner passage. An induction heating coil operating at a low frequency operating in the range of low hundreds hertz in contrast to a conventional high frequency unit operating at thousands of hertz is coupled to and moved relative to the expanded pipe unit, progressively heats small lengths of the expanded pipe unit. The expanded pipe unit is guenched with a chilled brine solution applied to both surfaces. The brine solution provides a rapid interchange of heat and hardening of the inner liner, while application to both surfaces improves the hardening of the outer pipe wall. The composite pipe is formed in a single pass to avoid distortion which may occur on each of a plurality of heating passes, and to improve grain growth, minimize cracking and reduce energy consumption and cost.

ube composite multiparois formé de deux tuyaux superposés ayant un espace libre entre eux. Le tuyau intérieur est agrandi par force de manière à occuper plus que l'espace libre, afin de déformer et d'agrandir le tuyau extérieur. L'extendeur, incluant un mandrin, est entré de force dans les tuyaux maintenus alignés Le mandrin, dont le diamètre correspond au diamètre final désiré, permet d'obtenir le diamètre final de la section de tube composite et de disposer d'un passage intérieur véritablement rond. Un serpentin de chauffage par induction fonctionnant à basse fréquence, soit dans la gamme de quelques centaines de hertz, comparativement à un serpentin conventionnel à haute fréquence fonctionnant à des milliers de hertz, relié au tuyau mandriné et déplacé en fonction de ce dernier, chauffe progressivement de petites longueurs du tuyau mandriné. Le tuyau mandriné subit un trempage dans une solution de saumure refroidie qui est appliquée sur les deux surfaces. La solution de saumure permet un échange rapide de chaleur et le durcissement du revêtement intérieur, tandis que son application sur les deux surfaces améliore le durcissement de la paroi du tuyau extérieur. Le tuyau composite est formé en une seule passe afin d'éviter la distorsion qui peut se produire lors d'une des nombreuses passes de chauffage, de favoriser la recristallisation secondaire, de minimiser les fissures et de réduire la consommation d'énergie et les coûts.

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