There is provided an apparatus for forming a weld joint between abutting ends of first and second tubular members. The welding apparatus includes a support ring defining an aperture therethrough. The support ring has first and second sides defining a channel therebetween. The first and second sides of...http://www.google.fr/patents/US6450395?utm_source=gb-gplus-shareBrevet US6450395 - Method and apparatus for friction stir welding tubular members
Method and apparatus for friction stir welding tubular members
