Panel structure for a friction welding method

摘要

A hollow metal member (31,32) suitable for use in friction stir welding having first and second webs (33,34) which are spaced apart substantially parallel to each other and a cross-web (35,36) connecting said first and second webs, said first and second webs having at one side of the member respective lateral edges which are parallel to each other and are mutually offset so that said first web (34) projects laterally of the member further than said second web (33), said cross-web (35,36) being connected to said second web (33) at said lateral edge thereof and connected to said first web (34) at a region spaced from said lateral edge thereof.