FSW

Introduction

Rolling stock’s body shell material is being changed from steel to stainless steel and aluminum as the results of maintenance free, reduction of parts number, and reduction of weight, requirement.
Recently double skin car body shell using aluminum hollow extrusion has been proposed to reduce the number of car body shell parts.
Up to now, body shell is usually built by using arc welding, for example, continuous arc welding MIG,MAG, or arc spot welding.
But, these arc welding method heat up the material over the melting point, then shrinkage after welding make large distortion on the body shell panels.
These parts does not look good and it is difficult to adjust interior panels and other outer inner fittings.