Joining laminated cylinders by butt welding - min. angle between welding line and inner lamination avoids defects

A laminated cylinder is joined to another (non)-laminated cylinder by butt welding along a line which forms a suitable angle alpha with the tangent of the layers. The object is to avoid cavity-formation and similar welding defects when joining multi-layered cylinders. In welding along the cross-section of the two cylinders at the joint-line, a welding line is chosen which forms a minimum angle alpha with the tangent of the innermost lamination. This angle is thus the angles formed by the tangents of the other laminations with the welding line. by keeping the angle alpha to a min. the length of the welding pass between the outside dia. and the inner dia. is increased and each weld-layer has the chance to solidify before the next layer is deposited welding defects are avoided.