The thesis is focused on the technology of scarfing longitudinal welds in welded tubes. The theoretical part describes methods of production tubes. It also analyzes the method used in Mubea company. The experimental part presents the design of two innovative technologies of scarfing welds tubes, their experimental validation and subsequent evaluation. The experimental part also presents a design of the machine that must be produced for this operation.

The objective of the study is to utilize the cross-sectional computation capabilities of a computer to calculate the revolutions per minute, to determine the volume of metal being removed by the machine cutter at any point in the programmed path, and to output the feed rate that the particular situation requires. The six chapters which present the information are as follows: Chapter I, introduction; Chapter II, analysis of factors affecting the computation of speed and feed rate parameters; Chapter III, organization of the input by the numerical control programmer; Chapter IV, modifications to the computer software; Chapter V, evaluation of the benefits of utilizing computed speed and feed rates; Chapter VI, summary, findings, conclusions, and recommendations.