W.W. Wiedenhoff

Bio: W.W. Wiedenhoff is an academic researcher. The author has contributed to research in topics: Heat-affected zone & Welding. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

Development of welding technique for longitudinal welded large-diameter pipe production

Abstract: The relationship between the heat input, the welding speed and the wall thickness of the pipe is shown for submerged-arc longitudinal welding of large-diameter pipes using the three-electrode method. Each electrode performs a special function which has to be optimized to arrive at a favorable weld shape. This will be discussed in detail using ac welding with acid flux as an example. Observation of the processes in the welding cavity using x-ray high-speed photography contributes to a better understanding of multiple-electrode welding. Using MnNbV and MnMoNb steels, a report is made on technical alloying measures to increase the toughness values in the dendritic structure of the solidified welds. In so doing, the toughness behavior is examined in relation to the structure appearance and the degree of cleanliness of the welds. Reference is made to the development of water-quenched and tempered large-diameter pipes with especially high non-susceptibility to brittle fracture of the weld and the heat-affected zone.

Case Studies and Applications

Abstract: The purpose of this final chapter is to highlight some of the considerations given in the foregoing ones by drawing detailed examples and case histories from the literature. The examples are not intended to illustrate exhaustively all of the material considered in the previous chapters, but rather have been chosen so that the designer can gain some appreciation as to the process of materials selection and its importance in design and manufacturing considerations.