Topic
Butt welding
About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.
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Journal Article•
TL;DR: In this paper, a new technique called friction stitch welding was developed for the repair of cracked window welds in tubular members in offshore structures, which is a viable alternative to hyperbaric welding or in some instances grouted clamps.
Abstract: Single sided butt and window welds in tubular members have been the cause of fatigue failures in several offshore structures. Under the sponsorship of Chevron UK Limited, The Welding Institute has developed a new technique for the repair of cracked butt welds. This process, named friction stitch welding, is a viable alternative to hyperbaric welding or in some instances grouted clamps, and will be significantly faster
20 citations
TL;DR: In this paper, Zheng et al. used the linear damage accumulation rule to predict the FCI life of 16 Mn steel butt welds under variable amplitude loads and a good agreement was achieved between the predicted results and the test data.
Abstract: Fatigue test results of 16 Mn steel butt welds without crack-like defect under both constant and variable amplitude loads are reported and new procedures are used to predict fatigue crack initiation (FCI) life, fatigue crack propagation (FCP) life and total life of the butt welds. The results indicate that the FCI life and FCP life should be calculated separately and the total life is the sum of the FCI life and FCP life. For the butt welds investigated, stress cycles to initiate a crack of engineering size may occupy more than 70 percent of the total life of the butt welds and it is more suitable to express the total life as a power function of the equivalent stress amplitude {ie275-1}. In predicting the FCI life, the expression of FCI life obtained from the test results of notched specimens is used but the effects of microstructure, surface condition, macro- and micro-geometrical discontinuities at weld toe should be taken into account. In predicting the FCP life, the formula developed by Zheng and Hirt is used and the stress ratio is taken as 0.6 to account for the residual stresses effect on the FCP rate. Because overload produced by the maximum load in a load spectrum has no effect on the FCI life of 16 Mn steel and weldment of the steel, according to the procedures outlined in the paper, one can use the FCI life expression mentioned and the linear damage accumulation rule proposed by Miner to predict the FCI life of 16 Mn steel butt welds under variable amplitude loads. A good agreement is achieved between the predicted results and the test data.
20 citations
TL;DR: In this paper, the authors analyzed the stress concentration factor in transverse butt welded joints experiencing axial tension and bending loads by means of neural network-based models, where the configurations are considered in single-V and double-V forms, and the analysis is also extended to consider joints with axial misalignment.
20 citations
Patent•
21 Nov 2007
TL;DR: In this article, the laser butt-joint welding method for copper or aluminum was investigated in the field of metal joint technology, where the laser focus was adjusted to the bottom of the welding working piece surface.
Abstract: The invention is concerned with the laser butt-joint welding method for copper or aluminum in heterogeneity metal joint technology field. It is: designs the joint between the copper or aluminum and the carbon-steel plate to be slanting end face joint mode without slope, adjusts the focus of the laser beam to the bottom of the welding working piece surface, biases the laser beam to one side of the carbon-steel plate with better absorptivity, in order that another side of the copper or aluminum is heated and melted.
20 citations