 December 2005FEATURES Determining the Fatigue Strength of Welds in Marine Structures Steel shipbuilding, as a general rule, begins and ends with welding — Fig. 1. Large seagoing vessels consist almost entirely of welded steel structures. They are predominantly subjected to nonperiodic loads such as wind, waves, flows, impacts in heavy seas, and vibrations from drive systems and auxiliary machines. During an operation period of 20 years, welded ships must bear about 108 load cycles. This associated load spectrum is distributed as linear, to which nonperiodic loads have to be added (Refs. 1–5). In addition, apart from the complex operating loads, climatic influences and the corrosive effect of seawater strongly impair the operational behavior of ships and other marine structures. H. Ozden and K. T. Gursel Laser Surfacing with Wire Feeding The application of lasers for resurfacing/hardfacing machine parts is a relatively new branch of rebuilding technology. This technology enables deposition of a wear-resistant alloy on worn surfaces with minimal penetration and dilution. In this study, the feasibility of resurfacing with a high-power direct diode laser was investigated. Typically, the use of a laser with wire filler metal is applied for K-hole welding (Ref. 1), but there are only a few papers that investigate laser wire deposition. A. Yelistratov and F. Sciammarella Adding Elegance and Security through Custom Ironwork Ornamental metalwork pairs well with the Mediterranean-influenced architecture common throughout South Florida, adding both beauty and security. Crafting gates, fences, stair rails, and interior partitions that complement the architecture of area homes and businesses has kept the folks at Artisan Ornamental Iron & Aluminum, North Miami, Fla., busy for more than 50 years. George (Pop) Rizzo and his wife, Mary, started the business in 1952. Son George joined them in the 1970s. Both his parents have now passed away, so George and his wife, Diana, operate the business. C. A. Wallis Finite Element Modeling of Complex Welded Structures The weldments selected for analysis were beam/column joints proposed for use in the construction of an electrical power substation. Such a joint is shown in service in Fig. 1. The weldments were modeled and analyzed for stress and strain distributions using the finite element method. Bolting up to adjacent components, along with structural loads, produces point loads on the joint structure. These point loads were calculated using closed form calculations (equations) as the design was developed. Due to the relatively high forces applied to this particular structure, there was concern that loads in the column joint assembly might be excessive. F. Perez-Guerrero and S. WELDING RESEARCH SUPPLEMENT *Fatigue Behavior of Welded Joints Part 1 - Statistical Methods for Fatigue Life Prediction (.pdf) Fatigue life and fatigue limit were treated as random variables in this statistical model T. Lassen et al. *A
mechanism of Spatter Production from the Viewpoint of the Integral of
Specific Current Action (.pdf)
*Development
of Requirements for Resistance Spot Welding Dual-Phase (DP600) Steels
Part 2: Statistical Analyses and Process Maps (.pdf) |
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