WJ TOC 2005-12-toc

 WELDING JOURNAL - December 2005, Volume 84, Number 12
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December 2005

FEATURES

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)
The integral of specific current action was used to quantitatively explain the mechanism of spatter production
S. K. Kang and S. J. Na

*Development of Requirements for Resistance Spot Welding Dual-Phase (DP600) Steels Part 2: Statistical Analyses and Process Maps (.pdf)
Weld button diameter was a key factor influencing weld fracture
M. Marya and X. Q. Gayden

Departments

Washington Watchword

Press Time News

Editorial

News of the Industry

Letters to the Editor

Aluminum Q&A

Brazing Q&A

Coming Events

Society News

Tech Topics

Guide to AWS Services

Welding Workbook

New Literature

Navy Joining Center

Personnel

Classifieds (in pdf)

Advertiser Index

Welding Journal (ISSN 0043-2296) is published monthly by the American Welding Society for $90.00 per year in the United States and possessions, $130 per year in foreign countries: $6.00 per single issue for AWS members and $8.00 per single issue for nonmembers. American Welding Society is located at 550 NW LeJeune Rd., Miami, FL 33126-5671; telephone (305) 443-9353. Periodicals postage paid in Miami, Fla., and additional mailing offices. POSTMASTER: Send address changes to Welding Journal, 550 NW LeJeune Rd., Miami, FL 33126-5671.

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