tailieunhanh - Fabricators' and Erectors' Guide to Welded Steel Construction

More than 200 polymers are used for electrospinning like silk fibroin (Zarkoob et al., 2004; Sukigara et al., 2003; Jin et al., 2004), collagen (Mathews et al., 2002), chitosan (Ohkawa et al., 2004), gelatin (Ma et al., 2005) etc. In the field of tissue engineering electrospinning technique is applied for the preparation of nanofiber scaffold design. The process is very versatile in terms of use of polymers, non-invasive and does not require the use of coagulation chemistry or high temperature for fiber generation. Basically, in this process a high voltage is used to create an electrically charged jet of. | James F. Lincoln Al undation Fabricators and Erectors Guide to Welded Steel Construction By Omer W. Blodgett . . R. Scott Funderburk Duane K. Miller . . Marie Quintana . This information has been provided by The James F. Lincoln Arc Welding Foundation to assist the general welding industry. The serviceability of a product or structure utilizing the type of information presented herein is and must be the sole responsibility of the builder user. Many variables beyond the control of The James F. Lincoln Arc Welding Foundation or The Lincoln Electric Company affect the results obtained in applying this type of information. These variables include but are not limited to welding procedure plate chemistry and temperature weldment design fabrication methods and service requirements. This guide makes extensive reference to the AWS Structural Welding Code-Steel but it is not intended to be a comprehensive review of all code requirements nor is it intended to be a substitution for the code. Users of this guide are encouraged to obtain a copy of the latest edition of the code from the American Welding Society 550 . LeJeune Road Miami Florida 33126 800 443-9353. Copyright 1999 Fabricators and Erectors Guide to Welded Steel Construction Table of Contents 1 Introduction .1 2 Welding SMAW .1 ESW EGW .10 3 Welding Process Joint Requirements .11 Process Special Situations .12 4 Welding Cost 5 Welding Procedures .15 Effects of Welding Variables .15 Purpose of Welding Procedure Specifications WPSs .17 Prequalified Welding Procedure Specifications .18 Guidelines for Preparing Prequalified WPSs .20 Qualifying Welding Procedures By Examples .22 Approval of WPSs .22 6 Fabrication and Erection Guidelines .23 Fit-Up and Backing and Weld Tabs .23 Weld Access Holes .24 Cutting and Gouging .25