| print this page | |
Weld Cracking VII
|
|
|
AWS Conference attendees are awarded 1
PDH (Professional Development Hour) for each hour of conference
attendance. These PDH’s can be applied toward AWS recertifications and
renewals.
|
|
Monday,
November
16, 2009 — McCormick Place, Chicago
9:00 AM — 4:00 PM
Chairman:
Robert Irving
Co-chairman: David Farson
The most perplexing problem in the welding
industry has to be weld cracking. Back by popular demand, this
conference is for those who want or need to get a handle on any weld
cracking situation. Each presentation will be followed by a five-minute
question-and-answer session.
Conference Registration Fees
AWS/FMA/SME/PMA/NAM Member – $345Nonmember – $480
Register online or via mail/fax form here.
- Each nonmember
attendee will receive
a two-year complimentary membership in AWS.
- The registration fee does not include hotel accommodations. Hotel accommodations are subject to hotel regulations and are the responsibility of the attendee.
- You will receive a CD containing copies of all presentations.
- Each participant will also earn 5 Professional Development Hours (PDHs) for attending the conference. These PDH’s can be applied toward AWS recertifications and renewals.
Program Schedule
9:00-9:30 AM
Keynote Address
William A. “Bud” Baeslack III,
Provost and Executive Vice President, and Professor of Materials
Science and Engineering, Case Western Reserve University, and formerly,
Dean, College of Engineering, Executive Dean for the Professional
Colleges, Professor of Industrial, Welding and Systems Engineering and
Professor of Materials Science and Engineering, Ohio State University
IIn his address, Dr. Baeslack will be
discussing the metallurgical origins of weld cracking in such
high-performance alloys as nickel-base materials and such
high-performance nonferrous alloys as aluminum and titanium, and how
those materials compare to weld cracking behavior in conventional and
advanced steels.
9:35-10:05 AM
New Technique Determines Solid-Liquid
and Solid-State Phase Transformations During Processing
Boian T. Alexandrov, Research
Scientist, Welding Engineering Program, Dept. of Industrial, Welding,
and Systems Engineering, The Ohio State University
A new technique has been successfully applied for in-situ determining
the solidification ranges and solid-state phase transformation
temperatures in welded joints of various alloy steels, non-ferrous
alloys and Ni-base superalloys, and for development of continuous
cooling transformation diagrams. In addition, phase transformation
behavior during weldability testing, post-weld heat treatment, and
casting has also been measured.
Cracking Problems with Grade 91 and Other Creep-Strength Enhanced Ferritic Steels
Jeffrey Henry, President, Energy Solutions Group, LLC
There has been ample discussion over the last several years regarding the need for tight control of the processing of Grade 91 and the other creep-strength enhanced ferritic steels if the improved mechanical properties of these materials at elevated temperature are to be realized. However, failure to control the processing steps, and particularly the post-weld heat treat temperature, can substantially increase the risk of brittle fracture and/or stress-corrosion cracking in the weld. Other factors that can promote cracking at the weldment include deficient design (e.g., saddle welded branch connections), improper support of components, and poor choice of filler metal for dissimilar metal combinations. This talk will review the various reasons that welds in these materials crack, and discuss the appropriate strategies to avoid cracking.
10:45-11:15 AM
Measuring Residual Stress Using X-Ray Diffraction
Robert Drake, Lab Sales, Proto Manufacturing Ltd
Residual stresses in weldments, if undetected, can lead to such problems as stress corrosion cracking or even fatigue cracking. But it is often difficult to determine whether heat treatment or shot peening can be used to cure such conditions without prior knowledge of the residual stress state. X-ray diffraction is being used to provide the information needed. Welding fabricators can buy this type of equipment or they can be serviced on site by trained inspectors equipped with portable x-ray diffraction equipment.
11:20-11:45 AM
Quality Improvements in Heat Treatment
Gary Lewis, Director of Business Development, Superheat FGH
A significant percentage of weld anomalies and material deviations in new alloys (creep strength enhanced ferritic steels) are being attributed to improper heat treatment. Advancements in equipment technology, software and process control solutions, with renewed emphasis on shoring-up weld procedures and industry codes, are revolutionizing traditional business models and enhancing quality assurance at a number of levels, beneficial to plant owners, welding engineers and construction contractors.
11:45-1:00
PM Lunch on your own
Reheat Cracking in Weldments
Jose E. Ramirez, Principal Engineer, Edison Welding Institute
Reheat cracking has been observed in low-alloy steels, stainless steels, and nickel-base superalloys weldments. Reheat cracking is manifested by low rupture ductility and intergranular fracture along (prior) austenite grain boundaries. Reheat cracking typically occurs in the coarse-grained heat-affected zone (CGHAZ) or high-temperature HAZ, and occasionally in the weld metal. Understanding the effect of material chemical composition and microstructure, joint design, welding procedures, and post-weld heat treatment conditions on reheat cracking is of paramount importance to obtaining crack-free weldments.
1:35-2:05 PM
Hot Cracking in Welding of Austenitic Stainless Steels
Damian Kotecki, Damian Kotecki Welding Consultants, Inc.
The talk will focus on solidification cracking, liquation cracking and ductility dip cracking. Then attention will turn to the role of ferrite in preventing hot cracking and means of lessening hot cracking tendencies when ferrite cannot be obtained in the weld metal. Finally, hot cracking caused by foreign metal contamination will be discussed.
2:10-2:40 PM
Fracture Mechanics – Operating with Defects
Kyle Koppenhoefer, Principal, AltaSim Technologies
One of the primary goals for welding engineers and welders is to produce structural welds that are free of defects. Unfortunately, welding defects cannot always be avoided or removed and some may develop during in-service loading. In these situations, applied fracture mechanics can determine the effect of these defects on service life. Theoretical fracture mechanics has been taught to engineers for many years. However, advancements in fracture mechanics, coupled with improved computational capabilities, have extended the application of fracture mechanics to practical problems of interest to welding engineers. This presentation will provide engineers with an understanding of how fracture mechanics can be applied to solve a range of challenges.
2:45-3:15 PM
Hot Cracking in Aluminum Welds
Thom Burns, Director of Technical Services and Business Development, AlcoTec Wire Corp.
The hot cracking of aluminum welds can be a function of contraction stresses or the hot-short tendency of certain weld compositions. When contraction stresses are greater than the weld metal strength at the elevated temperatures of solidification, then cracking will develop in the weld metal itself. In addition, welding procedures can develop alloy compositions within known hot-cracking sensitivity ranges. The problem of hot cracking due to contraction stresses, may be avoided by applying welding techniques that overcome the natural volume change that occurs during the heating and cooling of aluminum. In order to avoid hot-short cracking, it is necessary to understand the effects that alloying elements have on crack sensitivity and how the choice of joint design and the selection of a filler alloy can eliminate it.
3:20-3:55 PM
The Rewards in Purchasing Filler Metal by the AWS 5.01 Specification
William F. Newell, President, Euroweld Ltd.
The AWS A5.01 specification is organized in a logical order and is user friendly. Whether or not all, or part, of the criteria listed in the document for actual lot testing are used depends on the extent to which special criteria are needed to adequately describe the product(s) desired and to reduce the uncertainty of receiving a product that may not meet the procurer's specific needs. As a minimum, the manufacturer is required to have an established quality assurance system and is required to trace the product to some known lot that is unique to that manufacturer. This requirement also applies to those who repackage, relabel and resell another manufacturer’s product that is identified as meeting AWS specification and classification or having the AWS classification imprinted on the electrode.
Adjournment
(800) 443-9353 x 455 (U.S.) or
(305)443-9353 x 455 (Outside the U.S.)
Register online or via mail/fax form here.