cwb group - canadian welding association | cwa acs · pdf filewelding grade p5, p9, p11, p22,...

Welding Grade P5, P9, P11, P22, P91 & Similar Alloys

The Canadian Welding Association (CWA) Conference on welding of Chrome Moly Grade Alloys will deal with many aspects of weld properties, heat treating, design, codes, metallurgy, cracking issues, etc. Over the past several years, many utilities have experienced issues due to cracking and in some cases catastrophic failures of these materials. This Conference will try to create greater awareness of what the issues are and hopefully provide some solutions on how these challenges may be solved.

TUESDAY, MARCH 22, 2016 TIME: 8:30 AM – 4:00 PM

CWB GROUP: 206 19th Avenue, Nisku Industrial Park, Nisku, Alberta T9E 0W8

CHROME MOLY CONFERENCE


The Canadian Welding Association • Association canadienne de soudage 8260 Parkhill Drive Milton, ON L9T-5V7 • www.cwa-acs.org • 1-800-844-6790

WELDING PRACTICES FOR P11 AND P22 MATERIALS

Prepared by: Iulian Radu, Joel Pepin, Kenneth Armstrong, Joyce Lam – PCL Industrial Constructors Inc.

As current coal power generation facilities are phased out, new gas-fired pow-er generation plants are planned. Despite oil price volatility, the maintenance and construction of oil sands extraction and processing facilities remain a sig-nificant part of Alberta’s economy. All these applications require extensive welding on creep-enhanced materials such as P11 and P22.

This presentation describes some methods used to successfully and produc-tively weld such materials. It focuses on the use of welding processes such as GMAW, SAW and GTAW with solid, flux cored and metal cored wires, with and without post weld heat treatment (PWHT). Code and typical client require-ments are addressed regarding the procurement, welding and PWHT of P11 and P22 materials.References and Copyright status (indicating ownership of material, noting any prior publication(s)).

BIO: Iulian (Julian) Radu is a welding engi-neer with PCL Industrial Constructors of Edmonton, Alberta. He holds a BSc in Welding Engineering from Romania and a PhD in Materials Engineering from the University of Alberta. Julian has more than 15 years of experience in research, development, design, con-struction, and operations in oil sands, heavy machinery, structural steel, off-shore and shipbuilding industries.



IDENTIFICATION AND CHARACTERIZATION OF INTER-CRITICAL HEAT-AFFECTED ZONE IN AS-WELDED GRADE 91 PIPE JOINT

Prepared by: Yiyu Wang and Leijun Li – Department of Chemical and Materials Engineering, University of Alberta

The inter-critical Heat-Affected Zone (ICHAZ) is the most susceptible region for the type IV creep cracking in grade 91 and similar Cr-Mo steels. Observation and study of ICHAZ are challenging due to its small thickness, usually a couple of grain sizes, compared with the size of the entire weld joint. In this work, a practical and efficient metallurgical method, involving micro-hardness mea-surement and light-etching technique, is introduced to identify the exact loca-tion of the ICHAZ in the cross-sectional P91 weld joint.

Structurally, the ICHAZ lies between the fine grain heat-affected zone and over-tempered zone of the base metal. Thermally, the peak temperature ex-perienced by the ICHAZ during the welding thermal cycle falls between the Ac1 and Ac3. The micro-hardness value (205 HV0.5) in the ICHAZ is slightly lower than both the adjacent fine grain heat-affected zone (228 HV) and the base metal (215 HV0.5). The ICHAZ exhibits a characteristic structure that is a mixture of coarse ferrite (over tempered base metal) and fine equi-axed grains (similar to the fine grained heat-affected zone). The large grain size variation is apparent under an optical microscopy (OM) and a field-emission scanning electron microscopy (FESEM). In the ICHAZ, the tempered martensite from the base metal is over tempered and decomposes to coarse precipitates and thicker lath-type ferrite; the newly formed austenite grains have transformed, on-cooling, to short martensitic packets/blocks.

The undissolved precipitates at the boundaries between the parent blocks re-main at their original locations during the austenitization. Precipitates in the ICHAZ are relatively “stable”, which differs from the precipitate coarsening in the fine grain heat-affected zone and precipitate dissolution in the coarse grain heat-affected zone.

BIO: Yiyu Wang Yiyu (Jason) Wang is a PhD candidate and Dr. Leijun Li is a professor in the Department of Chemical and Materi-als Engineering, University of Alberta. Their research focuses on basic and ap-plied research in microstructure char-acterization and properties evaluation.

BIO: Leijun Li Dr. Li has supervised research students in fusion and solid-state welding, and laser and plasma-enabled additive manufacturing technologies. Dr. Li serves as Principal Reviewer for the Welding Journal and Key Reader for the Metallurgical and Materials Trans-actions. He is a Fellow of the American Society of Materials and a past chair of the Joining Critical Technologies Com-mittee of ASM.



DISSIMILAR METAL WELDING CHALLENGES INVOLVING CHROME-MOLY’S & OTHER ALLOY FAMILIES

Prepared By: Bill Newell - Euroweld

One of the major challenges facing the welding industry is joining dissimi-lar materials. This is especially true when joining chrome-moly and Creep Strength-Enhanced Ferritic (CSEF) steels to low carbon, austenitic stainless steels and even nickel base alloys. The traditional codes are nearly silent on the issue.

Operating conditions, whether constant or varying, can also affect what must be considered to achieve satisfactory results. Many design, shop, or field orga-nizations do not have or have lost expertise in this area. This paper addresses issues including design, code requirements, material properties, weld proper-ties, preheat/post weld heat treatment, buttering and transition material ap-proaches plus practical considerations. Case histories and practical examples are provided to illustrate proper implementation of dissimilar welding.

BIO: William F. Newell, Jr., PE, PEng, IWE is involved in welding engineering ap-plications and consulting for over 40 years, both domestic and internation-ally. Graduated from the Ohio State University in Welding Engineering and holds an International Welding Engi-neer diploma. A Professional Engineer in Ohio, North Carolina, South Carolina, Tennessee, Texas, plus Alberta, Cana-da. Life Member - American Welding Society, Chair of AWS D10; Member on ISO/TC 44, ASME Section IX – Welding and Brazing Qualifications, Chair of ASME SCII/IX Subgroup on Strength of Weldments, and ASME SCII Working Group on Creep Strength-Enhanced Ferritic Steels. President of W. F. New-ell & Associates, Inc., and Co-Founder/Vice President – Engineering of Eurow-eld, Ltd..



ELECTRODES FOR PRODUCING ULTRA-CLEAN WELD DEPOSITS IN CR-MO STEEL

Prepared by: Susan Fiore - Hobart Filler Metals, Troy, Ohio

Hobart® Filler Metals has developed a line of flux-cored arc welding (FCAW) consumables that are unique in the welding industry. The products have a basic slag system, but do not operate like traditional EXXXT-5 electrodes. Tra-ditional T-5 electrodes have a low-melting, fluid slag, which makes welding out-of-position especially difficult. A high level of calcium fluoride adversely affects the stability of the arc and causes weld spatter. While the weld metal mechanical properties and crack-resistance of traditional T-5 electrodes are ex-cellent, the welder appeal and ease of use are sorely lacking.

The new wires utilize aluminum for deoxidation, which has the added benefit of very clean weld deposits. They are designed for DC electrode negative cur-rent and use alternative fluorine sources, which results in very good welder appeal and all-positional capabilities, including vertical down. The novel use of aluminum in a gas shielded process results in very low oxygen, nitrogen and sulfur content, providing exceptionally clean, tough weld deposits.

The primary focus of this presentation will be on the E81T5-B2M, E91T5-B3M and E91T5-GM (B3V). These products have excellent toughness in both the as-welded and stress-relieved condition. The X-Factor, which is a measure of weld cleanliness and resistance to temper embrittlement, is typically between 8 and 13 (products that have an X-factor that is less than 20 are considered to be low risk for temper embrittlement).

The E91T5-GM has approximately 0.2 wt-% vanadium and is designed for weld-ing vanadium-enhanced 2¼ Cr/1 Mo steels. It can be used vertically down and is the only FCAW product that outperforms low hydrogen covered electrodes on deposition rate and mechanical properties.

BIO: Susan Fiore is an Advanced Appli-cations Manager with Hobart Filler Metals. She is a Materials Engineer with over 20 years’ experience in the welding industry. Her expertise covers a broad range of welding and weldabil-ity-related concerns. She has extensive experience with issues related to the weldability of steels and nickel-based alloys, including weld metal solidifica-tion cracking, heat-affected zone liqua-tion cracking, and ductility-dip crack-ing. She has also worked extensively in the area of weld safety and health. In her current role with Hobart, she works closely with customers to re-solve issues and to promote new ideas and welding innovations. Susan is past chair of the AWS Safety and Health Committee. Prior to joining Hobart Brothers, she worked at Law-rence Livermore National Laboratory as Weld Safety Manager, and at Edison Welding Institute as a Project Manager and as a Senior Engineer in EWI’s Tech-nical Division.



Seminar Cancellation Policy: The seminar registration fee, less 25% per person, will be refunded if cancellation is made in writing on or before March 4, 2016. There will be no refund for cancellation after this date.

CEU CREDITS: THIS SEMINAR QUALIFIES FOR 0.5 CEU’S

AGENDA:8:30 – 9:00 Breakfast and Registration

9:00 – 9:10 Opening Remarks and Introductions

9:10 – 10:30 Iulian Radu – Welding Practices for P11 and P22 Materials

10:30 - 10:50 Morning Break

10:50 – 12:00 Yiyu (Jason) Wang and Dr. Leijun Li - Identification and Characterization of Inter-critical Heat-Affected Zone in As-Welded Grade 91 Pipe Joint

12:00 – 1:00 Lunch (included)

1:00 – 2:10 Bill Newell – Dissimilar Metal Welding Challenges Involving Chrome-Moly’s & Other Alloy Families

2:10 – 2:20 Afternoon Break

2:20 – 3:30 Susan Fiore - Electrodes for Producing Ultra-Clean Weld Deposits in Cr-Mo Steel

3:30 – 4:00 Roundtable discussion with Presenters

Should you require hotel accommodations, please contact Comfort Inn 780 955 8007 and request CWB Group pre-ferred room rate of $115 Queen, $120 King. 203 – 19 Avenue, Nisku, AB T9E 0W8 (located directly across the street from our facility)

Registration: www.cwa-acs.org/eventsMember: $425Nonmember: $525Students: $150Educators: $150

CLICK HERE TO REGISTER

cwb group - canadian welding association | cwa acs · pdf filewelding grade p5, p9, p11, p22,...

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