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IIW Recommendations On Methods for Improving the Fatigue Strength of Welded Joints: IIW-2142-110 [Pehme köide]

(TWI, UK), (Norwegian University of Science and Technology (NTNU), Norway)
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IIW Recommendations On Methods for Improving the Fatigue Strength of Welded Joints: IIW-2142-110Suurem pilt
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To help operators and inspectors increase the fatigue strength of new structures or repair or upgrade existing structures, Haagensen (structural engineering, Norwegian U. of Science and technology) and Maddox (mechanical engineering, U. of Strathclyde, UK) draw on previous International Institute of Welding publications to supplement the IIW Recommendations for Fatigue Design of Welded Joints and Components and identify the main methods of weld toe improvement used to increase fatigue strength: burr grinding, tungsten inert gas (TIG) dressing, and hammer and needle peening. They give specifications for the use of each method, including equipment, weld preparation, and operation, as well as guidance on inspection, quality control, and training and assessments of fatigue strength and thickness effects possible with each technique. No index is provided. Annotation ©2013 Book News, Inc., Portland, OR (booknews.com)

The weld toe is a primary source of fatigue cracking because of the severity of the stress concentration it produces. Weld toe improvement can increase the fatigue strength of new structures significantly and can also be used to repair or upgrade existing structures. However, practitioners have reported wide variations in the actual improvements in fatigue strength. Based on an extensive testing program organized by the International Institute of Welding (IIW), this report reviews the main methods for weld toe improvement to increase fatigue strength: burr grinding, TIG dressing and hammer and needle peening. The report provides specifications for the practical use of each method, including equipment, weld preparation and operation. It also offers guidance on inspection, quality control and training as well as assessments of fatigue strength and thickness effects possible with each technique. These recommendations will allow for a more consistent use of these methods and more predictable increases in fatigue strength.
1 Introduction
1(1)
2 Scope
2(2)
2.1 Methods
2(1)
2.2 Materials
2(1)
2.3 Environment and Loading
3(1)
2.4 Types of Welded Joints
3(1)
3 Burr Grinding
4(8)
3.1 Introduction
4(1)
3.2 Equipment
4(1)
3.3 Safety Aspects
5(1)
3.4 Weld Preparation
5(1)
3.5 Procedure
5(3)
3.6 Corrosion Protection
8(1)
3.7 Operator and Inspector Training
9(1)
3.8 Inspection, Quality Control and Documentation
9(1)
3.9 Fatigue Strength of Joints Improved by Burr Grinding
10(2)
3.10 Thickness Effect for Joints Improved by Burr Grinding
12(1)
4 Tungsten Inert Gas (TIG) Dressing
12(9)
4.1 Introduction
12(1)
4.2 Equipment
12(1)
4.3 Weld Preparation
13(1)
4.4 Dressing Conditions and Procedure
14(4)
4.5 Operator and Inspector Training
18(1)
4.6 Remedial Dressing
18(1)
4.7 Corrosion Protection
18(1)
4.8 Inspection, Quality Control and Documentation
18(1)
4.9 Fatigue Strength of Joints Improved by TIG Dressing
19(2)
4.10 Thickness Effect for Joints Improved by TIG Dressing
21(1)
5 Hammer Peening
21(8)
5.1 Introduction
21(1)
5.2 Equipment
21(1)
5.3 Operator and Inspector Training
22(1)
5.4 Weld Preparation
22(1)
5.5 Safety Aspects
23(1)
5.6 Procedure
23(2)
5.7 Inspection, Quality Control and Documentation
25(1)
5.8 Fatigue Strength of Joints Improved by Hammer Peening
26(2)
5.9 Stress Ratio Effects for Joints Improved by Hammer Peening
28(1)
5.10 Thickness Effect for Joints Improved by Hammer Peening
29(1)
6 Needle Peening
29(5)
6.1 Introduction
29(1)
6.2 Equipment
29(1)
6.3 Operator Training
30(1)
6.4 Weld Preparation
30(1)
6.5 Safety Aspects
30(1)
6.6 Procedure
31(1)
6.7 Inspection, Quality Control and Documentation
31(1)
6.8 Fatigue Strength of Joints Improved by Needle Peening
31(3)
6.9 Stress Ratio Effects for Joints Improved by Needle Peening
34(1)
6.10 Thickness Effect for Joints Improved by Needle Peening
34(1)
7 Recommendations Related To Structural Hot-Spot Stress
34(1)
8 References
35(1)
APPENDICES
36
Appendix 1 Participants in IIW Inter-laboratory Test Programme
36(1)
Appendix 2 Bibliography of Publications Consulted
37(2)
Appendix 3 Production Data Sheets
39
Per J. Haagensen is Professor Emeritus in the Department of Structural Engineering at the Norwegian University of Science and Technology (NTNU) and a Consultant. Stephen J. Maddox is a Consultant with The Welding Institute (TWI) in the UK and is also Visiting Professor in the Department of Mechanical Engineering at the University of Strathclyde, UK.