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EBOOK - Design of Welded Steel Structures - Principles and Practice (Utpal K. Ghosh)
EBOOK - Thiết kế kết cấu thép hàn - Nguyên tắc và thực tiễn (Utpal K. Ghosh) - 265 Trang.
Arc welding represents the state of the art for fabrication of steel structures. In this technique, controlled heat is applied for joining the components of structures along the line of connection. The performance of welded steel structures depends on a number of factors, of which characteristics and quality of welded joints are the most important. In recent decades, there has been phenomenal development in this technology, which has made arc welding highly attractive in the construction industry globally.
In fact, welded construction has already proved to be of great advantage to stakeholders, namely, architects, structural engineers, contractors, and their clients - end users. It is necessary that more people acquire knowledge and experience in this field to make welding a more powerful tool for an expanding construction industry. It is in the backdrop of this situation that the present book is immensely relevant.
The book deals with both the principles and practice of welding technology, which is required for satisfactory design of welded steel structures and thus should be of deep interest and value not only to the practicing engineers in the design office or in the workshop, but also to teachers and students in academia.
The presentation of text in this book is somewhat different from that in normal engineering books. This book should be regarded as a complementary work to the more analytical studies, which present worked-out examples. Consequently, topics not usually covered in existing textbooks but are nevertheless important for the understanding of the subject have found place in this work.
1. Electric Arc Welding Processes ....................................................................1
1.1 Introduction ...........................................................................................1
1.2 Manual Metal Arc Welding .................................................................2
1.3 Metal-Active Gas Welding ...................................................................4
1.4 Submerged Arc Welding ......................................................................6
1.5 Stud Welding .........................................................................................8
1.6 Control of Welding Parameters ...........................................................8
1.7 Selection Criteria of Welding Process ................................................9
1.7.1 Costs ...........................................................................................9
1.7.2 Location of the Work .............................................................10
1.7.3 Welding Position ....................................................................10
1.7.4 Access ......................................................................................10
1.7.5 Composition of Steel ..............................................................10
1.7.6 Availability of Welding Consumables ................................10
1.7.7 Availability of Skilled Welders ............................................11
1.8 Safety Aspects .....................................................................................11
Bibliography ...................................................................................................11
2. Welded Joints .................................................................................................13
2.1 Introduction .........................................................................................13
2.2 Types of Welds .....................................................................................13
2.2.1 Fillet Weld ...............................................................................13
2.2.2 Butt Weld .................................................................................14
2.3 Types of Welded Joints .......................................................................15
2.3.1 Butt Joints ................................................................................15
2.3.2 Tee Joints .................................................................................15
2.3.3 Corner Joints ...........................................................................15
2.3.4 Lap Joints .................................................................................16
2.4 Heat-Affected Zone .............................................................................16
2.4.1 Chemical Composition of Steel ............................................17
2.4.2 Rate of Cooling .......................................................................18
2.5 Interacting Variables ...........................................................................19
2.5.1 Composition of the Parent Metal, Electrode, and Flux ....19
2.5.2 Welding Process .....................................................................19
2.5.3 Environment ...........................................................................20
viii Contents
2.5.4 Speed of Welding ...................................................................20
2.5.5 Thermal Cycle of Weld ..........................................................20
2.5.6 Size and Type of Joint ............................................................20
2.5.7 Manipulation of Electrodes ..................................................20
2.6 Residual Stresses .................................................................................20
2.6.1 Heat Treatment .......................................................................22
Bibliography ...................................................................................................22
3. Defects in Welded Joints .............................................................................23
3.1 Introduction .........................................................................................23
3.2 Defects in Welds ..................................................................................24
3.2.1 Undercut ..................................................................................24
3.2.2 Porosity ....................................................................................25
3.2.3 Slag Inclusion ..........................................................................25
3.2.4 Pin Holes .................................................................................26
3.2.5 Incomplete Root Penetration ................................................26
3.2.6 Lack of Fusion ........................................................................26
...
EBOOK - Thiết kế kết cấu thép hàn - Nguyên tắc và thực tiễn (Utpal K. Ghosh) - 265 Trang.
Arc welding represents the state of the art for fabrication of steel structures. In this technique, controlled heat is applied for joining the components of structures along the line of connection. The performance of welded steel structures depends on a number of factors, of which characteristics and quality of welded joints are the most important. In recent decades, there has been phenomenal development in this technology, which has made arc welding highly attractive in the construction industry globally.
In fact, welded construction has already proved to be of great advantage to stakeholders, namely, architects, structural engineers, contractors, and their clients - end users. It is necessary that more people acquire knowledge and experience in this field to make welding a more powerful tool for an expanding construction industry. It is in the backdrop of this situation that the present book is immensely relevant.
The book deals with both the principles and practice of welding technology, which is required for satisfactory design of welded steel structures and thus should be of deep interest and value not only to the practicing engineers in the design office or in the workshop, but also to teachers and students in academia.
The presentation of text in this book is somewhat different from that in normal engineering books. This book should be regarded as a complementary work to the more analytical studies, which present worked-out examples. Consequently, topics not usually covered in existing textbooks but are nevertheless important for the understanding of the subject have found place in this work.
1. Electric Arc Welding Processes ....................................................................1
1.1 Introduction ...........................................................................................1
1.2 Manual Metal Arc Welding .................................................................2
1.3 Metal-Active Gas Welding ...................................................................4
1.4 Submerged Arc Welding ......................................................................6
1.5 Stud Welding .........................................................................................8
1.6 Control of Welding Parameters ...........................................................8
1.7 Selection Criteria of Welding Process ................................................9
1.7.1 Costs ...........................................................................................9
1.7.2 Location of the Work .............................................................10
1.7.3 Welding Position ....................................................................10
1.7.4 Access ......................................................................................10
1.7.5 Composition of Steel ..............................................................10
1.7.6 Availability of Welding Consumables ................................10
1.7.7 Availability of Skilled Welders ............................................11
1.8 Safety Aspects .....................................................................................11
Bibliography ...................................................................................................11
2. Welded Joints .................................................................................................13
2.1 Introduction .........................................................................................13
2.2 Types of Welds .....................................................................................13
2.2.1 Fillet Weld ...............................................................................13
2.2.2 Butt Weld .................................................................................14
2.3 Types of Welded Joints .......................................................................15
2.3.1 Butt Joints ................................................................................15
2.3.2 Tee Joints .................................................................................15
2.3.3 Corner Joints ...........................................................................15
2.3.4 Lap Joints .................................................................................16
2.4 Heat-Affected Zone .............................................................................16
2.4.1 Chemical Composition of Steel ............................................17
2.4.2 Rate of Cooling .......................................................................18
2.5 Interacting Variables ...........................................................................19
2.5.1 Composition of the Parent Metal, Electrode, and Flux ....19
2.5.2 Welding Process .....................................................................19
2.5.3 Environment ...........................................................................20
viii Contents
2.5.4 Speed of Welding ...................................................................20
2.5.5 Thermal Cycle of Weld ..........................................................20
2.5.6 Size and Type of Joint ............................................................20
2.5.7 Manipulation of Electrodes ..................................................20
2.6 Residual Stresses .................................................................................20
2.6.1 Heat Treatment .......................................................................22
Bibliography ...................................................................................................22
3. Defects in Welded Joints .............................................................................23
3.1 Introduction .........................................................................................23
3.2 Defects in Welds ..................................................................................24
3.2.1 Undercut ..................................................................................24
3.2.2 Porosity ....................................................................................25
3.2.3 Slag Inclusion ..........................................................................25
3.2.4 Pin Holes .................................................................................26
3.2.5 Incomplete Root Penetration ................................................26
3.2.6 Lack of Fusion ........................................................................26
...
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