Arc welding processes handbook 1st edition ramesh singh 2024 scribd download

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Arc Welding Processes Handbook 1st Edition Ramesh Singh

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Arc Welding Processes Handbook

Scrivener Publishing

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Publishers at Scrivener

Martin Scrivener (martin@scrivenerpublishing.com)

Phillip Carmical (pcarmical@scrivenerpublishing.com)

Arc Welding Processes Handbook

This edition first published 2021 by John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, USA and Scrivener Publishing LLC, 100 Cummings Center, Suite 541J, Beverly, MA 01915, USA

© 2021 Scrivener Publishing LLC

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Library of Congress Cataloging-in-Publication Data

ISBN 978-1-119-81905-9

Cover image: Double headed GMAW system provided by the author

Cover design by Russell Richardson

Set in size of 11pt and Minion Pro by Manila Typesetting Company, Makati, Philippines

the USA

2.12.6

2.12.21

2.14

2.14.1

2.12.21.1

2.15.4

2.16

3.7.2.3

3.21

3.25.4

3.25.5

3.25.6

3.25.7

3.25.10.1

3.25.10.2

3.25.10.3

3.25.14

3.25.13.1

3.25.14.1

4.6

4.5.2

4.5.3

4.5.4

4.6.2.1

4.6.3

4.13.3.5 5xxx Series Alloys

4.13.3.6 6XXX Series Alloys

4.13.3.7 7XXX Series Alloys

4.13.4 The Aluminum Alloy Temper and Designation System

4.13.5 Wrought

4.13.6

4.13.7

4.13.8

4.13.8.1

4.13.9 Welding

4.13.10

4.13.11.1 The Elements that Promote Ferrite are

4.13.11.2 The Elements that Promote Austenite are

4.13.11.3

4.13.12 Weldability

4.13.12.1

4.13.12.2

4.13.12.3

4.13.12.4 Intergranular Corrosion in the Heat Affected Zone Control of Carbide Precipitation

4.13.12.5

4.13.12.16

4.13.12.17

5.3

5.4

5.5

5.4.1

5.4.2

5.5.5

5.5.6

5.5.7

5.5.8

5.5.9

5.6

5.7

5.7.2

5.8.1

5.8.2

5.8.3

5.8.4

5.8.5

5.8.6

5.8.7

5.8.7.1

5.9

5.9.1

5.9.2

5.9.3

5.9.3.3

5.9.3.4

5.10

5.9.4

5.9.5

6.4

6.5

6.6

6.5.1

6.6.1

6.7.1

7.1

7.3

6.10.2

6.10.3

6.10.4

6.10.5

6.10.6

6.10.7

7.4

7.7

7.8

7.9

Figure 2.6 Above (2 graphs), graph 1 above, shows the volt-ampere curve, (output curve or slope) at lower stings. Graph 2 below, shows the volt-ampere curve, (output curve or slope) the steep slope of a “Drooper” type of constant current arc welder

Figure 2.7

schematic above shows the key components of an AC transformer

Figure 2.7.4 A schematic of a movable coil reactor, the position of the reactor coil causes the inductive reactance of the secondary output coil resulting in the variance in current output 21

Figure 2.7.5 A magnetic amplifier transformer output control, the diode allows the current to flow in one direction, and this allows a remote control operation possible

Figure 2.7.6 The top portion of the figure shows the use of diodes – shown in Red color, and it compare it with Silicon controlled rectifiers (SCRs)

Figure 2.7.7 A schematic drawing of single-phase DC power source with SCR bridge control

Figure 2.8.1 Shows the schematic of single phase bridge type rectifier

Figure 2.8.2 Three phase bridge-type rectifier

Figure 2.8.1.1 Schematic diagram of a DC generator

Figure 2.8.1.2 Circuitry of an exciter system

Figure 2.8.3 Current conversion and resulting wave forms

Figure 2.8.3.1 Copper and aluminum welding leads: note the number of fine wires that compose a cable, and the rubber sheathing that covers them

Figure

Figure 2.11.4

Welding positions for welding a plate, the positions are primarily designated in relation to the position of the weld to the horizontal

Figure 2.11.3.5 A single pass fillet weld with (arc termination) stop in the middle and restarted (arc re-initiation) from that point

Figure 2.11.3.6 A multi-passes fillet weld-note the termination of arc start and stops are

Figure 2.11.3.7 A micro-etch of a double sided two pass fillet weld – compare the weld with the nomenclatures figure given above, to see how these two welds meet the standard requirements

Figure 2.11.4.1

Figure

Figure 2.11.5.1 Offsetting the weld setup for distortion control

Figure 2.11.9 This is a rotator with one end of the pipe held in a three-jaw, self-centering chuck the free end of the pipe rests on a free rotating roller, it can be raised or lowered to level the pipe to align the weld ends

Figure 2.11.10 This rotator is similar to the one above except that the pipe end is placed on a motor driven set of rollers on one end, and the other end is on the set of idle rollers, which can be lowered or raised to align and level the weld joint

Figure 2.11.11 A heavy-duty rotator

Figure 2.11.12 Weld tacks bridging two pieces of pipe

Figure 2.11.13 Shows a removable tack

Figure 2.11.14 This picture shows both the bridge tack using external pieces of metal below, and just above that is the tack within the groove using welding

Figure

Figure

Figure 2.11.11.3 The sketch above shows a typical weld layers of several passes –note the sequencing numbers on each pass

Figure 214.1 Nickel is in 10th group and 4th period in the periodic table, its atomic number is

Figure

Figure

Figure 3.3.2 A GTAW welder, note the welding torch, and the filler wire in each hand

Figure 3.4.1 Typical GTAW welding process with details of the welding torch

Figure 3.5.1 A typical GTAW set-up with positions of gas cylinder, welding machine, electrode holder and work-piece

Figure

Figure 3.5.3

Figure

Figure

Figure

Figure 3.7.2.3

Figure

Figure

Figure

Figure 3.9.1 Gas flow meters (A) shows the tube type flow meter, and the bottom (B) has a gauge type flow meter both calibrated in L/min

Figure

Figure

Figure 3.10.4 An assortment of manual welding GTAW torch components

Figure 3.11.2.1 The tip angle 60o, note the depth of the deeper penetration and the shape and depth of the HAZ

Figure 3.11.2.2 The tip angle 30o, note the depth of the shallower penetration and the shape of the HAZ

Figure 3.11.2.3 The tip angle 15o, note the depth of the shallowest penetration and the shape of the HAZ 149

Figure 3.12.1 Five basic weld designs, (Courtesy of Indian Air force training manual “Basic Welding Technology”) 150

Figure 3.16.1 Copper and Aluminum welding leads: note the number of fine wires that compose a cable, and the rubber sheathing that covers them 152

Figure 3.16.2 Various types of cable connectors, and ground clamp. Pictures Curtsy of LENCO catalogue 153

Figure 3.25.9.3.1 Welder is tacking a pipe prior to welding 184

Figure 3.25.9.3.2 A nozzle is welded on a pipe header

Figure 3.25.10.2.1 Schaeffler diagram

Figure 3.25.10.2 DeLong diagram

Figure 4.3.1 Typical GMAW welding

Figure 4.4.1 A GMAW operator welding on an offshore pipeline

Figure 4.4.1.1 Short circuit transfer (arc-action and cycle)

Figure

Figure 4.11.1 Typical GMAW (MIG) welding set up with the external wire feed unit

Figure 4.12.1 A typical GMAW torch with trigger type on-off switch on the handle 255

Figure 4.12.2 Blow out of the GMAW torch that shows some of the components that make up a welding torch 255

Figure 4.12.3 The GMAW torch and the cable connector 256

Figure 4.12.1.4 Copper and aluminum welding leads: note the number of fine wires that compose a cable, and the rubber sheathing that covers them

Figure 4.13.8.1 (a) Contour of a weld bead in the flat position with the work horizontal; (b) welding slightly uphill; (c) welding slightly downhill

Figure 4.13.12.1 WRC diagram

Figure 5.3.1 FCAW-S self-shielding tubular wire process

Figure 5.3.2 FCAW-G, gas shielding solid wire process

Figure 5.4.1 Typical

Figure 5.5.1 FCAW electrode classification system

Figure 5.8.7.2.1 Shows the metal transfer through the arc with CO2 shielding on the left, and 75% Ar. + CO2 on the right 320

Figure 6.3.1 Schematic display of the SAW process 330

Figure 6.3.2 Shows the submerged arc welding of a plate 331

Figure 6.3.3 Shows the SAW of a pipe in a fabrication shop – note the arc and flux position as the pipe rotates 331

Figure 6.3.4 Shows the completed pipe weld

Figure 6.3.5 Higher deposition rate of SAW process

Figure 6.6.1 Showing SAW process in progress on a pipe weld

Figure 6.6.2 Shows the collected flus for cleaning and reusing

Figure 6.7.1 Multi-wire SAW system

Figure 6.7.3 Tandem head strip wire SAW process for cladding

Figure 7.1 Structure of the welding symbol 350

Figure 7.2 Welding symbol arrows

Figure 7.3 Welding symbol position of the arrows

Figure 7.4 Significance of the circle on the arrows

Figure 7.5 Symbols for type of welds

Figure 7.6 Symbol of a fillet weld

Figure 7.7 Shows the side of the metal where the fillet weld is required to be made

Figure 7.8 Graphic and as built depiction of welds – note the weld sizes shown in the symbol on left and its corresponding annotation on the actual weld

Figure 7.9 Shows the addition of the length of the weld to the symbol at the left, and what it means is shown in the as built figure on the right 352

Figure 7.10 Adding pitch of the weld

Figure 7.11 Symbols of various types of Groove Welds 353

Figure 7.12 Symbol of Sq. groove weld – note the annotation of root opening

Figure 7.13 Symbol and as built of V-groove welds, note how the root gap (opening) is shown 354

Figure 7.14 Shows the (1) depth of V groove on both sides of the weld, (2) shows the depth of the penetration desired of the weld

Figure 7.15 Shows the specific depth of the groove weld (effective throat) desired

Figure 7.16 Symbol of a bevel groove note which side of the plate is to be beveled and to what degree

Figure 7.17 Shows U-groove symbol

Figure 7.18 Shows the J-groove symbol and the weld. Note the indicated depth of the weld

Figure 7.19 Symbol of Flare-V groove weld and as built weld

Figure 7.20 Symbol of and as built flare bevel and the weld

Figure 7.21 Shows the melt-thru weld

Figure 7.22 Shows the supplementary symbol of backing bar for the weld

Figure 7.23 Symbol of a plug weld

Figure 7.24 Shows symbols of plug and slot welds, with weld sizes, spacing and depth of the weld

Table 3.11.3

Table 3.16.1

Table 3.17.1

Table 3.21.1

Table 3.22.1

Table 3.24.1

Table 3.24.2

Table 3.25.1

Table

Table

Table

Table

Table

Table

Table

Table

Table

Table

Table

Table

Table

Table 7.7

Foreword

The book, “Arc Welding Processes Handbook”, brings together salient knowledge of arc welding methods used primarily in the industry and especially in the oil patch. The information presented about the welding process is usable and emulates the presence of your own welding engineer. Covering such welding methods as SMAW, GTAW, GMAW, FCAW and SAW with details in materials and techniques. This book is useful to both new welders as well as experienced welders. In the book, Ramesh covers these welding processes, how they work, and dives into the electrical side of welding. Welding machines, Transformers, Generators, Invertors, AC, DC, Sq. wave, Sine wave currents, Rectifiers, SCRs, Diodes, etc., as current control methods, all these are presented in a way that is easy to understand the functions of various welding machines. Most common weldable materials are discussed with welding guidance given that includes Aluminum, Nickel, Carbon steels, Stainless steels, Precipitation Hardened steels, Duplex Stainless steels, and others. The book is super comprehensive, easy to follow, and a welcome addition to any welding engineer’s bookcase. It is a truly great guide for any budding engineer or welder to help them master their skills.

Project Director at Gulf Interstate Engineering, MME, Texas PE 30+ years past-member of ASME, and member of API Committee: Pipeline Construction Voting Group

Preface

The book Arc Welding Processes Handbook has been developed to address the need of a vast majority of people who want to know about welding, some of them also want to weld as hobbyists, or carry their passion for welding to be a professional welder. The book can also be used as a reference by field engineers and managers responsible for welding and fabrication activities. The book uses several figures and illustration that are available in the public domain, yet wherever it could be identified, the credit has been assigned to the source.

The book will provide readers and practitioners of the profession with an understanding of nearly all aspects of arc welding. The book covers the theory, the principles of the processes, the equipment, and the techniques that would improve the competency in welding, for each welding process. A good number of tables and illustrations are included to accentuate the points as well as to give readers familiarity with things that may or may not be available in their work or school trade workshops.

Chapter 1 introduces the reader to all possible welding process, including arc welding, electric resistance welding etc.

The practice welding procedure (WPS) given especially in Chapter 2 on SMAW process should prove a good basis to start welding and develop into an experienced welder. From here, one can move forward with other processes using the practice welding procedures included in Chapter 3 on GTAW, as well as GMAW processes in Chapter 4. For those who want to start welding, they can start with settings in these procedures and preparations and make changes to develop their skills around them. But it is not necessary to strictly follow this sequence, if someone has already developed the skills in any other process and wants to move to any other process.

The skills required to master FCAW process in Chapter 5 almost mimics the basic skills of GMAW in Chapter 4, and once this process is mastered, moving forward with the FCAW process should not be difficult at all.

The process of SAW in Chapter 6 is very different and very few welding schools will have this process in house. For students to practice on it, in most cases it will have to be learned and mastered on the job. But the chapter on SAW process gives the reader abundant information and familiarity with the process that they can step up to the opportunity when it becomes available.

Included in Chapter 7 is the welding symbols and how to use them, to read those symbols on fabrication drawings and weld accordingly. Reading and understanding the language of welding is an important step in becoming a successful welding professional. The chapter also includes other miscellaneous but important information that would come handy to any welding professional. The most important information is the detailed description of welding symbols and how to use and read them.

This book is best used in a workshop where the reader can pick up the welding torch or holder and try to convert the words from the book to an actual weld.

Singh Katy, TX June 2021

Ramesh

Introduction to Welding Processes

1.1

Synopsis

The chapter introduces the most common welding and joining processes, by discussing the acceptable definition of welding, and the elementary understanding of skill development steps required to be a welder or a welding machine operator.

1.2

Keywords

Joining processes, definitions, welding, arc welding, arc efficiency, heat, heat affected zone (HAZ), solidification.

1.3 Welding

When we speak of welding, various images comes to our minds. Depending on persons’ knowledge and experience with the process that can be various, simple or complex. But one thing that can be common to all those images and pictures is that the process of joining two pieces of metal to create a useful object.

This establishes one aspect of the term welding, that is, that the welding is a metal joining process. Let us explore a little more about what is welding, and how it is different from other Joining processes?

There have been discussions and sometimes arguments on describing if welding is an art or a science. Mundane as it might appear the question is pertinent and, in my experience, some well-meaning experts often miss the point as to which part about the term “welding” they are referring about to support their arguments. Welding as the physical and practical part of joining two materials in most part is an art, it requires dexterity in hand, and hand-eye coordination to do a good job. However, the study of the heat and melt flow solidifications prediction, prediction of material behavior under heating and cooling cycles associated with the term welding is a science, an essential pat under the science of physics. Hence it is both an art, and a science of joining metals by use of adhesive and cohesive forces between metals by welding, brazing, and soldering some of these joining processes produce metallurgical bonds. Person with the balanced knowledge of both science, and art parts of welding is expected to do much better work on either side of the argumentative divide. Further we get into the depth of the study, the line of separation from art to physics starts to become more evident.

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