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| موضوع: كتاب Welding - Skills, Processes and Practices for Entry-Level Welders الجمعة 26 يونيو 2020 - 0:34 | |
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أخوانى فى الله أحضرت لكم كتاب Welding - Skills, Processes and Practices for Entry-Level Welders Book 2 • Gas Metal Arc Welding • Flux Cored Arc Welding First Edition Larry Jeffus, Lawrence Bower
و المحتوى كما يلي :
Brief Contents Preface . viii AWS Acknowledgment . xi Acknowledgments . xii About the Authors . xiii Chapter 1 Gas Metal Arc Welding Equipment, Setup, and Operation . 1 Chapter 2 Gas Metal Arc Welding . 55 Chapter 3 Flux Cored Arc Welding Equipment, Setup, and Operation . 113 Chapter 4 Flux Cored Arc Welding . 143 Appendix 197 Glossary . 199 Index Contents Preface . viii AWS Acknowledgment xi Acknowledgments xii About the Authors xiii Chapter 1 Gas Metal Arc Welding Equipment, Setup, and Operation 1 Introduction 2 Metal Transfer 4 Axial Spray Metal Transfer 5 Globular Transfer 7 Pulsed-Spray Transfer: GMAW-P 7 Shielding Gases for Spray or Pulsed-spray Transfer 9 Buried-arc Transfer . 9 Short-circuiting Transfer: GMAW-S . 11 Filler Metal Specifications 13 Filler Metal Selection . 14 Stainless Steel Electrodes 15 Aluminum and Aluminum Alloys . 15 Aluminum Bare Welding Rods and Electrodes 20 Wire Melting and Deposition Rates 20 Welding Power Supplies . 21 Speed of the Wire Electrode 23 Power Supplies for Short-circuiting Transfer . 23 Inductance 25 Molten Weld Pool Control 25 Shielding Gas 26 Power Settings . 29 Gun Manipulation . 30 Travel Speed . 30 Electrode Extension 30 Gun Angle 31 Equipment 33 Power Source 34 Electrode (Wire) Feed Unit . 37 Push-type Feed System . 37 vPull-type Feed System 38 Push-pull-type Feed System 39 Linear Electrode Feed System . 39 Spool Gun 40 Electrode Conduit . 41 Welding Gun 41 Spot Welding 42 Face, Eye, and Ear Protection . 44 Face and Eye Protection . 44 Ear Protection 48 General Work Clothing 49 Special Protective Clothing . 51 Hand Protection 51 Body Protection 52 Waist and Lap Protection 52 Arm Protection . 52 Leg and Foot Protection . 52 Chapter 2 Gas Metal Arc Welding . 55 Introduction . 56 Setup 57 Gas Density and Flow Rates 65 Arc-voltage and Amperage Characteristics . 68 Electrode Extension 70 Welding Gun Angle 73 Effect of Shielding Gas on Welding 74 Practices 77 Metal Preparation . 78 Flat Position, 1G and 1F Positions 79 Vertical Up 3G and 3F Positions . 84 Vertical Down 3G and 3F Positions . 86 Horizontal 2G and 2F Positions 89 Overhead 4G and 4F Positions . 91 Axial Spray Transfer . 94 Chapter 3 Flux Cored Arc Welding Equipment, Setup, and Operation 113 Introduction 114 Principles of Operation . 114 Equipment . 117 Power Supply . 117 Guns . 117 Smoke Extraction Nozzles . 119 Electrode Feed 119 vi CONTENTSAdvantages . 119 High Deposition Rate 119 Minimum Electrode Waste 119 Narrow Groove Angle . 120 Minimum Precleaning . 120 All-position Welding 120 Flexibility 120 High Quality 120 Excellent Control . 121 Limitations . 121 Electrodes 121 Methods of Manufacturing 121 Electrode Cast and Helix . 124 Flux 125 Flux Cored Steel Electrode Identification 128 Metal Cored Steel Electrode Identification . 130 Care of Flux Core Electrodes . 130 Shielding Gas . 131 Welding Techniques . 132 Gun Angle . 132 Forehand/Perpendicular/Backhand Techniques 134 Travel Speed 136 Mode of Metal Transfer 137 Electrode Extension . 138 Porosity . 138 Chapter 4 Flux Cored Arc Welding .143 Introduction 144 Practices . 145 Flat-position Welds . 151 Square-groove Welds 152 V-Groove and Bevel-Groove Welds . 154 Root Pass 155 Filler Pass . 156 Cover Pass . 157 Fillet Welds . 160 Vertical Welds . 164 Horizontal Welds . 170 Overhead-position Welds . 175 Thin-gauge Welding . 180 Appendix 197 Glossary
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