Welding of Metals Welding Welding is the process
![Welding of Metals Welding of Metals](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-1.jpg)
![Welding • Welding is the process of joining together pieces of metal or metallic Welding • Welding is the process of joining together pieces of metal or metallic](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-2.jpg)
![following are the key features of welding: • The welding structures are normally lighter following are the key features of welding: • The welding structures are normally lighter](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-3.jpg)
![largely used in the following fields of engineering: • Manufacturing of machine tools, auto largely used in the following fields of engineering: • Manufacturing of machine tools, auto](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-4.jpg)
![Classification according to source of energy employed to heating the metal Classification according to source of energy employed to heating the metal](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-5.jpg)
![Gas Welding • Oxy-acetylene Welding: Ca. C 2 + 2 H 2 O = Gas Welding • Oxy-acetylene Welding: Ca. C 2 + 2 H 2 O =](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-6.jpg)
![Gas welding Apparatus 1. Oxygen cylinder 2. Acetylene cylinder 3. Pressure gauges 4. Valves Gas welding Apparatus 1. Oxygen cylinder 2. Acetylene cylinder 3. Pressure gauges 4. Valves](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-7.jpg)
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![Gas welding two types Gas welding two types](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-10.jpg)
![Gas welding torch Gas welding torch](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-11.jpg)
![Welding Goggles Welding Goggles](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-12.jpg)
![ELECTRIC ARC WELDING The welding in which the electric arc is produced to give ELECTRIC ARC WELDING The welding in which the electric arc is produced to give](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-13.jpg)
![Principle of Arc • A suitable gap is kept between the work and electrode Principle of Arc • A suitable gap is kept between the work and electrode](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-14.jpg)
![Arc Welding Arc Welding](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-15.jpg)
![](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-16.jpg)
![Electric Power for Welding • AC current or DC current can be used for Electric Power for Welding • AC current or DC current can be used for](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-17.jpg)
![Arc welding power supply by 2 types For Thin Metals Arc welding power supply by 2 types For Thin Metals](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-18.jpg)
![Types of Electrodes Coated electrodes Bare electrodes Types of Electrodes Coated electrodes Bare electrodes](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-19.jpg)
![TYPES OF JOINTS • Butt Joint TYPES OF JOINTS • Butt Joint](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-20.jpg)
![TYPES OF JOINTS • Lap joint • T- joint • Corner joint TYPES OF JOINTS • Lap joint • T- joint • Corner joint](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-21.jpg)
- Slides: 21
![Welding of Metals Welding of Metals](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-1.jpg)
Welding of Metals
![Welding Welding is the process of joining together pieces of metal or metallic Welding • Welding is the process of joining together pieces of metal or metallic](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-2.jpg)
Welding • Welding is the process of joining together pieces of metal or metallic parts by bringing them into intimate proximity and heating the place of content to a state of fusion or plasticity
![following are the key features of welding The welding structures are normally lighter following are the key features of welding: • The welding structures are normally lighter](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-3.jpg)
following are the key features of welding: • The welding structures are normally lighter than riveted or bolted structures. • The welding joints provide maximum efficiency, which is not possible in other type of joints. • The addition and alterations can be easily made in the existing structure. • A welded joint has a great strength. • The welding provides very rigid joints. • The process of welding takes less time than other type of joints.
![largely used in the following fields of engineering Manufacturing of machine tools auto largely used in the following fields of engineering: • Manufacturing of machine tools, auto](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-4.jpg)
largely used in the following fields of engineering: • Manufacturing of machine tools, auto parts, cycle parts, etc. • Fabrication of farm machinery & equipment. • Fabrication of buildings, bridges & ships. • Construction of boilers, furnaces, railways, cars, aeroplanes, rockets and missiles. • Manufacturing of television sets, refrigerators, kitchen cabinets, etc.
![Classification according to source of energy employed to heating the metal Classification according to source of energy employed to heating the metal](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-5.jpg)
Classification according to source of energy employed to heating the metal
![Gas Welding Oxyacetylene Welding Ca C 2 2 H 2 O Gas Welding • Oxy-acetylene Welding: Ca. C 2 + 2 H 2 O =](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-6.jpg)
Gas Welding • Oxy-acetylene Welding: Ca. C 2 + 2 H 2 O = Ca (OH)2 + C 2 H 2+2. 5 O 2= 2 CO 2+H 2 O(vapour)+ 306. 800 cal /mol
![Gas welding Apparatus 1 Oxygen cylinder 2 Acetylene cylinder 3 Pressure gauges 4 Valves Gas welding Apparatus 1. Oxygen cylinder 2. Acetylene cylinder 3. Pressure gauges 4. Valves](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-7.jpg)
Gas welding Apparatus 1. Oxygen cylinder 2. Acetylene cylinder 3. Pressure gauges 4. Valves 5. Hose pipes 6. Torch 7. Welding tip 8. Pressure regulators 9. Lighter 10. Goggles
![](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-8.jpg)
![](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-9.jpg)
![Gas welding two types Gas welding two types](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-10.jpg)
Gas welding two types
![Gas welding torch Gas welding torch](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-11.jpg)
Gas welding torch
![Welding Goggles Welding Goggles](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-12.jpg)
Welding Goggles
![ELECTRIC ARC WELDING The welding in which the electric arc is produced to give ELECTRIC ARC WELDING The welding in which the electric arc is produced to give](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-13.jpg)
ELECTRIC ARC WELDING The welding in which the electric arc is produced to give heat for the purpose of joining two surfaces is called electric arc welding.
![Principle of Arc A suitable gap is kept between the work and electrode Principle of Arc • A suitable gap is kept between the work and electrode](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-14.jpg)
Principle of Arc • A suitable gap is kept between the work and electrode • A high current is passed through the circuit. • The electric energy is converted into heat energy, producing a temperature of 3000°C to 4000°C. • This heat melts the edges to be welded and molten pool is formed. • On solidification the welding joint is obtained
![Arc Welding Arc Welding](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-15.jpg)
Arc Welding
![](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-16.jpg)
![Electric Power for Welding AC current or DC current can be used for Electric Power for Welding • AC current or DC current can be used for](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-17.jpg)
Electric Power for Welding • AC current or DC current can be used for arc welding. For most purposes, DC current is preferred. • D. C. machines are made up to the capacity range of 600 amperes. • 45 to 95 volts • D. C. current can be given in two ways: (a) Straight polarity welding. (b) Reverse polarity
![Arc welding power supply by 2 types For Thin Metals Arc welding power supply by 2 types For Thin Metals](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-18.jpg)
Arc welding power supply by 2 types For Thin Metals
![Types of Electrodes Coated electrodes Bare electrodes Types of Electrodes Coated electrodes Bare electrodes](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-19.jpg)
Types of Electrodes Coated electrodes Bare electrodes
![TYPES OF JOINTS Butt Joint TYPES OF JOINTS • Butt Joint](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-20.jpg)
TYPES OF JOINTS • Butt Joint
![TYPES OF JOINTS Lap joint T joint Corner joint TYPES OF JOINTS • Lap joint • T- joint • Corner joint](https://slidetodoc.com/presentation_image/b79aca58de99dfcfb86895e14674cc77/image-21.jpg)
TYPES OF JOINTS • Lap joint • T- joint • Corner joint
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