Welding science and technology

Welding science and technology

[...]... — Inert-gas -Welding TIG and MIG — Plasma Arc — Electro-slag 3 Resistance Welding — Spot — Seam — Projection 1 2 Welding Science and Technology — Butt Welding — Induction Welding 4 Solid State Welding — Friction Welding — Ultrasonic Welding — Explosive Welding — Forge and Diffusion Welding 5 Thermo-chemical Welding — Thermit Welding — Atomic H2 Welding (also arc welding) 6 Radiant Energy Welding — Electron... discussing Gas Welding, Arc Welding, Shielded Metal Arc, Submerged Arc, Tungsten Inert Gas, Metal Inert Gas, Metal Active Gas Welding, Resistance Welding, Electroslag Welding, Spot, Seam and Projection Welding, Flash Butt and Upset Butt Welding, and high Frequency Welding Advanced welding processes such as Electron Beam welding, Laser Beam Welding, Plasma Arc Welding, Explosive Welding, Friction Welding, ... EGW flux cored arc welding FCAW coextrusion welding CEW cold welding CW diffusion welding .DFW explosion welding .EXW forge welding FOW friction welding FRW hot pressure welding HPW roll welding ROW ultrasonic welding .USW Arc welding (AW) Solid state welding ISSWI Soldering (S) Brazing (B) Welding processes flash welding FW projection welding PW resistance seam welding RSEW –high... general guide and may not necessarily be valid for specific situations 1.5 WELDlNG QUALITY AND PERFORMANCE Welding is one of the principle activities in modern fabrication, ship building and offshore industry The performance of these industries regarding product quality, delivery schedule and productivity depends upon structural design, production planning, welding technology 6 Welding Science and Technology. .. resistance brazing RB torch brazing TB electron beam welding EBW –high vacuum EBW.HV –medium vacuum EBW.MV –nonvacuum .EBW.NV electrostag welding ESW flow welding FLOW induction welding IW laser beam welding LBW percussion welding PEW thermit welding TW air acetylene welding AAW oxyacetylene welding OAW oxyhydrogen welding OHW pressure gas welding PGW air carbon arc cutting AAC carbon arc... of heat to melt and join metals, pressure or filler metal may or may not be required These processes include • Shielded metal arc welding (SMAW) • Submerged arc Welding (SAW) • Gas metal arc (GMA, MIG, MAG) • Gas tungsten arc (GTA, TIG) 12 Welding Science and Technology • Plasma arc welding (PAW) • Electroslag/Electrogas Welding Arc is struck between the workpiece and the electrode and moves relative... pool forms on the top sheet and fuses into the sheet underneath, producing a plug/spot weld This welding is ideal for situations having access to one side of the joint only The equipment required is light 16 Welding Science and Technology and portable Process is slow and not adaptable to fully mechanised control as spot welding 2.2.4 Metal Inert Gas (MIG) Welding In MIG welding the arc is maintained... This causes up-setting Uniform and accurately mating surfaces are desirable to exclude air and give uniform heating 22 Welding Science and Technology Power source 1 Light contact – Flash welding 2 Solid contact – Upset butt welding 3 Airgap – Percussion welding Solid contact Bar stock Force or impact Clamps or dies Fig 2.13 Sketch of resistance butt welding 2.3.7 Percussion Welding This process makes... the widest application Reducing flame is used for the welding of monel metal, nickel and certain alloy steels and many of the non-ferrous, hardsurfacing materials Oxidising flame is used for the welding of brass and bronze is supplied through the torch, in pure form 1 4 5 • • 10 Welding Science and Technology Reducing valves or regulators Torch and mixing device Flame Combustible gas Gas supply Hoses... Before welding After welding Fig 2.11 Projection welding 21 Review of Conventional Welding Processes 2.3.4 Seam Welding Seam welding is a continuous spot welding process where overlapped parts to be welded are fed between a pair of copper alloy (roller disc shaped) electrodes (Fig 2.12) Current Force Force Fig 2.12 Sketch of seam welding 2.3.5 Flash Welding It is classified as a resistance welding