Plastics are considered to be building blocks of technology related structures of modern era. The development of polyvinylchloride, made in Germany, triggered extensive research and development in plastic fabrication work. Critical storages of alloying elements of corrosion resistance steel as well as other technological applications stimulated the use of plastic structures during the Second World War. In plastic welding smaller components are welded together to form complex structures. These structures include installation of process lines ven ....etc

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Introduction


Welding using friction as the major resource
No filler material involved
Welds created by,
a) Frictional heating
b) Mechanical deformation

History
Invented by TWI in 1991 in England
28 organizations worldwide use FSW

Friction Welding

Heat from mechanical energy conversion

Linear friction welding
Rotary friction welding
Material Suitability

Copper and its alloys
Lead
Titanium and its alloys
Magnesium alloys
Zinc
Plastics
Mild steel
....etc

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Underwater welding refers to a number of distinct welding processes that are performed underwater.

The two main categories of underwater welding techniques are wet underwater welding and dry underwater welding, or hyperbaric welding.

In wet underwater welding, a variation of shielded metal arc welding is commonly used, employing a waterproof electrode. Other processes that are used include flux-cored arc welding and friction welding. In each of these cases, the welding power supply is connected to the welding equipment through cables and ....etc

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Orbital welding became practical for many industries in the early 1980s when combination power supply /control systems were developed that operated from 110 VAC and were physically small enough to be carried from place to place on a construction site for multiple in ?place welds. Modern day orbital welding systems offer computer control where welding parameters for a variety of applications can be stored in memory and called up when needed for a specific application. The skills of a certified welder are thus built into the welding system, prod ....etc

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Pile driving at large construction sites produces formidable noise. Marine pile driving similarly can produce high sound pressures underwater”but these can be lethal to fish and can harass marine mammals, including those protected by federal law. This problem has contributed to costly construction delays on major bridge projects. To protect marine life, engineers have designed air bubble curtains to reduce underwater sounds. Air provides an effective barrier to sound propagating through water, because of the difference in density betwee ....etc

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ABSTRACT
Welding being the major asset and salvation for mechanical
engineering, the seminar is all about the automation of major welding
processes used in industries using robots, which was hitherto done
manually under hazardous and perilous working environs. The seminar
dwells with two major industrial welding processes namely continuous
arc welding process and spot welding process. It also connects with
essential features of the robots used in these welding processes and
also the adv ....etc

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please send ppt also ....etc

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Definition

Welding technology has obtained access virtually to every branch of manufacturing; to name a few bridges, ships, rail road equipments, building constructions, boilers, pressure vessels, pipe lines, automobiles, aircrafts, launch vehicles, and nuclear power plants. Especially in India, welding technology needs constant upgrading, particularly in field of industrial and power generation boilers, high voltage generation equipment and transformers and in nuclear aero-space industry.

Computers have already entered the field of weld ....etc

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FRICTION STIR WELDING
Welding process
¢ Welding is a process of joining of different or similar material.
¢ Advantages
Economical, considerable freedom in designing, large no. of dissimilar or similar materials joined, weld as strong as the parent metal.
Different type of welding processes
1. Arc welding.
2. Oxy fuel gas welding.
3. Resistance welding
4. Solid state welding
Arc welding
Carbon arc welding
Electro gas welding
Gas metal arc welding
Gas tungsten arc welding
Plasm ....etc

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