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mechanical engineering: welding and its classification



Welding is a process of joining two metal pieces by the application of heat. Welding is the least expensive process and widely used now a days in fabrication. Welding joints different metals with the help of a number of processes in which heat is supplied either electrically or by mean of a gas torch. Different welding processes are used in the manufacturing of Auto mobiles bodies, structural work, tanks, and general machine repair work. In the industries , welding is used in refineries and pipe line fabrication. It may be called a secondary manufacturing process.
Classification of welding processes:
There are about 35 different welding and brazing process and several soldering methods, in use by the industry today. There are various ways of classifying the welding for example, they may be classified on the basis of source of heat(flames ,arc etc.)
In general various welding processes are classified as follows.
1: Gas Welding
(a): Air Acetylene
(b): Oxy  Acetylene
(c): Oxy Hydrogen Welding
2: Arc Welding
(a): Carbon Arc welding
(b); Plasma Arc welding
(c): Shield Metal Arc Welding
(d): T.I.G. ( Tungsten Inert Gas Welding)
(e): M.I.G. ( Metal Inert Gas Welding)
3: Resistance Welding:
(a): Spot welding
(b): Seam welding
(c): Projection welding
(d): Resistance Butt welding
(e): Flash Butt welding
4: Solid State Welding:
(a): Cold welding
(b): Diffusion welding
(c): Forge welding
(d): Fabrication welding
(e): Hot pressure welding
(f): Roll welding
5: Thermo Chemical Welding
(a): Thermit welding
(b): Atomic welding
6:  Radiant Energy Welding
(a): Electric Beam Welding
(b): Laser Beam Welding
Welding Joints
Different types of welding joints are classified as Butt, Lap , Corner, Tee and edge joints which are shown in figure

Welding Types

Types of welding, welding tips and equipment.
Welding Types Home

Welcome to welding types, this site about welding is to provide information and welding tips for all of the different types of welding, welding equipment and machines, including mig, tig and arc, resistance welding, solid state welding, micro welds, plasma cutting, and learning how to weld,

The main Types of welding used in industry and by home engineers are commonly referred to as Mig welding, Arc welding, Gas welding and Tig welding.mig welding
GMAW or Gas Metal Arc Welding

More commonly called MIG welding this welding type is the most widely used and perhaps the most easily mastered type of welding for industry and home use. The GMAW process is suitable for fusing mild steel, stainless-steel as well as aluminium.tig welding
GTAW or Tungsten Inert Gas

TIG welding is comparable to oxy acetylene gas welding and needs a lot more expertise from the operator. Employed for carrying out high-quality work when a superior standard of finish is needed without making use of excessive clean up by sanding or grinding.arc welding
Arc Welding or SMAW


Generally known as stick or arc welding. Arc welding is the most basic of all welding types, is easy to master in a home welding situation.
Stick welding can be used for manufacturing, construction and repairs, very much well suited for heavy metal size 4 millimetres upwards. Thinner sheet metals and alloys are usually more suited to the mig welding types. gas weldingGas or Oxy
 Acetylene Welding And Cutting

Not used as widely for general welding of mild steel. Consists of mixing oxygen and acetylene gas to greate a flame capable of melting steels. Mostly used today for maintenance work and gas metal cutting. Also common for brazing softer metals such as copper and bronze. Can also be used for welding delicate aluminium parts such as refrigeration pipes.

Gas Cutting equipment for metal construction and maintenance. The most accessible of thermal cutting gear is by qxy-acetylene gas cutting and plasma cutting machines. Other methods include the use of a thermal cutting electrode for use with the arc welder machine
Welders Protective Gear.

Any form of welding offers risks to the operator’s health. To minimise these risks we must use welding equipment and protective gear as welding helmets, gloves, leather jackets and in some cases breathing apparatus.
Welding Machines.

Looking to buy welding machine or welder inverter but aren’t sure on what suits your requirements. What to look for in a welder machine for home and workshop use, Mig , Tig and Arc welders.
How to Weld

Learning how to weld a skill that most will be abl;e to master. From Basic MIG welding to the more advanced TIG welding there are procedures that need to be learned and practiced to become a proficient welder.

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