Welding is broadly classified into two types: I. Plastic Welding: In this case the two pieces of metals to be joined are heated to plastic state and welding is completed by forcing them. In this case no filler material is added. II. Fusion Welding: In this case the two pieces of metal are heated and brought to molten state and [...]
In this article we will discuss about:- 1. Principle of Welding of Steel 2. Standard Welding Processes of Steel 3. Defects 4. Inspection 5. Welding Positions 6. General Considerations 7. Economy 8. Advantages and Disadvantages. Principle of Welding of Steel: Welding is a process of connecting metal parts by fusion. Arc welding and oxy-acetylene welding are the two usual methods [...]
Most important application of computer in welding is for the setting of welding parameters. Computer is used to control the welding process with regard to both static and dynamic characteristics. A computerised welding process controller is designed to handle the various phenomena occurring during the welding process, viz., the start-up sequence, continuous welding-including parameter setting, and the termination sequence. Start [...]
The following points highlight the five main types of resistance welding. The types are: 1. Spot Welding 2. Projection Welding 3. Seam Welding 4. Butt Welding 5. Percussion Welding. Type # 1. Spot Welding: This is probably the simplest form of resistance welding and best suited for ordinary sheet steel. For obtaining good welds having strength, and to avoid the [...]
The following points highlight the main thirty one methods of welding used in industries. The methods are: 1. Plastic Welding 2. Fusion Welding 3. Solid-Phase Welding 4. Cold Welding 5. Forge Welding 6. Pressure Welding 7. Flash Welding 8. Resistance Welding 9. Gas Welding 10. Oxyhydrogen Welding 11. Air-Acetylene Welding 12. Pressure Gas Welding 13. Atomic Hydrogen Welding and Few [...]
In oxyacetylene welding, the two gases used for producing flame are oxygen and acetylene. Oxygen is used to support and intensify combustion. It is generally prepared in factories by liquefying air and then separating it into its component parts by rectification. From factories, it can be obtained under high pressure in cylinders which are fitted with pressure regulators to get [...]
The following points highlight the equipments used for oxyacetylene welding. The equipments are: 1. Welding Torch 2. Pressure Regulator 3. Hose and Fittings 4. Cylinders 5. Goggles 6. Spark Lighter 7. Apron 8. Gloves 9. Welding Rods 10. Fluxes. Equipment # 1. Welding Torch: It is a tool for mixing the two gases in the desired volumes and burning the [...]
In this article we will discuss about:- 1. Meaning of Gas Tungsten Arc Welding (GTAW) 2. Advantages of GTAW Process 3. Polarities 4. GTAW Tungsten Electrodes 5. Shielding Gases. Meaning of Gas Tungsten Arc Welding (GTAW): Air during welding, (viz. oxygen, hydrogen, nitrogen and water vapour) tends to reduce the quality of weld. Inert gases are used to keep contaminants [...]
In this article we will discuss about:- 1. Meaning of Gas Metal Arc Welding (GMAW) 2. Components of GMAW 3. Modes of Materials Transfer 4. GMAW Practices 5. GMAW Welding using Fluxed Wire 6. Safety in GMAW 7. Characteristics of GMAW 8. Advantages of GMAW 9. Limitations of GMAW 10. Recent Advances in Welding Technology. Meaning of Gas Metal Arc [...]
With the engineering industry undergoing a radical transformation involving a steep step-up in production technology as well as production quantities, the need has arisen for welding systems designed for automation with consistent weld quality and dealing in materials much more complex than simple mild steel. 1. Thyristorised Universal Welding Rectifiers: These electronically regulated power sources which can take full care [...]