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Logarithmic Mean temperature Difference is used to measure the Heat transfer rate in double pipe heat exchanger. The rate of heat transfer is got from the formula - Q = U.A.LMTD . U= Heat Transfer Co-efficient A= Heat Transfer Surface Area LMTD= Mean Temperature Difference LMTD is the logarithmic temperature difference between the hot and cold fluids passing through the each ends of heat

Stress: When any object of certain material is subjected to tensile or compressive or shear force, there may be a chance that its dimension will be affected. If the dimension of a material is changed due to application of forces we can say that the material is under stress or experiencing the state of stress. Stress is defined as the Force per unit cross section area. Stress = F/A Stress is

Plastics can be classifies into two broad categories - Thermosets and Thermoplasctics. A brief description of these two classes will be discussed here. Thermosets are the kind of plastics which are not recyclable. They undergo a kind of chemical change at the time of heating. As a result they can be shaped once because of this permanent chemical change. This process is known as heat hardening.

EDM is a non-conventional machining technique uniquely used for cutting metals which are not possible to cut with traditional methods. EDM only works with materials which are electrically conductive. Delicate cavities and intricate contours which are difficult to produce with a grinder or other machines can be done with Electrical Discharge Machining or EDM. The cutting tool for EDM may be made

Electrochemical Machining (ECM) is based upon Faraday's law of electrolysis. Faraday's law states that the the mass of a metal altered by the electrode is proportional to the quantity of electrical charges transferred to that electrode. In ECM the removal of metal is controlled by the anodic dissolution in the electrolyte. In ECM - The workpiece acts as the anode The tool act as cathode.

In Water jet Machining no abrasive is used. Water jet alone is used for cutting. In WJM, materials like concrete, asbestos, wood, rocks, coal, textiles and leather can be cut. The material is removed by means of erosion. These days hydraulic coal mining as well as tunneling, descaling and cleaning is also done by this process. Water Jet Machining (WJM) Principles As

Magnetically impelled arc butt (MIAB) welding (sometimes referred to as rotating arc welding) is a rapid, clean, and reliable arc welding process that employs forging to produce the finished weld. As such, it is classified as an electric arc welding process since that is the energy source for producing melting or fusion, even though pressure from forging is needed to complete the weld. It is

Miller Welders are one of the most famous manufacturers of TIG welding equipment. Performing TIG welding perfectly is an art. And for a clean, successful and accurate TIG weld we need efficient welders and efficient welding machine. Miller TIG welder always comes handy in achieving the desired weld. Miller manufactures two types TIG of welding equipment AC/DC all type metal welder (including

Welding is an art. There are different types of welding methods. TIG or Tungsten Inert Gas Welding is technique for great welded joints. TIG or Gas Metal Arc Welding (GMAW) needs some great craftsmanship to master. And for this reason we need some decent welding machine from a renowned company. Miller TIG Welder is great when it comes to weld an accurate and clean weld. Please Read : Miller

Catalytic Converters Catalytic converter is a way of treating exhaust gases. These convert harmful pollutants into harmless gases. A catalyst is a material that causes chemical change without entering into chemical reaction. In effect the catalyst encourages to react with each other. For example, in the HC/CO catalytic converter, the catalyst encourage5 the HC to unite with oxygen to produce

The History of TIG Welding Russel Meredith applied for a patent for TIG or GTAW in 1941. He is most credible for the invention of TIG welding. The main application of TIG or GTAW is found in effective welding of light aircraft. MIG welding of GMAW was invented before TIG welding but light aircrfat welding needed more reliable welding as well as more fusion power and TIG welding is very

Connecting rod big-end bearings are precision-insert bearings. The insert-type bearing is usually not adjustable. However, it can be replaced, if the rod, crankpin, and other engine components are in good condition. When a rod bearing falls, an analysis should be made to determine the cause. Then the cause can be eliminated so that the failure will not repeated. Lets move into the failure

The purpose of this article is to create a list of mechanical engineering books for the core courses of Mechanical Engineering. There are a number of books available for the meticulous study of Mechanical Engineering subjects. If we were able to study all the books of ME core courses then it would have been great ! But sadly it is not possible. And most of the times it is not possible to buy all

The piece of wire or rod used to carry current for welding is known as an electrode or welding electrode. It may or may not have flux covering. The electrode produces arc at one end and other end is gripped by a electrode holder. In this article we will discuss the classification of welding electrode as well as explain different welding electrodes types. Please read about: Different types of

If it is assumed that a single process is good enough to approach practical problems in production then it is a total non-sense. There are a lot of methods useful for manufacturing goods. The most difficult part is selecting the right method of production. For manufacturing a product one should bear in mind its appropriate configuration, financial conditions and adequate supplies of materials and

Gas Metal Arc Welding (GMAW) and Gas Tungsten Arc Welding (GTAW) are suitable for aluminum welding. Aluminum alloy castings need the same technique applied to aluminum sheets and many different wrought products. Many castings are vulnerable to thermal strains because of delicate designs and varying cross sectional areas. Sometimes aluminum alloy castings need heat treatments before welding. TIG

In this article we will be - Identifying common welding defects Preventing and fixing problems with your welds If I could wave my magic filler rod and make it so that all your welds would be strong, clean, and sharp-looking, I’d certainly do it. But the last time I went to the welding supply shop and asked to buy a magic filler rod, they looked at me like I was nuts, so for now you just have to

Working Principle of Resistance Projection Welding (RPW) In resistance projection welding (RPW), small projections are formed on one or both pieces of the base metal to obtain contact at a point which localize the current flow and concentrate the heat. Under pressure, the heated and softened projections collapse and a weld is formed. Projection on the upper component is pressed against the

Resistance Spot Welding (RSW) Working Principle Resistance Spot welding is comparatively modern welding process. It came in to the field of welding in between years 1900 - 1905. It is a most widely used resistance welding method. The main purpose of resistance spot welding method is to join two to four light gauge overlapping metal sheets (which can have thickness up to 3 mm) . At first

Resistance Seam Welding (RSEW) Working Principles The Resistance Seam Welding (RSEW) is very much similar to the Spot Welding (RSW) but here circular rotating electrodes are used. And here we get continuous weld which is air-tight (If the process is perfect). The seam-welding form of the resistance process is a series of overlapping welds. Two or more sheets of base metal are usually passed