Mechanical Engineering

[...] appear as dark circular images, isolated or in clusters. Gas holes are caused by gas trap in molten metal. Suppose the molten metal solidifies in the casting before all gases escape, it results in gas [...]

[...] ) Warping c) Inclusions d) Non of them Ans.: b) Warping   6. Casting defects caused by the molten metal is a) Blow holes b) Swell c) Scab d) All of the above Ans.: d) All of the above   7. [...]

[...] from the arc thus formed produces temperatures of 10000 degree Fahrenheit or higher. A pool of molten metal consisting of base metal and filler metal is formed near the tip of the electrode. Both [...]

[...] . This portion of the operation is known as the upset period. This action ensures that the molten metal oxides and other impurities are extruded out of the surfaces to be joined and satisfactory [...]

[...] of uniform width, happening in the middle of the weld. This is caused by the failure of the weld metal to fill the root gap. 4. Lack of fusion appears on the radiograph as a thick, dark line. It may [...]

[...] spatter losses and protects the welded joint from oxidation. As welding proceeds, the molten weld metal and the liquid flux cool and solidify under a layer of unused flux. The molten flux on [...]

[...] , the process was named CADWELD. Components of CAD Weld: 1. Mould to fit your conductors. 2. Weld Metal required by your mould including drop metal disk. 3. Handle Clamps or Frame. 4. Flint Ignitor ( [...]

[...] and alloys can be welded by arc welding processes with proper electrodes. The arc and the weld metal pool are protected by the arc flame and slag produced and controlled by the electrode coating. [...]

[...] a Generator and Inverter? An inverter is only effective if there is already a source of electrical energy. It cannot generate its own. It can simply convert electrical energy that is already there. [...]

[...] reaction. Both batteries and hydrogen fuel cells exchange chemical energy into electrical energy and also, it generates heat as a by-product of this process. However, a battery holds a [...]

[...] to flash welding except that the arc is produced by the rapid discharge of stored electrical energy across an air gap between the ends of the work pieces to be welded. It belongs to a [...]

[...] reflect the light from flash tube to the ruby rod, and a high voltage power supply to give electrical energy to the flash tube.   Nd: Glass Lasers In 1961 first Neodymium Glass laser was [...]

[...] Projection Welding: The projection welding process is similar to spot welding except that the welding pressure, and welding current. Hence the [...]

[...] Gas Welding Process: Gas welding is a fusion process in which fusion is obtained by completely melting the joint.& [...]

[...] Tungsten Inert Gas (TIG) or Gas Tungsten Arc welding (GTAW): It is an arc welding process wherein coalescence is produced by heating the job with an electric arc struck between a [...]

[...] 5 to 10 mm in diameter, with a heat affected zone extending slightly beyond the nugget into the base metal. Spot welding machines are available in three different varieties: 1. Stationary single spot [...]

[...] makes you for i. The contraction of the thermit steel in cooling ii. The shrinkage of the base metal which has been heated during the welding operation 3. Construct the mold: After the parts [...]

[...] temperatures of 10000 degree Fahrenheit or higher. A pool of molten metal consisting of base metal and filler metal is formed near the tip of the electrode. Both ferrous and non-ferrous metals [...]

[...] Ultrasonic Welding: Ultrasonic welding is represented as a friction welding method, where oxides and other contaminants present on [...]

[...] Ultrasonic Welding: The human ear can hear mechanical vibrations in the frequency range of 16 Hz to 16 KHz. [...]