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EQUIPMENT FOR RESISTANCE WELDING
The equipment for resistance welding is different from that for arc welding for the following reasons: Resistance welding machines are complicated and very costly. Automation and controls are more in these. Many resistance welding equipments are custom - built. The machines can be operated with single phase or three phase mains. The equipment may be direct energy or stored energy machines. All the resistance welding machines require a low voltage, high current output (current in the order of thousand to lakhs of amperes). Four main constituents are:1. Electrical Power source2. Mechanical system3. Control equipment4. Feeding system
Which conducts heat faster steel copper or brass? Ans) Copper conducts heat faster than steel or brass. Any material that is good for conducting heat is also good for electricit
PRE HEAT INTERPASS TEMP. REQUIREMENTS FOR FILLER METALS The preheat and inter pass temperature must be sufficient to prevent the cracking.Previous Experience has shown that t
what is swelling and shrinking
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Determine the bending (o-, ) and shear stress ( Tx), ) at the surface element shown on the solid circular shaft below. Use Mohr's circle to determine the principle stresses, a l
Grease Gun: A grease gun is shown in Figure. This is used to supply semi-solid lubricant (grease) for chassis lubrication. Figure : Grease Gun
WEDG E FRICTION: Explain how wedge is used for raising heavy loads. Also give principle of it. Sol.: Principle of wedge: A wedge is small piece of material having two
A single phase series resistive-inductive heating element draws a measured current of 15A when connected to a 225V single phase 50 Hz AC supply. Tests have shown that a minimum
A cam is required to a lift of 30 mm for a rotation range of 60 o . The follower then dwells at this level for a further 90 o and then falls over the next 60 o . Finally the rest
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