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Wire Feed SystemThe submerged arc welding machine of the wire feed control may be of the following types:1. Voltage sensitive system2. Constant wire feedThe voltage sensitive system operates on the principle of feed back control method. The wire is driven by a variable speed DC motor. The arc voltage is monitored by a sensing element, amplified and fed to the armature of the wire feed motor. Thus, the wire feed rate increases when the arc voltage rises up and vice versa. The arc voltage remains constant during the process. The constant wire feed system operates through a constant speed motor, usually an induction motor. No feed back control is used in this system. This system is used in conjunction with a constant voltage or constant potential characteristic power source. The arc voltage is constant in this system due to the self adjusting nature of the constant voltage power sourc
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what is the difference betwen proof stress and rupture stress?
Calculate thermal efficiency and compression: Q: Calculate thermal efficiency and compression ratio for automobile working on otto cycle. If energy generated per cycle is t
(a) Show that two statements of Second Law of thermodynamics are similar to each other. (b) A house that was heated by electric resistance heater consumed 1200 KWh of electric e
Explain Clamping Devices A clamp is a device that holds the work piece firmly against the locators provided and also resists all forces generated by the cutting action of
Fixed type In this set up, the welding head is kept fixed and the movement required during welding is provided through in the jobs to be welded. A typical application of this arr
vacuum gauge indicates that the pressure of air in a closed chamber is 0.2bar(vacuum).The pressure of the surrounding atmosphere is equilent to a 750-mm column of mercury.The densi
Mash stitch welding An overlap of about 1.15 mm is kept and then the plates are squeezed flash by application of pressure at hot condition. Mash stitch welding is used in the
what is system of force?
A preamble to engine management systems for IC engines objectives, functionalities and main features
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