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METAL TRANSFER IN CO2 WELDINGIn CO2 welding, two distinct types of metal transfers are identified viz. short circuiting transfer and free flight globular transfer.Short Circuit Transfer: When the welding voltage and the current are low, the mode of metal transfer would be of short circuiting type. In short circuiting mode, metal transfer occurs from tip of the wire electrode to the job whenever the wire tip touches the weld pool. The arc is extinguished during the short circuit period and is re-ignited after the short circuit is cleared. Short circuiting transfer is used for joining thin sheets, welding out of position and root pass welding of tubes and pipes.Free Flight Transfer: When the arc voltage and current are high, the metal droplets are transferred non axially as large globules and this is called non axial free flight transfer. The non axial free flight transfer produces deep penetration. Hence, this mode of transfer is used for welding thick sections in down hand and horizontal positions.
an air conditioning system is to take place in an outdoor air at 10 degrees celcius and 30% 0f relative humidity at a steady rate of 45 m^3/min and to condition it to 25 degrees ce
Q. Application of hot service insulation? Provision for the expansion of hot equipment shall include the installation of expansion springs in circumferential banding securing i
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Lead Acid Battery : The lead acid type of battery is generally used in all types of two wheelers. It consists of six cells and the rating of the battery is 12 V-2.5 Ah and 12 V-5
A counter flow heat exchanger is used to cool 2000kg/hr of oil(Cp= 2.5 KJ/Kg K) from 105 o C to 30 o C by the use of water entering at 15 o C. If the overall heat transfer coeff
GENERAL TOOLS: General tools include spanners, screw drivers, files, pliers, vices, punches, mallets, chisels, grinders, drilling machine, oil and grease guns, etc.
Corner joint- The flush corner joint is designed primarily for welding sheet metal that is 12 gauge or thinner. It is restricted to lighter materials. The half-open corner join
Can you give me the Prove of the bending Equation M/I=E/R=σ/Y
Q. Nitrogen storage and vaporizer? Bulk cryogenic storage of nitrogen must be located away from process equipment, preferably at the edge or corner of the process area where fi
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