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gas flow ratesshielding gas flow requirements are based on cup amp nozzle size weld pool size amp air movement generally the flow rate increases in
argon - hydrogen mixturesargon - hydrogen mixtures are employed in special cases such as mechanised welding of light gauge stainless steel tubing in
heliumhelium he is an inert very light monoatomic gas of atomic weight of 4 it is obtained by separation from natural gas helium is refined to a
argonargon is approximately one and one third times as heavy as air and ten times heavier than helium argon after leaving the torch nozzle forms a
shielding gasesshielding gas is directed by the torch to the arc and weld pool to protect the electrode and the molten weld metal from atmospheric
pulsed dc weldingpulsed dc involves the repetitive variation in arc current from a background low value to a peak value adjustments of the pulse
direct currentusing direct current the tungsten electrode may be connected to either the negative or the positive terminal of the supply of power in
gas lensesgas lenses are used to provide a laminar flow of shielding gas all these attachments have a porous barrier diffuser and are fitted around
limitations of gas tungsten arc welding gtawit produces lower deposition rates than consumable electrode arc welding processesit requires slightly
advantages of gas tungsten arc welding gtawproduces high quality low distortion weldsfree from spatterthe process can be used with or without filler
weld defectsthe common defects encountered in submerged arc welding area slag inclusionb porosityc cracking of welds a slag inclusion slag
welding variablesthe following major process variable play an important role in shaping the weld bead and the resultant weld metal in submerged arc
flux feeding amp recovery systemthe flux is fed by gravity from the flux delivery hopper mounted on the welding head through a tube into the welding
field effect transistors feta field-effect transistor fet is a semiconductor device in which the current flowing through a conduction channel ie
mounting systems for the welding head-boom mounted typethese are the most versatile type of welding systems normally the boom is supported by
mounting systems for the welding head-carriage mounted typein this set up the welding head is mounted on a movable carriage the carriage is
fixed typein 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
the widening web the idea the whole world is agog now had accidental origins here is how it all began in early 1969 the us defence department
internetinternet the global network of computers linked by exclusive and regular phone lines and microwave and satellite signalsextranet an extranet
mounting systems for the welding headsubmerged arc welding head may be mounted by one of the following three methodsa fixed typeb carriage
wire feed systemthe submerged arc welding machine of the wire feed control may be of the following types1 voltage sensitive system2 constant wire
the ideal operational amplifieralthough the characteristics of an ideal operational amplifier are unattainable modern integrated circuit types can
what constitutes erperp typically comprises a client server architecture fourth generation language rdbms and graphical user interface in an open
what is newerp on the other hand begins with a fresh relook at the existing business in fact it is the result of a happy marriage between business
evolution of erp the origin of using computers for business traces the following line of story originally they were designed to support the