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Construction Of Welding Machine
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Where;
K = constant (Boltzman constant in joules / kelvin)
A= 200m x 4 = 800mm
T2 = 3500C
T1 = 3150C
X = 50mm
Q = k x 800mm 350 – 3150C
50mm
Where K =8.617 x 10-5 J/k
Q = 8.673 x 10-5 x 800mm (135
50mm
Q =62044.46 J/K
4.1 WINDING DESIGN
The
basic of winding is to have number of turns being wounded around an
appropriate point of the core. Winding design in transformer
construction must be done perfectly and accurately. Since winding the
stacked lamination there are limited space in which the winding can
occupy. Also, there are specific number off turns must not be over or lo
or non less than. It must be wound to give the desire rating. Window is
usually made on the former which basically should be thermo setting
plastic or non conducting much, that is suitable to withstand the
minimum thermal dissipation of the machine. The gauge wire are chosen to
withstand the current ratting and care to be insulated with current
paper or other appropriate material using starch as gum. The primary
winding gauge is chosen to be 12 with standard wire gauge copper
conductors. Winding are done to fill the window of the lamination having
completed the winding on the former, it is then subjected to
varnishing to keep each layer of the winding to very form on each other
and to avoid loss packing and expansion. The merits of varnishing
obviate humming when the transformer is in use. After all this, the
winding is wrapped with insulating cloth and plastered together with a
suitable paper tape. The advantage of wrapping cloth is that it serves
as additional coolant when soaked in the coolant.
4.2 INSULATION PROCEDURE
The housing is cut out of iron (mild steel) sheet metals according the
required measurement. It is then welded at each point after folding to
form a box, in which the transformer together with its accessories are
placed. The housing top cover is also marked out and cut into shape.
Folded arc welded to form the cover. All the joint in a welding machine
which arc not fastened together by bolt and knot or stud are joined by
welding. For instance the handle, the holding frame are welded to give
stable and strong structure for the sake of handling.
In the case
of electrical connection in the welding machine, insulators are used to
give insulators between the metals in the machine and bare or expose
electric wire. This is done to avoid electric shock to the welding
personnel or the malfunction of electrical circuit.
After all this,
the installed transformer accessorized are placed inside the
transformer housing with the complete assembly and cover. The cooling
system on exhaust fan is provided which serve to cool the machine
continuously during operation.
Next is to attach all the cables; the
power cable going to the general AC mains are connected to its terminals
and also the welding cable to its own terminals. After this, the
electrode holder (welding tong) and clamp are attached with electrode
and work piece the machine is ready for test running.
4.3 POWER SOURCE
In the case of this projects alternative current (AC) is used because
it is readily available. There are other source of power that can be
used its complicated and expensive to get. As a result of this, this
project is limited to AC power source of 220v to 240v which can be
obtained from the power supply of the country or power plant generator.
4.4 ELECTRODE TYPES
Electrodes are designed according to the purpose of used. Some of
these are for depositing hard alloy, filling metals cast iron and
stainless steel.
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ABSRACT - [ Total Page(s): 1 ]ABSTRACT COMING SOON ... Continue reading---
CHAPTER ONE - [ Total Page(s): 2 ]CHAPTER ONE1.0 INTRODUCTIONIn the past with the necessary of metals it always seems impossible to join two metals together with grooving riveting, this idea leads to alternative of finding a lasting solution to the problem. This brought about the idea of a welding machine with a well laminated core and coil wound together to form a high rated transformer which is immersed in a can of oil.Welding is the most economical and efficient way to join metals permanently. It is the only way of join ... Continue reading---
CHAPTER TWO - [ Total Page(s): 3 ]ii. OXIDIZING FLAMEOxidizing welding flame are produced hen slightly more than one volume of oxygen is mixed with one volume of acetylene. To obtained this type of flame, the flow of oxygen is then increased until the inner cone is shortened to about one tenth of it original length when the flame is properly adjusted, the inner cone is pointed and slightly purple. An oxidizing flame can also be recognized by it distinct hissing sound. The temperature of this flame is approximately 6300oF ( ... Continue reading---
CHAPTER THREE - [ Total Page(s): 4 ]CHAPTER THREE3.0 GENERAL DESCRIPTION AND ITS WORKING PRINCIPLERegarding the design and fabrication of this project several information were gathered through consultation of previous journals text books and internet.Definition: “welding is the process of joining together two pieces of metal so that bonding take place at their original boundary surface s. when two parts to be joined are melted together, heat or pressure or both is applied and with or without added metal for formation o ... Continue reading---
CHAPTER FIVE - [ Total Page(s): 10 ]Now let assume a load having a power factor such that the secondary current is in phase with E2 the primary current must now have two component.1. I1 to maintain the useful flux2. I2 to neutralize the demagnetizing effect of the secondary current.Since the flux of each limb is link only with the winding by which it is produced, it is referred to as leakage flux and its responsible for reducing an e.m.f. of self inductance in the winding with which it is linked. The reluctance o ... Continue reading---
CHAPTER SIX - [ Total Page(s): 1 ]CHAPTER SIX6.0. CONCLUSION AND RECOMMENDATION6.1 CONCLUSION The project is a form of providing student with appreciable skills p4actically designed to expose or equip them with real working operation of machine and how they are being constructed and a better understanding of one’s own career goals and for the progress of the nation.The project seemed easy and simple but later on turn to be useful and interesting project for Engineering students. With all the proble ... Continue reading---
REFRENCES - [ Total Page(s): 1 ]REFERENCESFlood CR (1981) “Fabrication of welding and joining process†1st Edition, Butterworth and Co publisher limited London, P.P 21 – 25, 28 36- 37 and 39.Google: http://weldguru.com/welding-flamesFlood CR and parkin N. (1974) “craft practice “ 1st Edition pergamon press limited, New YorkDavies A.C (1984) “Welding science and technology†8th edition Cambridge Universities press. London Pg-42B.L. and A.K.Therage (1994 Textbook of Electri ... Continue reading---
