We bring forth high efficiency Servo Micro Processors for single phase as well as three phase applications. Our servo stabilizers are exclusively and precisely designed to protect various costly electric equipments from harm caused during high/low voltage fluctuations and provides them optimum performance. Servo stabilizers are used in Air Conditioning Plants, medical Equipments, Mall & Commercial Complex, Escalators & Elevators, Pharmaceutical Industries and more. Its sturdy construction and sleek design has made it the most demanding stabilizer in the market. 

ADVANTAGES OF SERVO STABILIZERS :

Automatically corrects voltage on regular intervals.
When supplied with constant voltage, synchronous motors operate highly efficiently.
Protects expensive electrical equipments from menace of voltage fluctuation thus lowers the cost on maintenance.
Better efficiency in plant with less production losses.
Increased productivity rate.
100% depreciation as per Income Tax Act.
Reduces the electricity bills approximately up to 15% (This also depends on the input variation loading and the number of working hours).
As the generator is not required to run at High/Low input voltage thus it saves on diesel cost.
The average pay back period of Servo Controlled Voltage Stabilizer owing to its high energy saving capability which is approx. 18 months.

Each and every component of the HT transformer is manufactured and assembled with precision and utmost care. The main process lines of the transformers are: Core: The core is made with laminated and low loss electrical steel sheets that are imported, grain oriented, cold rolled and sheets of high-grade steel. The cores are assembled in a manner that they reduce the noise caused by vibration; individual stamping is coated with insulation varnish which is resistant to heat and oil on both sides. The core is connected to the clamp which ensures that it is effectually earthed. The core legs are bounded with heavy duty insulating tape. The yokes are rigidly and securely clamped between the folded steel channels. Clamps on top and bottom are firmly attached to each other by the means of tie rods. Tie rods serves the duel purpose of transferring the load from the bottom to the top clamps and securing the winding in place. This prevents tensile stress being setup in the core legs, which could adversely affect the iron losses.

Most industries are facing the problems of low voltage, economically and the minimum distortion. The solution is MANUAL TRANSFORMER for an uninterrupted of the voltage to run industries and these Transformers are available in wide capacities to meet all domestic and industrial requirements.

VIRDI CVT Transformers are produced by using state of art Fellow resonant technology. The product is highly economical reliable. It gives you instantaneous voltage regulation, no transient, no spikes, sine wave, output, noiseless operation and high isolation between output Input.

Recommended for Computers, Telex, Fax, Bio-medical Equipments, and Colors Photography Lab, Telecom Equipments etc.

STANDARD RATING : 160 VA to 6000 VA

Seam Welding Machines Offered in 50 to 200 KVA capacity, available in longitudinal/circumferential and universal versions. Precision built, sturdy design and robust construction suitable for high production and uninterrupted service in the manufacturing of drums, barrels, silence, fuel tanks, transformer radiator, water heater auto rims, etc.

These machines are always made to specific customer requirement with highly sophisticated leak proof joints.

Standard Rating :
50,75,100,150 and 200 KVA

To furnish the varying desires of our customers, we are immersed in offering a world class consignment of Projection Welding Machine.

Spot and nut projection possible on the same machine
Robust construction – less vibrations – no maintenance of controller broad / connectors.
Controlled delivery of welding current by made constant current feedback controller.
Quantity watch on every spot. Weak or faulty spot highlighted instantly.
Error and weak spot alarm buzzer.
Fused copper laminate flexible links for lifetime use
High speed cylinder operations gives better cylinder follow up.
Electrode movement made precise by LM bearing.
Engineered for minimum downtime.

High weld abilities are achieved with special type of transformer.
Ability to weld thick material at low speed using short length arms.
In Manually operated machine at low speed using short length arms.
Easy maintenance.

Construction : 
The unit is of robust construction sturdy heavy rigidly reinforced welded steel construction. It combines a compact streamlined appearance with maximum resistance to mechanical deflection. The transformer enclosed in the main frame and is easily accessible, for inspection.

VIRDI's MIG welders are used universally in light and heavy fabrication workshops, shipbuilding auto industries, in manufacture of stainless steel, mild steel, copper vessels container in chemical and allied industries.

These VIRDI CO2/ MIG equipment are designed and engineered for CO2 welding of mild steel, low alloy steels and MIG welding of high alloy steels and light metals.

Salient Features :

Welds mild steel, stainless steel wires & bronze alloy wires
Suitable for solid wires as well as fluxed cored wires
Easy connection system for torch plug-in to wire feeder
Most reliable / easy / maintenance wire feeder with roll / quick release type
Adjustable spot time control available on request
Coarse / Fine controls for proper selection of voltage
Sleek & most flexible torch
Wire feeder units are normally supplied as separate unit to give greater area of operation & flexibility. However in-built version is also available (on request)

olid-state digital timer for precision time control.
Highly productive process (welds 60 Armatures of 24 segments within 60 minutes)
High weld abilities are archived with special type of transformer.
In manually operated machine special mechanism is incorporated in order to increase production by reducing fatigue to operator.
The joints are very strong, durable and can withstand upto 650`C (whereas solder joints can stand only upto 160`C to 200`C)
No need to clean enamel on winding wires.
Weld strength of each segment is same and quality of each weld is far superior than that achieved by soldering.

In arc welding, the intense heat needed to melt metal is produced by an electric arc. The arc is formed between the actual work and an electrode (stick or wire) that is manually or mechanically guided along the joint. The electrode can either be a rod with the purpose of simply carrying the current between the tip and the work. Or, it may be a specially prepared rod or wire that not only conducts the current but also melts and supplies filler metal to the joint. Most welding in the manufacture of steel products uses the second type of electrode. 

Basic Welding Circuit : 
The basic arc-welding circuit is illustrated in Fig. 1. An AC or DC power source, fitted with whatever controls may be needed, is connected by a work cable to the work piece and by a "hot" cable to an electrode holder of some type, which makes an electrical contact with the welding electrode. 

An arc is created across the gap when the energized circuit and the electrode tip touches the work piece and is withdrawn, yet still with in close contact. 

The arc produces a temperature of about 6500ºF at the tip. This heat melts both the base metal and the electrode, producing a pool of molten metal sometimes called a "crater." The crater solidifies behind the electrode as it is moved along the joint. The result is a fusion bond. 

Arc Shielding :
However, joining metals requires more than moving an electrode along a joint. Metals at high temperatures tend to react chemically with elements in the air - oxygen and nitrogen. When metal in the molten pool comes into contact with air, oxides and nitrides form which destroy the strength and toughness of the weld joint. Therefore, many arc-welding processes provide some means of covering the arc and the molten pool with a protective shield of gas, vapor, or slag. This is called arc shielding. This shielding prevents or minimizes contact of the molten metal with air. Shielding also may improve the weld. An example is a granular flux, which actually adds deoxidizes to the weld. 

Figure 2 illustrates the shielding of the welding arc and molten pool with a Stick electrode. The extruded covering on the filler metal rod, provides a shielding gas at the point of contact while the slag protects the fresh weld from the air. 

The arc itself is a very complex phenomenon. In-depth understanding of the physics of the arc is of little value to the welder, but some knowledge of its general characteristics can be useful. 

Nature of the Arc :
An arc is an electric current flowing between two electrodes through an ionized column of gas. A negatively charged cathode and a positively charged anode create the intense heat of the welding arc. Negative and positive ions are bounced off of each other in the plasma column at an accelerated rate. 

In welding, the arc not only provides the heat needed to melt the electrode and the base metal, but under certain conditions must also supply the means to transport the molten metal from the tip of the electrode to the work. Several mechanisms for metal transfer exist. Two (of many) examples include:

Surface Tension Transfer® - a drop of molten metal touches the molten metal pool and is drawn into it by surface tension.
Spray Arc - the drop is ejected from the molten metal at the electrode tip by an electric pinch propelling it to the molten pool. (Great for overhead welding!)

If an electrode is consumable, the tip melts under the heat of the arc and molten droplets are detached and transported to the work through the arc column. Any arc welding system in which the electrode is melted off to become part of the weld is described as metal-arc. In carbon or tungsten (TIG) welding there are no molten droplets to be forced across the gap and onto the work. Filler metal is melted into the joint from a separate rod or wire. More of the heat developed by the arc is transferred to the weld pool with consumable electrodes. This produces higher thermal efficiencies and narrower heat-affected zones. 

Since there must be an ionized path to conduct electricity across a gap, the mere switching on the welding current with an electrically cold electrode posed over it will not start the arc. The arc must be ignited. This is caused by either supplying an initial voltage high enough to cause a discharge or by touching the electrode to the work and then withdrawing it as the contact area becomes heated. Arc welding may be done with direct current (DC) with the electrode either positive or negative or alternating current (AC). The choice of current and polarity depends on the process, the type of electrode, the arc atmosphere, and the metal being welded. 

VIRDI series of welding rectifiers are forced air-cooled, silicon type and are designed to provide a DC Welding current where 3 Phase, 50 Hz AC mains power is available at a voltage ranging from 380 to 440. Arc welding is one of several fusion processes for joining metals. By applying intense heat, metal at the joint between two parts is melted and caused to intermix - directly, or more commonly, with an intermediate molten filler metal. 
VIRDI series of welding rectifiers are suitable for manual arc welding particularly for the welding 

C / DC TIG / MMA Welder 315 is available with us under brand VIRDI DC TIG Welding Systems' and is designed to deliver quality and consistence performance support. Working on non-source power factor compensation technology, these come with advantages of high PF (power factor) as well as switch frequency based operation control. 

Features:

Compact light weight finish
Based on soft switch technology that delivers high operation efficiency
Operations involving HF arc-starting that offers stable arc as well as less spatter with excellent seam
Supported by automatic arc force as well as hot start for performing perfect welding operations Provides for good looking weld
Precision process handling that achieves deep melting as well as low electrode consumption
Simple and convenient to handle knob-control presets of all working parameters & welding state
Features adjustable provisions for argon stopping time of lag and current descending time/current stopping time of arc which enhances TIG welding performance
Delivers excellent weld seam quality
Comes with self-diagnostic function with error code display provision
Helps in achieving synchronous mutual arc function
Suitable for recommended base metals like Al Mg Alloys, Stainless Steel Grades, Mild steel, Aluminum

Applications:
Product Usage:

Bicycle
Fitness equipment
Stainless furniture

Industry Usage:

Maintenance and repair Industry
Plant construction Companies
Container manufactures
Pipeline industry

Inverter TIG / MMA Welder-200A is latest technology based system that match up to the requirements of DC TIG/MMA welding. Designed to deliver excellent welding performance, these come with the option of handling the processes of air carbon arc gouging, electrode welding and contact argon arc welding.

Features: 

Comes with option of post gas adjustment from 0-10s which assists in saving gas as well as in bringing reduction in involved costs
Coming in HF pressure Arc starting & hot arc starting circuit design that allows for high success rate of arc start as well as offer superior synchronization of spot welding
Provides for excellent welding performance through thrust regulation provision that ensures welding shape
Thrust regulation provision also facilitate regulation of welding fusion that allows machines to deliver stronger adaptability to involved welding procedure
Superior dynamic characteristics
Also provides for small spatter as well as stable arc control of welding pool
Delivers superior weld bead
Comes with automatic welding control & auto feedback mechanism
Superior anti-interference design that provides for secure stability and reliable operation support

Optional features:

4T control function for achieving long weld bead operations as well as reduced labor intensity of welder
4T control no-load automatic close capacity
Digitized reference information that allows for high-precision calibration support
EMC electromagnetic compatibility with powerful grid filtering capacity that reduces power supply contamination as well as provides protection to internal circuits & components

INTRODUCTION : 
VIRDI’S Electroplating Rectifier is an economical and most efficient method of obtaining D.C. from A.C. supply by anodizing and many other electro-chemical processes. The widest applications in the field of electro-plating normally requires maximum voltage of 8V, 12V, 16V and 20V D.C. at various current capacities as per requirement. A range of current rating from 50 to 5000 amps is covered in our regular range.(Other ranges available on specific order)

VIRDI'S RECTIFIER FOR RECTIFIER FOR :

ELECTROPLATING
BARRELLING
ANODISING
ETCHING
CLEANING & OTHER ELECTROCHEMICAL PROCESSES

Active power used in KWH = VICOS Ø 
Where V - Voltage I - Current drawn Ø - Angle between voltage & current. 
The cos Ø is defined as power factor. As the maximum value of cos Ø is 1, maximum value of power factor would be 1. With low power factor, any electrical system draws more current for same power. Electrical authority imposes penalty, if power factor is less than a minimum standard.